Saturday, May 30, 2020

27 may 2020

On this night I decided to point the scope along the meridian line to the north. I wanted not to go over the same area of sky I covered in previous nights, and so as not to disturb sleeping family or neighbors, to keep the slewing motion, and motor sounds, to a minimum. I wrapped up the Argo Navis in a jacket to muffle its beeps -- though at the end of the night the unit was overly warm -- will have to turn off the LCD heater so I don't damage the unit this way. There were roof currents (since I was pointed over my own house, so I started out with the 8-inch mask until the seeing improved..

A 1362: 203; 333x: A is light orange, but B only reveals itself with averted vision since it's closer to the primary
13H 29M 03.27S +56° 13' 59.6" P.A. 112 SEP 3.5 MAG 7.68,10.86 SP K0III DIST. 264.55 PC (862.96 L.Y.)

BEM 6 AB: 203; 333x: Faint, one delta mag, wide, easier to see B when its in the side of field or scope is moving.
13H 33M 45.06S +54° 18' 04.2" P.A. 190 SEP 8.3 MAG 10.43,11.19

AG 190 AB: 203; 333x: White pair, tight ~2", need seeing to settle before it sharpens
13H 35M 38.82S +49° 39' 21.7" P.A. 13 SEP 2.6 MAG 9.56,9.82 SP K0

BU 934 AB: 203; 333x: Faint, noticeable magnitude difference, hazy split with seeing
13H 37M 39.37S +50° 28' 28.4" P.A. 265 SEP 1.3 MAG 10.70,10.77 SP G0

STF 1770 AB: 203; 333x: Light orange stars, two delta mag, ~1.5" nicely separated. Physical
13H 37M 42.92S +50° 42' 53.5" P.A. 128 SEP 1.8 MAG 6.93,8.18 SP K3III: DIST. 434.78 PC (1418.25 L.Y.)

BU 802: AB; 203; 333x: Very tough, B appears very briefly in perfect stillness as a very small fine point, outside of A's first diffraction ring, but disappears quickly
13H 48M 36.15S +48° 21' 23.6" P.A. 225 SEP 4 MAG 7.56,11.78 SP A8IV DIST. 117.23 PC (382.4 L.Y.)

A 1614 AB: 203; 333x: Close pair, slight magnitude difference, ~2". Physical with 205 year period
13H 57M 40.26S +51° 59' 37.2" P.A. 298.8 SEP 1.4 MAG 8.99,9.13 SP G5 DIST. 52.85 PC (172.4 L.Y.)

STF 1795 AB: 203; 333x: ! Very beautiful pair. A is blue-white and B shines as if by reflected light, not of its own brightness. B is a very fine point well separated ~8", ~3 delta mag
13H 58M 55.41S +53° 06' 23.2" P.A. 2 SEP 7.9 MAG 6.91,9.83 SP A3IV-V DIST. 156.49 PC (510.47 L.Y.)

A 1097 AB: 203; 533x: Notched elongation, near equal, light orange. Plus one not far away (STF 1800 AB-C)
14H 02M 00.60S +57° 13' 28.6" P.A. 258.6 SEP 0.42 MAG 9.09,8.24 SP F5 DIST. 146.63 PC (478.31 L.Y.)

LDS2700 AB: 203; 333x: wide equal magnitude, physical. Did not see close pair (HDS 1980 Aa-Ab, 9.76/11.45 1.4")
14H 06M 46.34S +59° 46' 16.9" P.A. 150 SEP 49 MAG 9.77,9.30 SP F5 DIST. 101.52 PC (331.16 L.Y.)

STF 1820 AB: 203; 333x: Slightly orange, slight magnitude difference, wide ~3" separation
14H 13M 00.76S +55° 19' 31.1" P.A. 123 SEP 2.8 MAG 9.06,9.42 SP K2 DIST. 38.26 PC (124.8 L.Y.)

STF 1831 AB: 203; 333x: Quite the system, septuple. AB has a nice mag difference and is well separated, an attractive pair. Physical. The C component, which is 6.73, appears red to me
14H 16M 08.47S +56° 42' 45.7" P.A. 138 SEP 5.8 MAG 7.16,9.56 SP A7IV DIST. 156.01 PC (508.9 L.Y.)

STF 1821 AB: 203; 333x: Kap2 Boo, Asellus Tertius. Bright pair, light yellow A and very slightly blue B, wide separation, ~2 delta mag.
14H 13M 29.00S +51° 47' 23.8" P.A. 236 SEP 13.7 MAG 4.53,6.62 SP A7V+F1V DIST. 50.1 PC (163.43 L.Y.)

STF 1829 AB: 203; 205x: Very light yellow A and slightly blue B, wide, ~1 delta mag, physical
14H 15M 27.95S +50° 26' 24.6" P.A. 151 SEP 5.6 MAG 8.10,8.63 SP F5 DIST. 160.51 PC (523.58 L.Y.)

A 1616 AB: 203; 205: Near equal, can just split, very tight
14H 16M 01.20S +52° 47' 10.7" P.A. 85 SEP 1.7 MAG 10.27,10.53 SP G5

BU 1271 AB: 203; 333x: A is relatively bright, B star flashes out with averted vision, very tight split, physical
14H 17M 03.92S +54° 32' 34.8" P.A. 354 SEP 1.6 MAG 7.10,12.30 SP G1IV DIST. 55.96 PC (182.54 L.Y.)

A 147 AB: 203; 667x: Suspected at 333x, hazy notched elongation at 667x but seeing is not good enough to focus cleanly
14H 17M 03.03S +50° 59' 45.2" P.A. 109 SEP 0.7 MAG 8.78,10.08 SP G5 DIST. 78.37 PC (255.64 L.Y.)

BU 1272 AB: 203; 333x: Just barely split with seeing, very fine, slight magnitude difference, ~1"
14H 17M 47.55S +48° 45' 10.3" P.A. 138 SEP 1.3 MAG 9.47,10.38 SP A2

STF 1834 AB: 203; 333x: Near equal white, nicely separated. Physical with 431 year period
14H 20M 17.60S +48° 30' 25.1" P.A. 103.5 SEP 1.62 MAG 8.09,8.29 SP F9V DIST. 75.36 PC (245.82 L.Y.)

STF 1839 AB: 203; 333x: Wide pair, near equal, A is a little blue and B slightly red. Physical
14H 21M 27.38S +53° 53' 50.9" P.A. 83 SEP 14.5 MAG 8.84,8.92 SP G0 DIST. 178.89 PC (583.54 L.Y.)

A 148 AB: 203; 333x: Notched elongation or overlapping disks on a small scale, white stars
14H 22M 01.20S +51° 06' 40.3" P.A. 192 SEP 0.5 MAG 8.32,8.96 SP F5 DIST. 123.15 PC (401.72 L.Y.)

BU 615 AB: 203; 333x: B is averted vision only, surprisingly tough, tight split.
14H 22M 14.90S +48° 31' 31.5" P.A. 235 SEP 3 MAG 9.60,10.60 SP K0

ES 961 AB: 203; 333x: Wide pair, almost one delta mag, faint
14H 31M 08.99S +48° 07' 30.5" P.A. 320 SEP 6.6 MAG 10.71,11.00

STF 1863 AB: 203; 333x: Hairline split with seeing, slight mag difference, white. Physical with 538 year period.
14H 38M 00.71S +51° 34' 42.1" P.A. 59.3 SEP 0.65 MAG 7.71,7.80 SP F4V DIST. 82.17 PC (268.04 L.Y.)

STT 284 AB: 203; 333x: B revealed by averted vision, well separated from A, faint. Physical
14H 40M 16.76S +48° 42' 32.4" P.A. 103 SEP 7.2 MAG 7.91,11.56 SP F0 DIST. 106.72 PC (348.12 L.Y.)

A 1623 AB: 203; 333x: ! Very fine sight. B revealed by foveal coaxing (switching between averted and direct vision, slowly moving the averted vision target closer to the primary) and it appeared as a direct vision point close but well separated, significant mag difference. A is yellow, B is light orange
14H 41M 20.66S +52° 38' 49.3" P.A. 241 SEP 1.9 MAG 8.65,11.23 SP F8 DIST. 84.39 PC (275.28 L.Y.)

STF 1871 AB: 203; 333x: Close near equal white stars, nicely separated
14H 41M 35.50S +51° 23' 51.3" P.A. 313 SEP 1.9 MAG 8.02,8.07 SP F3V DIST. 99.3 PC (323.92 L.Y.)

ES 962 AB: 203; 333x: B revealed easily with averted vision, and lingers for a short time before disappearing again, well separated.
14H 43M 51.22S +47° 43' 02.8" P.A. 263 SEP 10.7 MAG 8.70,11.30 SP G0

STF 1889 AB: 203; 333x: Pretty light yellow A and ~3 delta mag blue B, wide separation. Not physical
14H 49M 32.37S +51° 22' 28.2" P.A. 93 SEP 15.1 MAG 6.53,9.64 SP F3V DIST. 57.11 PC (186.29 L.Y.)

STF 1890 AB: 203; 333x: 39 Boo. White ~1 delta mag, ~2.5", nice pair showing good disks
14H 49M 41.37S +48° 43' 15.6" P.A. 46 SEP 2.6 MAG 6.31,6.67 SP F6V+F5V DIST. 68.59 PC (223.74 L.Y.)

A 1625 AB: 203; 333x: Nice near equal, faint, close ~3", bluish. Plus one pairing is ~1 mag fainter and farther out. CD not seen as it's 14th mag, would be good from a dark site
14H 54M 04.85S +52° 17' 46.2" P.A. 117 SEP 3.6 MAG 10.29,10.54 SP F8 DIST. 305.81 PC (997.55 L.Y.)

A 1137 AB: 203; 333x: Very tough. B appeared very briefly with best seeing as a tiny point split from A, but quickly taken back by diffraction
16H 19M 14.26S +57° 35' 56.3" P.A. 204 SEP 0.6 MAG 9.16,9.76 SP A3

ES 1793 AB: 203; 333x: Wide, ~3 delta mag, white and dull white. Physical
16H 12M 35.11S +57° 47' 42.0" P.A. 57 SEP 5.8 MAG 8.74,11.52 SP F8 DIST. 119.9 PC (391.11 L.Y.)

ES 2651 AB: 203; 333x: Quite wide separation and ~3 delta mag, white A and dull blue B. Physical
16H 09M 02.89S +57° 56' 16.3" P.A. 140 SEP 12.3 MAG 6.33,12.14 SP A1V DIST. 123.61 PC (403.22 L.Y.)

HU 154 AB: 203; 333x: Fine pair when seeing sharpens, blue-white A and bluish B, ~1" separation. Physical
16H 00M 21.25S +54° 31' 21.2" P.A. 298 SEP 1.4 MAG 7.89,10.85 SP A0 DIST. 134.77 PC (439.62 L.Y.)

STF 2006 AB: 203; 333x: Really fine when seeing sharpens, white A and blue B, ~1.5" separation
16H 00M 18.28S +58° 56' 03.0" P.A. 177 SEP 1.5 MAG 8.48,9.96 SP A3 DIST. 206.19 PC (672.59 L.Y.)

TDS9392 AB: 508; 333x: B revealed by foveal coaxing, very faint and very close in
15H 04M 27.46S +53° 50' 22.2" P.A. 290 SEP 1.1 MAG 11.21,12.24

STT 294 AB: 508; 333x: Bright white A, and B is faint but seen direct vision, seems reddish color, well separated, ~4 delta mag
15H 12M 57.91S +56° 02' 47.2" P.A. 244 SEP 3 MAG 7.55,11.26 SP A4III DIST. 119.62 PC (390.2 L.Y.)

ES 740 AB: AB 508; 333x: Pretty pair, dull white, ~1 delta mag, ~3-4" separation
15H 18M 43.18S +53° 33' 38.7" P.A. 38 SEP 3.5 MAG 10.20,10.70 SP G5

ES 741 AB: 508; 333x: More than one delta mag, wide ~9" separation
15H 19M 49.78S +52° 44' 51.2" P.A. 235 SEP 8.9 MAG 9.78,11.80 SP F8

HU 147 AB: 508; 667x: Very brief split with seeing when points resolve, seeing making it hazy otherwise. Nice.
15H 20M 22.11S +53° 08' 52.4" P.A. 287 SEP 0.6 MAG 10.28,10.30 SP K0 DIST. 119.47 PC (389.71 L.Y.)

HU 148 AB: 508; 333x: Split, though hazy, ~1.5", significant magnitude difference
15H 22M 28.30S +55° 16' 19.9" P.A. 207 SEP 1.5 MAG 9.42,10.76 SP G0

HU 149 AB: 508; 333x: Awesome hairline split, near equal, light yellow-orange. Great pair, physical
15H 24M 35.30S +54° 12' 46.1" P.A. 270.4 SEP 0.65 MAG 7.48,7.62 SP K0 DIST. 234.74 PC (765.72 L.Y.)

STF 1948 AB: 508; 333x: Bright white wide pair, ~1 delta mag. Physical
15H 26M 34.86S +54° 53' 56.5" P.A. 48 SEP 12.9 MAG 8.71,9.65 SP A5 DIST. 127.71 PC (416.59 L.Y.)

A 1124 AB: 508; 333x: Nicely split close pair, ~1 delta mag, light yellow-white stars
15H 36M 05.00S +55° 31' 19.6" P.A. 143 SEP 1.5 MAG 9.24,9.60 SP F8 DIST. 165.02 PC (538.3 L.Y.)

STF 1969 AB: 508; 333x: Split pretty well, though close, slight mag difference, light yellow-white. Physical 434 year period
15H 41M 16.41S +59° 59' 17.2" P.A. 29.3 SEP 1.1 MAG 9.14,9.50 SP K0 DIST. 55.65 PC (181.53 L.Y.)

STF 2060 AB: 508; 333x: Near equal white, well split ~4". Not physical
16H 28M 32.06S +56° 44' 07.9" P.A. 247 SEP 3.8 MAG 10.19,10.26 SP G5 DIST. 307.69 PC (1003.68 L.Y.)

26 may 2020

This was another long night of observing, from 10pm to 1am, with many objects found. I set up my 6-inch f5 for some sweeping, with a higher tripod, but I found that the movements are just too rough to continue with it, so I decided to buy a true alt-az mount. The night was warm with light dew, and just a joy to be out.

BU 924 AB: 508; 333x: 31 Vir. Bright white A and slightly red B, large mag difference, ~2.3" separation
12H 41M 57.16S +06° 48' 23.9" P.A. 40 SEP 4.1 MAG 5.57,10.10 SP A2V DIST. 71.53 PC (233.33 L.Y.)

HO 54 BC: 508; 333x: AB is bright yellow white, and B is far separated 15", but B is also a pair of near equal 10th mag stars, ~2" separated
12H 41M 55.93S +09° 52' 46.9" P.A. 141 SEP 2.3 MAG 11.80,11.80

A 1782 AB: 508; 333x: Very fine reddish stars, large delta mag, B visible direct vision. ~2" separation, ~4 delta mag. It's part of a string of brighter seventh and eighth magnitude stars.
12H 41M 50.16S +07° 23' 48.8" P.A. 135 SEP 1.9 MAG 10.02,11.91 SP K5 DIST. 84.6 PC (275.97 L.Y.)

STF 1668 AB: 508; 333x: White near equal, >1" separated, nice
12H 40M 54.13S +08° 49' 45.2" P.A. 187 SEP 1.1 MAG 7.78,8.10 SP F5V DIST. 121.07 PC (394.93 L.Y.)

A 1602 AB: 508; 1067x: Yes! B resolves with seeing, well split, ~0.5", orange stars. Very nice
12H 42M 55.41S +05° 15' 59.9" P.A. 26.3 SEP 0.62 MAG 8.77,10.12 SP G5 DIST. 92.51 PC (301.77 L.Y.)

A 2488 AB: 508; 333x: White A red B, well separated ~5", three delta mag
12H 43M 37.02S +02° 09' 48.2" P.A. 191 SEP 4.6 MAG 8.74,12.30 SP F8 DIST. 303.95 PC (991.48 L.Y.)

A 1603 AB: 508; 333x: Very fine white and slightly red stars, ~3 delta or more, ~1" separation. In an arc of five stars, pretty
12H 43M 58.88S +03° 55' 56.6" P.A. 129 SEP 1.2 MAG 9.06,11.60 SP F5

STF 1674 AB: 508' 333x: Light yellow A and a bit deeper yellow B, close, ~2 delta mag.
12H 43M 47.85S +07° 33' 30.0" P.A. 173 SEP 2.3 MAG 8.77,9.32 SP G0 DIST. 199.6 PC (651.1 L.Y.)

J 432 AB: 508; 333x: Yellow-white stars, 1 delta mag, ~1" separation, nice well split
12H 45M 21.08S +03° 31' 28.0" P.A. 251 SEP 0.9 MAG 9.04,9.77 SP F8 DIST. 157.48 PC (513.7 L.Y.)

HU 893 AB: 508; 333x: Light yellow stars, noticeable mag difference, ~1.5"
12H 47M 58.12S +12° 17' 08.5" P.A. 33 SEP 1.5 MAG 10.58,10.85 SP F4

HLD 117 AB: 508; 333x: Dual tenth mag stars, slight mag difference, wide ~2-3" suspect galaxies in area
12H 49M 09.57S +07° 38' 16.3" P.A. 21 SEP 2.5 MAG 10.26,10.60 SP F8

BU 459 AB: 508; 333x: Light yellow A and ~3 delta mag B, wide ~3"
12H 48M 04.02S +03° 27' 19.1" P.A. 295 SEP 5.4 MAG 8.06,11.05 SP F5 DIST. 187.97 PC (613.16 L.Y.)

HU 894 AB: 508; 333x: Very nice near equal white pair, well separated ~1"
12H 53M 18.76S +13° 09' 55.8" P.A. 143 SEP 1.2 MAG 9.78,9.87 SP G5 DIST. 268.82 PC (876.89 L.Y.)

STF 1693 AB: 508; 333x: Equal white, wide separation
12H 56M 40.32S +07° 01' 11.8" P.A. 332 SEP 8.7 MAG 9.88,10.51 SP G DIST. 139.08 PC (453.68 L.Y.)

FIN 380 AB: 508; 1067x apodizing mask: !! Notched overlapping disks, orange-yellow equal stars. This should be added to the short period list since it is quickly closing. Glad I caught it now, just before it becomes impossible
12H 57M 13.62S +08° 17' 37.5" P.A. 163.2 SEP 0.18 MAG 7.50,7.88 SP F5 DIST. 101.73 PC (331.84 L.Y.)grafico orbita
STT 270 AB: 203; 667x: Tau Boo. Brief glimpses of B well separated from A on outside of diffraction using the 8-inch mask mask. Higher magnifications and full aperture had too much diffraction. The A star is yellow-orange but I could not get a sense of any color of B, other than being about the same color as A
13H 47M 15.74S +17° 27' 24.8" P.A. 78.9 SEP 1.37 MAG 4.50,11.10 SP F6IV+M2V DIST. 15.62 PC (50.95 L.Y.)grafico orbita
A 2063 AB: 508; 1067x: I sense elongation or peanut at 667x & 1067x, but very tentative.
13H 46M 31.47S +15° 45' 04.9" P.A. 137 SEP 0.2 MAG 9.55,9.85 SP F8 DIST. 219.78 PC (716.92 L.Y.)

J 1125 AB: 508; 667x: A bit of a haze surrounding it, so the images are not sharp, but I see two bright glows within it at the correct <1" separation, more than one delta mag
14H 12M 09.32S +27° 21' 59.1" P.A. 97 SEP 0.7 MAG 10.37,10.68 SP G0

COU 480 AB: 508; 333x: B very faint, but can see it at best focus & with seeing, a little red color, ~2" separation
14H 12M 43.27S +25° 46' 52.9" P.A. 73 SEP 2 MAG 9.90,12.40 SP F5

POU3163 AB: 508; 333x: Wide separation, noticeable mag difference, likely part of plus one as there's another 11th mag forming a long triangle with the closer pair
14H 13M 30.83S +24° 32' 56.7" P.A. 279 SEP 47.5 MAG 11.00,13.25

ROE 74 AB: 508; 333x: Pretty close magnitudes, wide, nice light white-blue stars. Not physical
14H 15M 39.01S +22° 54' 45.3" P.A. 287 SEP 7.1 MAG 11.70,12.20

STF 3083 AB: 508; 333x: Attractive pair, blue-white A and rusty B, fairly wide.
14H 19M 40.85S +23° 30' 16.2" P.A. 233 SEP 4.8 MAG 9.03,10.98 SP G0 DIST. 118.91 PC (387.88 L.Y.)

POU3169 AB: 508; 333x: Both quite faint, needed averted vision for B, so they are unequal magnitude, wide ~5"
14H 20M 26.46S +24° 12' 04.6" P.A. 304 SEP 5.4 MAG 12.31,13.40

COU 403 AB: B flashes out with averted vison only, ~4" separated. Not physical
14H 21M 33.91S +26° 03' 52.3" P.A. 38 SEP 3.9 MAG 10.66,12.60 SP K0

STF 1866 AB: 508; 333x: Nice dual yellow-white stars, near equal, nicely split.
14H 41M 44.64S +09° 31' 39.4" P.A. 205 SEP 0.7 MAG 8.48,8.65 SP G5 DIST. 456.62 PC (1489.49 L.Y.)

HEI 533 AB: 508; 333x: Faint bluish colors, B visible when the scope moves, widely separated.
14H 42M 39.31S +11° 57' 06.4" P.A. 43 SEP 1.9 MAG 11.05,11.80

STF 1870 AB: 508; 333x: Very pretty light yellow A and light orange B, ~2 delta mag, ~4" separation
14H 42M 55.10S +08° 04' 34.3" P.A. 228 SEP 4.8 MAG 7.46,9.98 SP F2 DIST. 198.02 PC (645.94 L.Y.)

KU 48 AB: 508; 333x: Near equal, wide ~7". Two other stars near by on either side making a shallow arc, likely a system (Quintuple system, physical)
14H 43M 02.28S +13° 09' 55.7" P.A. 138 SEP 6.6 MAG 10.43,10.66 SP K0

HEI 534 AB: 508; 333x: Very fine, split, almost one delta, less than one sep
14H 44M 32.54S +12° 21' 06.1" P.A. 262 SEP 0.6 MAG 11.80,11.90

STF 1879 AB: 508; 333x: Light yellow stars, 1 delta mag, almost 2" separation, in a rich field
14H 46M 15.58S +09° 38' 48.2" P.A. 82.3 SEP 1.72 MAG 7.79,8.45 SP G2V DIST. 43.22 PC (140.98 L.Y.)

A 1110 AB: 508; 333x: Very nice, split with seeing, light yellow stars, slight mag difference
14H 49M 42.18S +07° 59' 12.3" P.A. 244 SEP 0.7 MAG 7.69,7.93 SP F5+F8III DIST. 132.28 PC (431.5 L.Y.)

A 1111 AB: 508; 333x: Very pretty, ~2 delta, ~3" separation. Blue-white and reddish colors. Fine pair
14H 49M 46.75S +10° 17' 43.5" P.A. 297 SEP 3.3 MAG 9.10,11.20 SP K0

LEO 12 AB: 508; 333x: Very nice near equal, well separated ~4"
14H 50M 53.97S +10° 50' 33.8" P.A. 148 SEP 3.4 MAG 11.10,11.30

HEI 781 AB: 508; 333x: Near equal, B is a little dimmer and slightly yellow-white, A is yellow. Very well split ~1.5"
14H 56M 26.61S +08° 41' 58.9" P.A. 218 SEP 1.6 MAG 10.73,10.95 SP G0

PPM 131016 508; 333x: Very delicate. B is visible direct vision but is quite faint, nicely set off from the moderately bright A, ~2.5" separation ** not in WDS.

STF 1960 AB: 508; 333x: Wide pair, 1 delta mag.
15H 36M 35.97S +09° 14' 45.4" P.A. 319 SEP 12.1 MAG 9.96,10.52 SP G5

STT 300 AB: 508; 333x: Pretty canary yellow A and light blue B, wide, ~3 delta mag.
15H 40M 10.35S +12° 03' 10.6" P.A. 261 SEP 15 MAG 6.32,10.07 SP G7.5IIIA DIST. 286.53 PC (934.66 L.Y.)

A 2076 AB: 508; 333x: Tight white near equal pair, <1" separation. Physical with a 770 year period
15H 40M 28.45S +18° 40' 18.0" P.A. 186.1 SEP 0.73 MAG 8.28,8.44 SP A2 DIST. 309.6 PC (1009.92 L.Y.)

BU 619 AB: 508; 533x: Clean split when seeing settles, ~1 delta mag, light orange A and light blue B. (Need to reobserve this one; BC is 8.3/9.5 0.3")
15H 43M 10.53S +13° 40' 03.7" SEP 0.6 MAG 6.95,7.94 SP G4IV DIST. 173.31 PC (565.34 L.Y.)

ROE 75 AB: 508; 333x: Nice pair, ~2 delta mag, wide. white. Physical
15H 44M 21.80S +15° 17' 59.0" P.A. 327 SEP 6 MAG 8.23,10.68 SP G0 DIST. 46.27 PC (150.93 L.Y.)

HEI 238 AB: 508; 333x: Equal faint stars, just split in finest moments, some haze about them
15H 46M 15.54S +16° 13' 41.2" P.A. 143 SEP 1.2 MAG 11.40,11.60 SP F5

COU 67 AB: 508; 333x: Dual 11th mag stars, very nicely resolved, blue
15H 54M 00.28S +19° 35' 49.6" P.A. 218 SEP 1.6 MAG 10.99,11.07

BRT1941 AB: 508; 333x: Faint but pretty well split, ~4", noticeable mag difference
15H 55M 36.70S +17° 26' 29.6" P.A. 321 SEP 3.4 MAG 10.50,11.50

STF 1988 AB: 508; 333x: Near equal pair, blazing white, ~2"
15H 56M 45.53S +12° 28' 40.6" P.A. 249 SEP 1.8 MAG 7.59,7.84 SP F1V DIST. 96.25 PC (313.97 L.Y.)

BRT2422 AB: 508; 333x: Orange A and blue B, slight magnitude difference, wide ~5". Nice pair -- but not physical
15H 57M 46.41S +17° 36' 44.3" P.A. 180 SEP 4.5 MAG 10.50,10.80

ALD 3 AB: 508; 333x: Split with seeing, averted vision to brighten the stars up more
15H 57M 23.17S +15° 26' 05.8" P.A. 30 SEP 1.7 MAG 10.56,10.00

STF 1990 BC: 508; 333x: BC is near equal white ~3" separation. Part of a quadruple system -- that's not physical!
15H 58M 56.87S +21° 47' 54.8" P.A. 25 SEP 4 MAG 9.25,9.29 SP A2 DIST. 162.34 PC (529.55 L.Y.)

STT 303 AB; 508; 333x: Nice white pair, slight mag difference, ~4" separation. Physical with 1460 year period
16H 00M 54.16S +13° 16' 18.2" P.A. 174.1 SEP 1.61 MAG 7.69,8.06 SP F7V DIST. 97.28 PC (317.33 L.Y.)

STF 2000 AB: 508; 333x: Nice white pair, slight mag difference, ~3" separation
16H 03M 02.17S +13° 59' 28.8" P.A. 228 SEP 2.6 MAG 8.42,9.22 SP F2 DIST. 200 PC (652.4 L.Y.)

STF 2003 AB: 508; 333x: ! Really great yellow A and blue B pair, wide, ~2 delta mag. Striking. physical
16H 03M 39.61S +11° 26' 00.8" P.A. 170 SEP 14.2 MAG 7.27,10.47 SP K3III DIST. 132.8 PC (433.19 L.Y.)

HEI 385 AB: 508; 333x: Very fine, unassuming pair, bluish, ~2" separation
16H 09M 23.26S +13° 04' 15.9" P.A. 8 SEP 1.9 MAG 11.07,11.31

A 1116 AB: 508; 333x: Near equal white, nicely split, <1"
15H 11M 38.29S +10° 07' 29.7" P.A. 53 SEP 0.8 MAG 8.84,8.63 SP A9V DIST. 225.73 PC (736.33 L.Y.)

BRT1940 AB: 508; 333x: Slight magnitude difference, B just visible direct, ~4" separation
15H 11M 42.45S +10° 53' 37.5" P.A. 167 SEP 3.1 MAG 10.40,11.60

COU 189 AB: 508; 1067x: FL Ser. I get elongation only at all powers up to 1067x, no notches. Light orange stars
15H 12M 04.27S +18° 58' 33.7" P.A. 140 SEP 0.4 MAG 6.16,8.94 SP M4IIIAB DIST. 221.73 PC (723.28 L.Y.)

STF 1940 AB: 508; 667x: ! Hairline split with seeing, slight magnitude difference, light orange stars
15H 26M 08.92S +18° 10' 16.2" P.A. 332 SEP 0.3 MAG 8.46,8.88 SP F8 DIST. 263.85 PC (860.68 L.Y.)

HO 549 BC: 508; 333x: Very finely split, faint, really challenging at tis magnification. AB is bright white star A, very wide
15H 31M 50.89S +14° 03' 39.2" P.A. 241 SEP 0.9 MAG 11.08,11.30

A 2075 AB: 508; 333x: ! Barely split, with seeing. B appears as a head separated from the snowman, significant mag difference. bluish stars. Very fine
15H 31M 51.90S +16° 23' 08.9" P.A. 95 SEP 0.5 MAG 9.30,10.10 SP F5

LEO 33 AB: 508; 333x: Tight near equal white stars, ~1.5" separation
15H 35M 11.73S +14° 55' 10.1" P.A. 261 SEP 1.5 MAG 10.46,10.46

STF 1957 AB: 508; 1067x: Lumpy out of roundness, very subtle notch if any.
15H 35M 51.05S +12° 54' 58.7" P.A. 135 SEP 0.3 MAG 7.96,9.43 SP F8 DIST. 68.26 PC (222.66 L.Y.)

Friday, May 29, 2020

25 may 2020

Seeing was significantly better than the night before.  I could tell from the first target it was a good night.  After observing a couple stars off my regular list, I switched to the Short Period list -- and I'm glad I did.  I made some of the best observations I've ever had.

As planned I started around 10pm and pointed south, in Virgo.  Then shortly after 11pm I pointed north, to Cvn and Ursa Major.  Afterwards I kept on the meridian line and worked across Bo├Âtes and then crossed over into Draco.

I tired out a little earlier than the night before, and closed the observatory at 1am.  I had my 6-inch f/5 refractor set-up, and did some Milky Way sweeping, trying to find various Messiers (M57 was seen and rather bright with averted vision; M13, M92, M24, M11.  Had a very photographic view of Albireo.  I'm really glad I bought the Droptix, it helps with low power views a lot.  My mount is unusable, I'm afraid -- too rough and choppy.  I am searching for a replacement.

STF 1711 AB: 508; 667x: Hairline split at 533x, easy split at 667x.  Light orange stars, noticeable magnitude difference.  Struve discovered at 1.4"
13H 02M 51.05S +13° 28' 24.2" P.A. 329.8 SEP 0.32 MAG 9.27,9.36 SP F5 DIST. 79.55 PC (259.49 L.Y.)

STF 1712  AB: 508; 333x: white stars, wide, near equal
13H 03M 32.39S +09° 28' 08.0" P.A. 332 SEP 9.1 MAG 10.24,10.57 SP G0+G0 DIST. 97.37 PC (317.62 L.Y.)

STF 1716 AB: 508; 333x: A is a bright light yellow, B is a richer yellow, but two delta mag, wide, ~4"
13H 04M 30.74S +08° 39' 11.5" P.A. 150 SEP 2.9 MAG 8.32,10.53 SP F0 DIST. 174.52 PC (569.28 L.Y.)

J 2103 AB: 508; 333x: Easy, fairly wide yellowish stars, B a little more yellow, ~1 delta mag
13H 05M 00.78S +13° 04' 09.7" P.A. 200 SEP 3.2 MAG 10.60,10.90 SP F8

HU 1143 AB: 508; 333x: Very nice pair, ~1 delta mag, close ~1" separation, slightly yellow stars.
13H 06M 24.89S +11° 55' 39.7" P.A. 94 SEP 1.1 MAG 11.06,11.21 SP F5

STF 1670 AB: 508; 333x: Short Period. Porrima.  Blazing white stars, easy.  I noted their orientation in a sketch.  It will continue to widen.


RST 5524 AB: 508; 1067x: Short Period. With apodizing mask.  Overlapping disks at best moments, orange and blue stars, slight magnitude difference.  Discovered in 1951 also at 0.2".  It will continue to narrow in the coming years
11H 44M 04.12S -04° 48' 25.8" P.A. 191.8 SEP 0.21 MAG 8.90,8.90 SP F4V DIST. 135.69 PC (442.62 L.Y.)

508; 1067x: Iota Vir, Syrma  !! Blue and red! Overlapping disks, blue in front / bottom and red behind it. Clear notching.  Some diffraction but clear.  No other stars in view.  Color not so vivid, pale blue/red.  Notched elongation.  Check spectra.  -- For this one it's not in WDS and I can't understand what I saw, so this is a tentative observation.  Did I really see HD 125354  instead? 14 18 58.2664803479 -06 36 12.972559818


HU 644 AB: 508; 667x: !! Beautiful! Orange star with faintest bluish dot on the inside of first diffraction, hairline at best moments.  One of the most beautiful I've seen.
13H 19M 45.58S +47° 46' 41.1" P.A. 325.8 SEP 0.11 0.318" MAG 9.11,9.87 SP M2V DIST. 10.71 PC (34.94 L.Y.)
The orbital plot is incorrect; the current separation is 0.318"

A 1609 AB: 508; 1067x, ap mask: Notched at best moments, white stars, none other in view.  This one will narrow and flip orientation over the next 10 years, so it will be difficult to tell A from B then.  When 90 degrees from now it will be 0.15"
13H 25M 48.12S +44° 29' 38.3" P.A. 76 SEP 0.29 MAG 9.49,8.79 SP K0 DIST. 52.66 PC (171.78 L.Y.)


STT 269 AB: 508; 667x: Overlapping disks.  ~1 delta mag.  Barely hairline at best moments.
13H 32M 51.02S +34° 54' 25.8" P.A. 227.1 SEP 0.3 MAG 7.27,8.08 SP A6III DIST. 147.93 PC (482.55 L.Y.)


STF 1909 AB: 508; 667x: 44 Boo. Notched elongation, light orange stars.  533x cleaner disks than 667x and I can still see the notches and the elongation orientation, and three other stars in the field for me to record their positions.
15H 03M 47.30S +47° 39' 14.6" P.A. 90.7 SEP 0.39 MAG 5.20,6.10 SP F7V+K4V DIST. 12.51 PC (40.81 L.Y.)

ES 964 AB: 508; 333x: Near equal white, wide ~6"
15H 38M 26.39S +52° 34' 18.2" P.A. 219 SEP 5.3 MAG 10.57,10.80 SP K2

TDS9574 AB: 508; 667x: Near a bright star.  Tough one, focus not quite good enough to tighten the haze which clearly is two stars, <1" separation
15H 38M 51.43S +50° 27' 15.9" P.A. 176 SEP 0.8 MAG 11.57,11.81

TDS9608 AB: 508; 333x: ! Extremely fine, I can get it at 333x with direct vision, B appears with seeing as a small point less than 1", ~1 delta mag.
15H 44M 10.54S +52° 12' 33.2" P.A. 84 SEP 0.7 MAG 10.78,11.25

HU 657 AB: 508; 333x: !! So good.  With precise focus and steady seeing two near equal stars split, steady.
15H 45M 40.74S +50° 40' 20.8" P.A. 175.1 SEP 0.52 MAG 10.25,10.95 SP K0 DIST. 141.44 PC (461.38 L.Y.)

COU 2388 AB: 508; 1067x: !! Notched at 667x, barely hairline at 1067x with seeing
15H 46M 28.21S +50° 47' 59.8" P.A. 219 SEP 0.2 MAG 9.61,9.72 SP K0 DIST. 60.42 PC (197.09 L.Y.)

HU 152 AB: 508; 333x: Sweet pair, ~3 delta mag, a well separated 3".  B slightly blue, A very white.  nice pair.
15H 46M 57.24S +51° 58' 46.7" P.A. 244 SEP 3.9 MAG 8.46,11.31 SP F8 DIST. 113.12 PC (369 L.Y.)

ES 742 AB: 508; 333x: Near equal white stars, well separated almost 4"
15H 46M 57.65S +53° 37' 17.5" P.A. 83 SEP 3.5 MAG 9.98,10.35 SP G0

BU 946 AB: 508; 333x: B is a neat little point ~2" separated from very bright white A
15H 47M 37.92S +55° 22' 35.9" P.A. 129 SEP 2.3 MAG 5.91,9.53 SP A3M DIST. 73.8 PC (240.74 L.Y.)

STF 1948 AB: 508; 333x: Pretty light yellow stars, more than 2 delta, ~7" separation
15H 51M 10.09S +52° 54' 25.2" P.A. 280 SEP 6.4 MAG 6.89,8.94 SP A1V DIST. 127.06 PC (414.47 L.Y.)

AG 199 AB: 508; 333x: Wide near equal white stars. 
15H 52M 00.35S +52° 33' 54.6" P.A. 254 SEP 9.6 MAG 9.46,9.71 SP F2 DIST. 206.61 PC (673.96 L.Y.)

HDS2126 AB; 508; 667x: ! Wow.  At best focus and seeing, clean well split, more than one delta, very fine pair
15H 06M 10.47S +52° 24' 55.4" P.A. 294 SEP 0.6 MAG 11.18,11.01 SP G9 DIST. 120.48 PC (393.01 L.Y.)

ES 774 AB: 508; 333x: White stars, near equal, wide ~3" clean pair.
15H 07M 33.24S +50° 56' 01.6" P.A. 230 SEP 3.4 MAG 10.53,10.92 SP G0

COU1761 AB: 508; 333x: Nice, very fine near equal 11th magnitude pair, well split
15H 07M 42.04S +46° 33' 03.8" P.A. 267 SEP 1.2 MAG 11.38,11.55

TDS9416 AB: 667x: ! difficult. With finest focus, A is a round white pint, I need averted vision to show the B star which is exceedingly close, but separated from A.  Lucky A is not too bright and there's little diffraction
15H 09M 08.26S +51° 11' 19.2" P.A. 211 SEP 0.5 MAG 11.39,11.64

MLR 635 AB: 508; 333x: Fine 11th magnitude pair, near equal white, ~2" separation, nice
15H 13M 30.89S +54° 01' 52.9" P.A. 127 SEP 2.2 MAG 11.04,11.14

HU 145 AB: 508; 333x: Very pretty white and blue stars, B can be detected and held with direct vision
15H 14M 07.13S +52° 35' 18.6" P.A. 132 SEP 2 MAG 10.06,12.17 SP A5 DIST. 249.38 PC (813.48 L.Y.)

ES 775 AB: 508; 333x: Nice blue-white stars, slight magnitude difference, wide ~7"
15H 14M 49.98S +50° 47' 38.8" P.A. 221 SEP 6.7 MAG 10.90,11.10

BEM 18 AB: 508; 333x: ~1 delta mag, wide. Physical
15H 18M 36.13S +51° 58' 58.3" P.A. 13 SEP 8.6 MAG 10.30,12.00

TDS9521 AB: 508; 333x: Faint, but direct vision pair, half delta mag, wide ~3". Not physical
15H 27M 07.44S +51° 26' 53.9" P.A. 138 SEP 3.3 MAG 11.87,12.40

HU 652 AB: 508; 333x: ! beautiful pair, ~1 delta, very close ~1" separation.  Nice pair
15H 36M 06.19S +48° 48' 57.0" P.A. 186 SEP 1.2 MAG 9.25,9.58 SP F8 DIST. 145.35 PC (474.13 L.Y.)

COU 2109 AB: 508; 333x: Lovely white stars, ~1 delta mag, a little more than 1" separation
15H 36M 30.91S +49° 51' 00.4" P.A. 89 SEP 1.4 MAG 10.22,11.17 SP K0

HDS 2203: 508; 1067x: Out of round elongation only, but no resolution
15H 37M 55.38S +50° 04' 55.8" P.A. 128.3 SEP 0.15 MAG 8.03,9.84 SP G0 DIST. 46.45 PC (151.52 L.Y.)

TDS9568 AB: 508; 667x: B visible with averted vision only, extremely close but split with seeing only, it's a smudge otherwise
15H 37M 58.17S +52° 31' 47.1" P.A. 246 SEP 0.5 MAG 11.17,11.30

COU2110 Aa-Ab: 508; 667x: Suspect notched 667x, very small scale, near equal stars.  Seeing did not support higher magnification
15H 38M 09.68S +50° 20' 41.2" P.A. 208 SEP 0.3 MAG 10.70,11.10

Thursday, May 28, 2020

24 may 2020

Last night had excellent transparency and good seeing. It was a near new moon too, so under normal times I would have tried to go out. But it's difficult to justify going out, assuming I could find a place to go, when the rest of the family is stuck at home with little to do. So I stayed at home and observed doubles with my 20-inch. The best seeing was forecast to start at 1am, so I tried to rest in the evening and started after 10pm. Transparency was compromised by marine haze which always settles in over the Bay Area -- which is why the higher elevations sites are preferred. Seeing was not especially good and I was getting soft views in the beginning of the night at 533x and above. It did improve later in the night but not significantly. So much time on the ladder made my legs and back feel uncomfortable. I will need to be sure to stretch more and improve my muscle flexibility; spending so long on a ladder can be difficult. I should check into stiff soled shoes, to provide some added support.

I took breaks for snacks and something to drink. The weather was mild throughout. I think roof and other radiation cooling effected the seeing somewhat. My telescope's location means I'm pointed south to meridian and when I observe several nights at a time I end up going over skies I have already picked over, leaving few targets. I don't want to slew my scope too much lest I wake the neighbors with the motor sounds and the clatter of when I reposition my ladder. Tonight is predicted to be very good again -- so before everyone goes to bed I think I'll position the scope to the north and see if it helps me get new targets.

At the end of the night I lay down on my back on the patio, and used binoculars to scan about. Of course it's nothing like a dark site, but the views were really nice. Spotted M13 and M92; tried for M57 but didn't see it. I will bring out my 6" f5 refractor that I've been working on to give it a test drive tonight.

COU55 AB: 508; 533x: Shimmery at this magnification. Averted vision picks out the B star, even though it's only one delta mag, ~2" separation
13H 12M 28.87S +20° 49' 36.1" P.A. 127 SEP 2.4 MAG 9.98,10.80 SP F5 DIST. 117.37 PC (382.86 L.Y.)

HU 573 AB: 508; 333x: B star is faint but can pick it out with averted vision, well separated. A is a light yellow-white color.
13H 12M 29.95S +22° 55' 02.1" P.A. 185 SEP 4.1 MAG 9.83,12.30 SP G0 DIST. 295.86 PC (965.1 L.Y.)

HDS1873 AB: 508; 333x: IO Com. A is light yellow, B comes out of hiding with averted vision and lingers in my vision a little before fading. A is light blue. ~4" separation
13H 21M 03.57S +22° 28' 25.6" P.A. 184 SEP 4.4 MAG 9.24,12.70 SP G5 DIST. 168.63 PC (550.07 L.Y.)

BRT 161 AB: 508; 333x: Needed averted vision to see B star, ~5" from the 9th mag white A star
13H 25M 39.37S +25° 40' 55.9" P.A. 52 SEP 4.5 MAG 9.20,11.80 SP F8 DIST. 90.5 PC (295.21 L.Y.)

BU 115 AB: 508; 333x: When seeing settles out, I can detect a very faint point just beyond first diffraction, ~1.5". It's a smear during poorer seeing. Large magnitude difference. I could repeat the view at 667x but 333x is better. Burnham discovered this with his 6-inch at 1.3" -- it was more difficult for me at wider separation and larger aperture!
13H 45M 20.87S +09° 03' 28.6" P.A. 258 SEP 1.6 MAG 7.53,10.40 SP G5 DIST. 54.67 PC (178.33 L.Y.)

BU 801 AB: 508; 333x: A is light-yellow, B visible as point ~3" separation, very faint. Burnham discovered with the 15.5-inch refractor at Washburn
13H 46M 37.63S +10° 50' 26.2" P.A. 325 SEP 3.1 MAG 8.70,11.05 SP K2 DIST. 271.74 PC (886.42 L.Y.)

STF 1792 AB: 508; 333x: White stars one delta, ~2" separation
13H 57M 03.72S +12° 27' 03.5" P.A. 291 SEP 2.3 MAG 9.98,10.89 SP F8 DIST. 1470.59 PC (4797.06 L.Y.)

BRT1280 AB: 508; 333x: B is faint, a little reddish, can hold direct and averted vision brightens it. Wide, ~6"
13H 58M 20.22S +10° 08' 04.6" P.A. 109 SEP 6.2 MAG 8.08,11.55 SP F5 DIST. 82.58 PC (269.38 L.Y.)

A 569 AB: 508; 533x: Hairline split at best moments, to touching disks the rest of the time. Near equal white. Very tough
14H 01M 11.59S +25° 21' 36.4" P.A. 150 SEP 0.6 MAG 10.14,10.31 SP G0

HDS1978 AB: 508; 333x: A bit tough. I needed to flash B forth a little with averted vision to show clearly. ~1", 3-4 delta mag. I think this is as faint as I can go in my urban site.
14H 06M 16.46S +21° 59' 56.4" P.A. 122 SEP 1.2 MAG 9.86,13.54 SP G0 DIST. 2500 PC (8155 L.Y.)

A 346 AB: 508; 333x: Needed averted vision to flash hint of B, which is strange since they should be near equal. ~1"
14H 07M 50.60S +24° 43' 14.9" P.A. 310 SEP 0.9 MAG 10.31,10.49 SP G

COU 2507 AB: 508; 333x: I can barely detect the presence of these stars with direct vision, need averted to show hint of secondary. very tight, ~1" or slightly more
14H 09M 13.59S +18° 10' 42.4" P.A. 137 SEP 1.5 MAG 10.47,11.50

STF 1817 AB: 508; 1067x: !! I can only get a notched elongation using all powers, near equal. 0.19 separation, I think the first time I got below 0.2"! Struve discovery at 1.55" in 1832.
14H 14M 12.81S +26° 41' 43.8" P.A. 326.5 SEP 0.19 MAG 8.98,8.77 SP F8 DIST. 123.46 PC (402.73 L.Y.)

HDS2006 AB: 508; 333x: B seen only with averted vision, <1" separated from 9th mag white A star.
14H 16M 26.18S +25° 39' 09.2" P.A. 249 SEP 0.7 MAG 9.19,12.06 SP K0 DIST. 735.29 PC (2398.52 L.Y.)

TDS9181 AB: 508; 533x: Hairline best moments, noticeable magnitude difference
14H 23M 27.40S +26° 49' 24.3" P.A. 330 SEP 0.5 MAG 10.79,11.05

COU 184 AB: 508; 533x: Good clean image, ~1" separation, ~1 delta mag, yellow-white
14H 23M 38.30S +20° 08' 37.9" P.A. 113 SEP 0.9 MAG 10.84,10.85 SP G0

WFC 149 AB: 508; 533x: Well split, noticeable mag difference, ~1 delta mag, ~5" separation.
14H 27M 13.43S +18° 50' 22.3" P.A. 102 SEP 5 MAG 10.68,11.83

COU 2508 AB: 508; 667x: Dim near equal, brief hairline split at best moments, otherwise touching disks. 0.4" at discovery in 1988.
14H 28M 35.11S +18° 18' 11.7" P.A. 75 SEP 0.5 MAG 11.40,11.40

POU 3170 AB: 508; 333x: Faint but pretty pair, noticeable magnitude difference, ~4" separation
14H 28M 40.17S +24° 03' 51.6" P.A. 153 SEP 3.3 MAG 10.00,10.50

STF 3086 AB: 508; 333x: Easy wide tenth magnitude stars, ~1 delta mag, wide, light yellow color
14H 32M 20.64S +17° 18' 28.8" P.A. 272 SEP 6 MAG 10.06,10.83 SP F8+G5

HO 387 AB: 508; 333x: Though faint, B is easily seen while the scope is slewing. But when stopped it is harder to see and needed averted vision to see. A case where movement in the scope reveals the star. In a nice field, there is a line of ninth magnitude stars flowing beside it
14H 32M 52.45S +20° 09' 08.4" P.A. 242 SEP 9.4 MAG 9.74,12.59 SP G0 DIST. 163.4 PC (533.01 L.Y.)

BRT2418 AB: 508; 333x: Near equal white, ~5" separation
14H 35M 20.10S +20° 03' 21.7" P.A. 195 SEP 3.8 MAG 10.84,11.05

A 571 AB: 508; 333x: Very nice, B is a very faint glow on and ~0.5" separated from A, large delta mag, white
14H 39M 19.41S +26° 48' 23.6" P.A. 109 SEP 1.8 MAG 8.62,11.26 SP F2 DIST. 180.51 PC (588.82 L.Y.)

COU 406 AB: 508; 333x: Need averted vision to see b, it's only flashing of white, ~4" separation
14H 40M 19.78S +25° 48' 34.3" P.A. 17 SEP 3 MAG 9.01,12.00 SP F DIST. 177.94 PC (580.44 L.Y.)

A 2070 AB: 508; 333x: B holds steady when scope moving and then I need averted vision to clearly see it.
14H 41M 57.83S +17° 53' 07.5" P.A. 215 SEP 3.5 MAG 8.54,10.52 SP G0 DIST. 65.02 PC (212.1 L.Y.)

HU 575 AB: 508; 1067x: Overlapping disks to, hairline split in best moments, light orange stars.
14H 42M 33.63S +19° 28' 46.9" P.A. 84.3 SEP 0.33 MAG 9.77,10.05 SP M0 DIST. 21.58 PC (70.39 L.Y.)

COU 99 AB; 507; 667x: Split in best moments, fairly well apart. Very dim, however, and tough because of that.
14H 43M 13.12S +22° 45' 47.5" P.A. 206 SEP 0.7 MAG 11.00,11.50 SP K5

HO 551 AB: 508; 333x: Pretty tough one, need averted vision to see B, which is blue and pretty wide, A is light yellow-orange
16H 12M 25.15S +26° 25' 53.1" P.A. 81 SEP 6.9 MAG 8.01,12.80 SP K1III DIST. 301.2 PC (982.51 L.Y.)

COU 485 AB: 508; 333x: In the same field as HO 551. Exceedingly tight and faint, the pair is very close together and averted vision helps to brighten it
16H 12M 36.06S +26° 22' 47.3" P.A. 327 SEP 0.9 MAG 11.58,12.04

STF 2022 AB: 508; 333x: Rich field of stars, though no open cluster noted on my atlas, looks like a Hydra head in the 80mm finder. This is as an excellent pair, white, very large mag difference and B is just a tiny point hanging out just beyond A. Nice
16H 12M 45.46S +26° 40' 14.0" P.A. 153 SEP 2.5 MAG 6.54,10.03 SP F2V DIST. 73.26 PC (238.97 L.Y.)

BU 812 AB: 508; 333x: White pair, ~1 delta, split, <1". Burnham discovered with the Washburn 15.5" 0.87"
16H 07M 07.91S +16° 53' 37.6" P.A. 96 SEP 0.7 MAG 9.06,9.86 SP F5 DIST. 144.72 PC (472.08 L.Y.)

BRT2423 AB: 508; 333x: faint, half delta mag,, pretty wide, bluish due to faintness. Physical
16H 07M 17.49S +18° 52' 01.1" P.A. 334 SEP 4.8 MAG 10.80,11.00

WEI 30 AB: 508; 333x: Easy wide pair, more than 1 delta mag, white. physical
16H 07M 43.95S +20° 22' 27.9" P.A. 224 SEP 12.2 MAG 8.71,10.34 SP F5 DIST. 98.52 PC (321.37 L.Y.)

HDS227 AB: 508; 333x: White star, B appears averted vision only, ~1.5", physical
16H 08M 39.39S +22° 12' 13.8" P.A. 82 SEP 1.2 MAG 8.99,12.28 SP F5 DIST. 100.1 PC (326.53 L.Y.)

BRT3310 AB: 508; 333x: Faint pair, near equal, pretty wide ~5". (not physical)
16H 09M 34.19S +24° 02' 44.6" P.A. 257 SEP 4.3 MAG 11.50,11.70

COU 197 AB: 508; 667x: Suspect elongation only at all powers.
16H 11M 06.97S +20° 14' 38.0" P.A. 47 SEP 0.5 MAG 11.60,11.60

STF 2035 AB: 508; 333x: Lovely pair near bright star. ~1+ delta mag, >2" separation. A blue-white, B is slightly red. Physical
16H 18M 09.39S +25° 51' 41.2" P.A. 35 SEP 2.6 MAG 9.71,10.90 SP F5

COU 412 AB: 508; 333x: Very fine, B flashes with averted version, very close ~1" separation
16H 19M 13.71S +25° 52' 51.9" P.A. 84 SEP 1 MAG 9.90,12.40

BRT3311 AB: 508; 333x: Easy pair, near equal, ~5" separation. Not physical
16H 22M 33.77S +26° 24' 10.9" P.A. 217 SEP 4.8 MAG 11.80,11.70

A 25 AB: 508; 333x: Pretty light yellow and blue stars, B is rather faint, wide separation
16H 23M 59.49S +20° 23' 38.9" P.A. 113 SEP 5.5 MAG 8.28,10.80 SP K0

STF 2043 AB: 508; 333x: Pretty cream white A and grey-blue B, fairly faint, wide separation, large magnitude difference. Physical
16H 25M 26.90S +17° 18' 10.6" P.A. 85 SEP 9.9 MAG 8.03,11.44 SP G0 DIST. 107.07 PC (349.26 L.Y.)

WFC 174 AB: 508; 333x: Dual tenth magnitude, slight magnitude difference, wide. Physical
16H 25M 29.45S +19° 44' 12.6" P.A. 340 SEP 8 MAG 10.58,10.68

COU 198 AB: 508; 333x: Need averted vision to flash B out, very tight in but split cleanly
16H 25M 31.89S +20° 54' 17.6" P.A. 163 SEP 1.1 MAG 11.00,11.60

STH 3 AB: 508; 333x. Nice! Bright white A star, 12th mag B star is close, ~2" separation, and coalesces to a point with seeing
16H 27M 46.52S +20° 53' 44.2" P.A. 286 SEP 2.3 MAG 8.37,12.40 SP G DIST. 76.45 PC (249.38 L.Y.)

STF 2049 AB: 508; 333x: Nice clear but close split, ~2 delta mag & ~1.5" separation
16H 27M 54.63S +25° 59' 03.4" P.A. 195 SEP 1.1 MAG 7.33,8.10 SP A2.5V DIST. 132.8 PC (433.19 L.Y.)

COU 413 AB: 508; 333x: White star, B seen only with averted vision, wide, ~5"
16H 27M 49.33S +25° 05' 34.9" P.A. 320 SEP 4.6 MAG 9.70,10.50 SP A0

STF 2052 AB: 508; 333x: Yellow-white stars, ~1 delta mag, ~2.5" separation, very pretty. Physical
16H 28M 52.67S +18° 24' 50.6" P.A. 118.1 SEP 2.45 MAG 7.69,7.91 SP K1V DIST. 19.66 PC (64.13 L.Y.)

A 2084 AB: 508; 533x: Just hairline split, yellow-orange stars, near equal
16H 29M 33.44S +16° 35' 28.5" P.A. 131 SEP 0.4 MAG 10.24,10.22 SP G0

A 1860 AB: 508; 333x: Pretty light orange and blue pair, wide ~3-4", ~2 delta mag. Not physical, sadly
16H 29M 56.73S +14° 23' 39.9" P.A. 83 SEP 3.2 MAG 9.62,11.40 SP F5

A 566 AB: 508; 333x: cool "double double" in the field. This is the wide pair, near equal, ~5" separation
13H 22M 17.99S +26° 31' 10.1" P.A. 66 SEP 1.9 MAG 9.03,10.79 SP G0 DIST. 180.51 PC (588.82 L.Y.)

STF 2058 AB: 508; 333x: In the same field as A 566. This one is tighter, ~2" separation, near equal and brighter than A 566 -- I guess A 566 was out of reach of Struve's 9-inch?
16H 31M 43.32S +19° 18' 36.5" P.A. 352 SEP 2.1 MAG 10.37,10.55 SP K0

BU 817 AB: 508; 333x: Tight but split nicely, near equal white.
16H 32M 33.43S +23° 13' 56.0" P.A. 327 SEP 0.9 MAG 9.33,9.53 SP F8 DIST. 176.06 PC (574.31 L.Y.)

HO 553 AB: 508; 333x: B not hard to miss, though it is very faint and very widely separated
16H 40M 56.50S +21° 56' 53.3" P.A. 184 SEP 11.6 MAG 7.74,12.40 SP F8 DIST. 45.64 PC (148.88 L.Y.)

COU 2512 AB: 508; 667x: I only see a smudgy elongation, no resolution, seeing maybe getting worse
16H 41M 17.91S +18° 15' 32.9" P.A. 3 SEP 0.3 MAG 11.40,11.40

STF 2085 AB: 508; 333x: A is very light yellow and B very light blue, wide, ~1.5 delta mag.
16H 42M 26.09S +21° 35' 34.3" P.A. 309 SEP 5.9 MAG 7.38,9.17 SP A0IV DIST. 190.48 PC (621.35 L.Y.)

STF 2087 AB: 508; 333x: Pretty, near equal white, wide (not physical)
16H 42M 34.83S +23° 40' 01.9" P.A. 287 SEP 5.2 MAG 8.84,8.90 SP G5IV DIST. 53.85 PC (175.66 L.Y.)

STF 2094 AB: 508; 333x: Tight near equal white with a fainter plus one nearby.
16H 44M 10.57S +23° 31' 02.8" P.A. 73 SEP 1.1 MAG 7.48,7.87 SP F5III DIST. 156.49 PC (510.47 L.Y.)

HU 576 AB: 508; 333x: ! Quite a beautiful pairing, a real contrast in brightness. White is white, B is clean and steady, blue, ~5" separation, very nice pair
14H 45M 20.21S +20° 09' 22.5" P.A. 188 SEP 5.6 MAG 8.70,12.10 SP F5 DIST. 187.97 PC (613.16 L.Y.)

TDS9317 AB: 508; 333x: Need averted vision to see B, then can barely hold direct. Close, ~2", ~1 delta mag
14H 49M 40.92S +17° 09' 56.6" P.A. 141 SEP 2.3 MAG 11.02,11.98

POU3175 AB: 508; 333x: Faint pair, but both easily seen, wide ~5", noticeable mag difference. Not physical
14H 51M 07.34S +22° 58' 42.4" P.A. 299 SEP 3.8 MAG 11.40,12.20

COU 305 AB: 508; 333x: A is bright light yellow. B forms pretty clearly ~4" out, a dim shadow
14H 52M 29.24S +23° 48' 04.7" P.A. 65 SEP 3.7 MAG 7.37,12.50 SP K0 DIST. 210.53 PC (686.75 L.Y.)

COU 408 AB: 508; 333x: Faint, near equal, need averted vision to brighten B up a little
14H 54M 33.66S +22° 51' 10.0" P.A. 174 SEP 1.9 MAG 12.49,13.50

A 2072 AB: 508; 533x: Nice clean well split, near equal white stars. Hairline split at 333x
14H 58M 58.39S +17° 31' 41.3" P.A. 237 SEP 0.7 MAG 10.31,10.41 SP G5

COU 188 AB: 508; 667x: I sense elongation but can't get good focus at 1067x. 667x is best but it's not clean either. I suspect elongation even with just 533x
14H 59M 31.66S +17° 53' 27.6" P.A. 227 SEP 0.3 MAG 9.60,9.80 SP G0

TDS 772 AB: 508; 333x: Tight near equal, faint
15H 23M 09.33S +26° 28' 18.5" P.A. 357 SEP 1 MAG 11.61,11.87

TDS9592 AB: 508; 667x: Very tough, but B appears as the dimmest point within A's first diffraction when seeing totally settles and a is round and still
15H 41M 52.12S +26° 55' 27.4" P.A. 36 SEP 0.4 MAG 10.52,10.77

STF 1967 AB: 508; 1067x: Gamma CrB. Disk is misshapen, but not easy to tell an orientation. 0.7" at discovery, it is near closest separation now. Short period.
15H 42M 44.57S +26° 17' 44.3" P.A. 104.6 SEP 0.22 MAG 4.04,5.60 SP B9V+A3V DIST. 44.78 PC (146.07 L.Y.)

BRT 167 AB: 508; 333x: Nice little pair, ~3" and a slight magnitude difference, with Gamma CrB shining like a great sun nearby
15H 42M 55.89S +26° 23' 37.3" P.A. 235 SEP 3.1 MAG 12.24,12.20

COU 616 AB: 508; 333x: Very nice, just split at this magnification. Slight magnitude difference
15H 48M 27.69S +25° 59' 51.8" P.A. 161 SEP 0.8 MAG 9.31,9.87 SP G0

TDS9703 AB: 508; 533x: A is plain enough to see, white, but to see B I need averted vision and it is so tight it grows like a spike coming from A. Too dim to split.
15H 57M 12.46S +26° 40' 15.1" P.A. 296 SEP 0.7 MAG 11.94,12.22

Thursday, May 21, 2020

20 may 2020

After three weeks of no observing due to cloudy weather, finally had a night out last night. Transparency was poor; in fact there were marine clouds to the east and south, which seemed to threaten to take over at any moment, but somehow I remained in a bubble of relatively clear air. Seeing was choppy so I used my 8-inch mask throughout. I observed from 9pm to about 1am, when I became too tired to continue (and the pain in my injured neck was too bothersome). It was chilly but I wore a warm jacket, and there was moderate dewing.

BU 603 AB; 203; 533x: ! Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag.
11H 48M 38.71S +14° 17' 03.2" P.A. 328.4 SEP 1.01 MAG 5.97,8.53 SP A8III DIST. 59.74 PC (194.87 L.Y.)

STF 1534 AB: 203; 333x: Orange-yellow A, very faint B brightens with averted vision, but can hold direct. Wide, ~3 delta mag
11H 21M 49.34S +18° 11' 24.0" P.A. 315 SEP 5.1 MAG 8.08,11.14 SP G5 DIST. 31.05 PC (101.29 L.Y.)

HEI 157 AB: 203; 333x: Faint pair, B is just visible with averted vision but can see it well enough
11H 26M 20.44S +16° 10' 05.7" P.A. 157 SEP 1.6 MAG 9.50,10.50 SP G5

BRT 2411 AB: 203; 333x: Visible with direct vision but averted vision makes the pair glitter and flash like Christmas lights. ~3", ~1 delta mag
11H 23M 02.19S +20° 07' 21.3" P.A. 316 SEP 3.1 MAG 10.71,11.59 SP F8

A 2485 AB: 203; 333x: Really needed averted vision to see the B star, faint pair.
11H 54M 29.83S +17° 34' 57.3" P.A. 216 SEP 2.3 MAG 9.50,12.40 SP A

SHJ 130 AB: 203; 333x: White and superwide, ~2 delta mag, not physical. Missed the 0.9" 10th mag. Aa,Ab HDS 1665 -- which is physical
11H 47M 28.40S +20° 02' 01.3" P.A. 30 SEP 71 MAG 7.52,9.94 SP F5 DIST. 92.51 PC (301.77 L.Y.)

KU 41 AB: 203; 333x: White near equal, ~5".
11H 55M 33.09S +16° 53' 49.8" P.A. 68 SEP 5.1 MAG 10.14,10.31 SP G0+G0

BRT1275 AB: 203; 333x: White, half delta mag, ~3". Pleasing pair, though not physical
11H 51M 41.69S +16° 13' 46.1" P.A. 69 SEP 2.9 MAG 10.00,10.20

SHJ 3335 AB: 203; 333x: Faint near equal, ~7" wide, plus one more much further out ~2 delta mag. fainter. AC. None are physical
11H 51M 57.98S +14° 00' 34.4" P.A. 70 SEP 6.8 MAG 9.70,10.00

WOR 20 AB: 203; 333x: With seeing the elongated smear resolves into two faint points, very tight ~1".
11H 54M 25.71S +15° 15' 12.3" P.A. 288 SEP 1.2 MAG 11.19,11.40 SP M0V DIST. 41.55 PC (135.54 L.Y.)

STF 1722 AB: 203; 333x: Nice pair, white A and yellowish B, ~3" and ~2 delta mag
13H 08M 26.46S +15° 29' 29.9" P.A. 337 SEP 2.5 MAG 8.38,9.26 SP K1IV DIST. 90.83 PC (296.29 L.Y.)

COU 2708 AB: 203; 333x: ! B seen with averted vision, then I can hold direct. White stars, ~5". Nice. Physical
13H 08M 04.40S +23° 24' 42.8" P.A. 78 SEP 4 MAG 9.60,10.50 SP G5

COU 11 AB: 203; 333x: ! 39 Com. Very beautiful pair, A is creamy white, B is much fainter and bluish, ~1.5", resolved with seeing just beyond first diffraction
13H 06M 21.28S +21° 09' 12.6" P.A. 314 SEP 1.8 MAG 6.10,8.75 SP F4V DIST. 49.68 PC (162.06 L.Y.)

HO 257 AB: 203; 333x: ! Equal white, nice, ~2"
13H 05M 51.04S +26° 13' 36.4" P.A. 154 SEP 2 MAG 10.37,10.91 SP G5

STF 1714 AB: 203; 333x: Near equal white, ~3". Surprisingly not physical
13H 03M 40.25S +23° 38' 35.3" P.A. 308 SEP 3.1 MAG 10.31,10.40 SP F8 DIST. 531.91 PC (1735.09 L.Y.)

STT 253 AB: 203; 333x: Blue-white A and can detect B with direct vision, but it flashes with averted. Wide.
12H 43M 59.85S +21° 10' 22.9" P.A. 238 SEP 6.5 MAG 7.99,10.51 SP B0 DIST. 156.25 PC (509.69 L.Y.)

STF 1666 AB: 203; 333x: Nice pair, very wide, ~2 delta mag. Physical
12H 39M 10.03S +14° 19' 38.1" P.A. 192 SEP 7.4 MAG 8.15,10.30 SP AM DIST. 434.78 PC (1418.25 L.Y.)

STF 1663 AB: 203; 333x: Hairline split, ~1 delta mag, tough. Light yellow-orange A
12H 37M 10.81S +21° 11' 52.5" P.A. 66.5 SEP 0.63 MAG 8.03,9.16 SP F3V DIST. 187.27 PC (610.87 L.Y.)

STF 1652 AB: 203; 333x: KK Com. Wide, ~1 delta mag, pleasing view [very slight magnitude variance only 0.2 mag.]
12H 32M 31.07S +21° 06' 03.3" P.A. 178 SEP 6.1 MAG 10.12,10.40 SP G0 DIST. 606.06 PC (1976.97 L.Y.)

COU 96 AB: 203; 333x: White A, very faint B, can detect it direct vision but brightens with averted.
13H 10M 52.35S +21° 14' 01.4" P.A. 310 SEP 10.8 MAG 6.82,10.80 SP F2II DIST. 141.44 PC (461.38 L.Y.)

COU 54 AB: 203; 333x; Brighter white A, need averted vision for B, wide
13H 11M 32.36S +21° 55' 07.4" P.A. 288 SEP 10.5 MAG 6.82,10.90 SP G5III DIST. 147.93 PC (482.55 L.Y.)

BU 800 AB: 203; 333x: ! Nice pair, A is a light but rich yellow, B is blue-white. Wide, ~2 delta mag.
13H 16M 51.05S +17° 01' 01.9" P.A. 104.8 SEP 7.79 MAG 6.66,9.50 SP K1V+M1V DIST. 11.07 PC (36.11 L.Y.)

SHJ 223 AB; 203; 333x: Nice super wide, ~2 delta mag. Missed HDS 1870 Aa,Ab 9.58 mag 0.4"
13H 20M 09.39S +15° 33' 50.6" P.A. 5 SEP 36.2 MAG 7.25,12.23 SP G5 DIST. 193.42 PC (630.94 L.Y.)

A 566 AB: 203; 333x: !! Wow, very fine, very delicate pair, ~2" and ~2-3 delta mag.
13H 22M 17.99S +26° 31' 10.1" P.A. 66 SEP 1.9 MAG 9.03,10.79 SP G0 DIST. 180.51 PC (588.82 L.Y.)

STT 266 AB: 203; 333x: ~0.5 delta mag, ~2 separation, nice looking pair.
13H 28M 26.68S +15° 42' 30.5" P.A. 358.1 SEP 1.99 MAG 7.97,8.42 SP F5 DIST. 50.99 PC (166.33 L.Y.)

A 567 AB: 203; 333x: !! Excellent pair, bright yellow-white A. B is resolved with seeing just beyond first diffraction ring, ~1.5"
13H 32M 48.21S +24° 20' 48.3" P.A. 254 SEP 1.4 MAG 6.21,9.71 SP G8III DIST. 134.59 PC (439.03 L.Y.)

STF 1756 AB: 203; 333x: Blue-white stars, half delta mag, very wide
13H 33M 19.04S +23° 00' 51.0" P.A. 177 SEP 14.7 MAG 9.87,10.36 SP G5

STF 1760 AB: 203; 333x: Wide white stars, near equal
13H 34M 23.81S +26° 16' 34.0" P.A. 64 SEP 8.8 MAG 8.77,9.12 SP F2 DIST. 120.48 PC (393.01 L.Y.)

STF 1772 AB: 203; 333x: ! 1 Boo. Odd colors. Blue-white to greenish stars, wide, about 3 delta mag. AC is the very faint star well separated at nearly a right angle PA from the AB pair.
13H 40M 40.50S +19° 57' 20.4" P.A. 134 SEP 4.4 MAG 5.76,9.60 SP A1V DIST. 100.6 PC (328.16 L.Y.)

STF 1779 AB: 203; 333x: ~2 delta mag, wide, ~4"
13H 44M 33.98S +23° 40' 06.0" P.A. 145 SEP 3.8 MAG 9.26,10.37 SP A5 DIST. 775.19 PC (2528.67 L.Y.)

STF 1785 AB: 203; 333x: Slightly orange-tinged white stars, near equal, well separated.
13H 49M 04.00S +26° 58' 47.7" P.A. 189.8 SEP 2.78 MAG 7.36,8.15 SP K4V+K6V DIST. 13.41 PC (43.74 L.Y.)

A 568 AB: 203; 333x: B is faint but easily detected, nice close pair
13H 52M 27.03S +25° 44' 27.1" P.A. 321 SEP 2.6 MAG 10.15,11.20 SP F5 DIST. 239.23 PC (780.37 L.Y.)

BU 30 AB: 203; 333x: B seen with averted vision, wide
13H 58M 07.43S +19° 27' 29.8" P.A. 200 SEP 8 MAG 8.82,11.78 SP F5 DIST. 154.08 PC (502.61 L.Y.)

STF 1793 AB: 203; 333x: White stars, widely separated, ~1.5 delta mag. Nice pair.
13H 59M 05.25S +25° 48' 57.6" P.A. 245 SEP 4.9 MAG 7.46,8.39 SP A5V DIST. 153.61 PC (501.08 L.Y.)

STF 1794 AB: 203; 333x: ~1 delta mag, well separated ~2", nice pair
13H 59M 48.26S +19° 52' 57.8" P.A. 126 SEP 2 MAG 9.48,9.65 SP F8 DIST. 151.29 PC (493.51 L.Y.)

A 2064 AB: 203; 533x: Elongated at 333x, split with a lot of smearing of the image due to poor transparency with 533x. Tough but worth the effort
14H 03M 24.63S +17° 40' 00.1" P.A. 179 SEP 1 MAG 9.61,11.00 SP G5

STF 1804 AB: 203; 333x: Easy ~1.5 delta mag, wide pair, white stars
14H 08M 15.53S +21° 11' 34.9" P.A. 14 SEP 4.7 MAG 8.17,9.28 SP F8 DIST. 72.46 PC (236.36 L.Y.)

STF 1808 AB: 203; 333x: ~1.5 delta, wide white stars
14H 10M 07.76S +26° 35' 58.1" P.A. 83 SEP 2.5 MAG 8.83,9.63 SP G5 DIST. 70.87 PC (231.18 L.Y.)

BU 224 AB: 203; 333x: ! Hairline split with seeing, light yellow-white stars, noticeable mag difference. Snowman when seeing is not stable.
14H 13M 26.94S +12° 34' 26.2" P.A. 98 SEP 0.68 MAG 8.94,9.35 SP G0 DIST. 99.9 PC (325.87 L.Y.)

STT 279 AB: 203; 333x: ! Fine pair, white A and slightly peach color B, ~2" separated and ~3 delta mag.
14H 13M 49.46S +11° 59' 51.9" P.A. 257 SEP 2.2 MAG 6.84,9.13 SP K2III DIST. 170.94 PC (557.61 L.Y.)

HWE 32 AB: 203; 333x: Surprisingly easy, two delta and fairly wide.
14H 16M 15.42S +23° 21' 38.5" P.A. 194 SEP 4.6 MAG 9.92,10.61

STF 1825 AB: 203; 333x: ! Cream white A and light blue B, wide ~5", ~2 delta mag.
14H 16M 32.84S +20° 07' 18.7" P.A. 152.5 SEP 4.43 MAG 6.47,8.42 SP F6V DIST. 32.63 PC (106.44 L.Y.)

BU 1441 AB: 203; 333x: Fine if faint pair, wide ~4", ~2 delta mag, bluish color due to their faintness
14H 16M 35.81S +23° 28' 36.3" P.A. 80 SEP 3.6 MAG 10.10,11.60

STF 1828 AB: 203; 333x: Very nice faint near equal pair, a bit hazy until seeing stills then very fine bluish points resolve.
14H 16M 58.35S +24° 11' 33.4" P.A. 159 SEP 2.1 MAG 10.40,10.75 SP F2

HO 542 AB: 203; 333x: ! Faint near equal, very finely split with seeing, bluish stars
14H 27M 33.26S +20° 37' 07.2" P.A. 35 SEP 0.9 MAG 10.26,10.27 SP G0 DIST. 113.12 PC (369 L.Y.)

HO 543 AB: 203; 333x: White stars, near equal, wide ~5"
14H 27M 54.80S +21° 22' 33.9" P.A. 237 SEP 4.7 MAG 9.57,9.72 SP F8 DIST. 100.4 PC (327.5 L.Y.)

STF 3087 AB: 203; 333x: Nice pair ~4" separation, hardens with seeing to points, bluish. [Missed ITF 140 AC and BC, 10.6 mag and 4" and 7.6"]
14H 36M 15.39S +19° 24' 22.3" P.A. 222 SEP 2.3 MAG 10.63,10.67 SP G1III+F9V DIST. 182.48 PC (595.25 L.Y.)

STF 1864 AB: 203; 333x: Pi 1 Boo. Very bright, ~1 delta mag, off white stars.
14H 40M 43.56S +16° 25' 05.9" P.A. 113 SEP 5.5 MAG 4.88,5.79 SP B9PMNHG DIST. 93.72 PC (305.71 L.Y.)

STF 1884 AB: 203; 333x: Prototypical pair, >1 delta mag, ~3" separation, white to off white color
14H 48M 23.37S +24° 22' 01.0" P.A. 56 SEP 2.2 MAG 6.58,7.48 SP F8IV-V DIST. 84.67 PC (276.19 L.Y.)

HJ 2747 AB: 203; 333x: Faint, wide, noticeable mag difference, ~ half delta mag.
14H 48M 52.46S +24° 03' 51.7" P.A. 47 SEP 12.9 MAG 11.60,12.60

AG 346 AB: 203; 333x: Faint pair, wide, ~1 delta mag.
14H 49M 04.12S +26° 27' 39.6" P.A. 335 SEP 9.6 MAG 9.95,10.40 SP F5

HO 389 AB: 203; 333x: ! Extremely faint B resolves with best seeing as a tiny faint point outside first diffraction. Very tough, very excellent object
14H 52M 07.44S +20° 17' 26.5" P.A. 88 SEP 1.6 MAG 6.96,10.49 SP A0 DIST. 109.17 PC (356.11 L.Y.)

A 2071 AB: 203l 333x: EQ Boo. ! Very fine pair nicely split, ~1", ~1 delta mag.
14H 52M 25.79S +17° 57' 23.3" P.A. 273 SEP 1.3 MAG 9.34,9.95 SP G5 DIST. 105.82 PC (345.18 L.Y.)

BU 31 AB: 203; 333x: ! White A and light yellow B, finely split, ~2 delta mag.
14H 52M 30.05S +18° 44' 19.5" P.A. 221.7 SEP 2.01 MAG 8.53,10.26 SP G0V DIST. 48.43 PC (157.98 L.Y.)

STT 288 AB: 203; 333x: Consistent split, better with seeing, ~1 delta mag, ~1" separation, blue-white stars
14H 53M 23.35S +15° 42' 18.3" P.A. 156.3 SEP 0.96 MAG 6.89,7.55 SP F9V DIST. 47.64 PC (155.4 L.Y.)

OL 187 AB: 203; 333x: Faint pair, but with seeing the elongated smear resolves to two points, ~1 delta mag, ~2". [Uncertain pair.]
14H 58M 30.09S +15° 07' 55.4" P.A. 81 SEP 1.8 MAG 11.20,11.40 SP A2

HU 1155 AB: 203; 333x: Blue-white stars, B is faint but can detect with direct vision and it flashes with averted. [not physical]
15H 01M 51.41S +15° 06' 20.7" P.A. 15 SEP 4 MAG 9.40,10.90 SP F8

STF 1932 AB: 203; 333x: ! Very beautiful near equal white stars, ~1.5"
15H 18M 20.19S +26° 50' 24.7" P.A. 266.8 SEP 1.62 MAG 7.32,7.41 SP F6V+F6V DIST. 35.98 PC (117.37 L.Y.)

STF 1941 AB: 203; 333x: Faint stars, noticeable mag difference, very close ~1"
15H 25M 42.81S +26° 37' 40.5" P.A. 212 SEP 1.4 MAG 9.65,9.77 SP F5 DIST. 168.63 PC (550.07 L.Y.)

STF 1955 AB: 203; 333x: Near equal white stars, wide.
15H 33M 51.28S +26° 42' 30.4" P.A. 237 SEP 7.8 MAG 9.84,10.32 SP F8

Tuesday, April 28, 2020

zeta boo and more

Last night's forecast was for clear skies but middling transparency, but with seeing improving after 1am. So I took a nap in the evening expecting to be out very late. Transparency was as forecast, though it was more clear around 10pm-12am. Seeing was actually good in the same window. Around 1am the transparency grew worse, and the close stars were hazy. Seeing didn't seem to be getting any better, so I wrapped up at 1:30am.

All the same it was a big night. The very close Zeta Boo was a highlight. I also did a survey of Alpha Com. Many other close pairs to enjoy. After 11pm though, when neighbors and family had gone to sleep, I had to be mindful of not slewing too much or moving the ladder around, so as not to wake anyone.

A 2144 AB: 508; 205x: Light yellow-white A and B is easily seen, ~2" separation, yellow, almost two delta mag.
10h 09m 09.51s +21° 15' 29.9" P.A. 287 sep 2.7 mag 9.79,11.58

A 1988 AB: 508; 533x: Clean split with seeing, light orange stars, fairly equal but noticeable magnitude difference.
10h 09m 04.77s +25° 31' 03.2" P.A. 223 sep 0.4 mag 10.00,9.80 Sp K0 dist. 117.65 pc (383.77 l.y.)

COU 166 AB: 508; 333x: B flashes into view with averted vision. Close pair ~2" separation.
10h 07m 15.20s +22° 15' 17.2" P.A. 159 sep 2.5 mag 10.50,10.50 Sp F8

TDS 569 AB; 508; 333x: Easy, near equal blue-white stars, >2" separation [not physical]
10h 06m 33.24s +26° 01' 34.5" P.A. 89 sep 2.3 mag 10.94,11.08

TDS 6998 AB; 508; 533x: Elongation flashing with averted vision, but its hazy, not clear.
10h 04m 05.09s +27° 26' 54.3" P.A. 297 sep 0.8 mag 11.13,11.36

STF 1421 AB: 508; 333x: Wide pair, >1 delta mag, white tinged with yellow, ~5"
10h 18m 05.54s +27° 31' 27.9" P.A. 330 sep 4.6 mag 8.19,9.12 Sp F2 dist. 429.18 pc (1399.99 l.y.)

STF 1423 AB: 508; 533x: Split with seeing, light orange A and very faint, ~3 delta mag B, very close, within diffraction ring <1".
10h 19m 10.64s +20° 33' 48.1" P.A. 302.6 sep 0.6 mag 9.40,10.08 Sp K0 dist. 58.79 pc (191.77 l.y.)

HDS 1511 AB: 508; 1067x: Out of round olive, airy disk swimming in diffraction.
10h 32m 17.36s +24° 26' 32.1" P.A. 38 sep 0.1 mag 7.48,9.08 Sp F0 dist. 99.01 pc (322.97 l.y.)

HJ 484 AB: 508; 333x: B is seen with averted vision and I can barely hold it direct. Both A & B are a little blue due to their dimness. Wide. [not physical]
10h 32m 32.67s +27° 38' 50.0" P.A. 219 sep 12.3 mag 11.67,13.20

STF 1451
AB: 508; 333x: Easy pair, wide, ~1 delta mag
10h 35m 24.86s +26° 16' 09.7" P.A. 271 sep 8.5 mag 9.81,12.17 Sp G5

BAR 39 AB: 508; 533x: B appears with averted vision, very tight.
10h 39m 21.56s +22° 28' 02.3" P.A. 289 sep 1.1 mag 10.71,12.20

STT 225 AC; 508; 333x: Very light yellow-orange A and ~2 delta mag, wide B. Did not see PER 2 AB, 8.53/10.60 0.4".
10h 40m 03.23s +19° 14' 25.6" P.A. 357 sep 6.5 mag 8.53,10.38 Sp F8 dist. 101.73 pc (331.84 l.y.)

STT 230 AB: 508; 333x: Cool effect of B appearing with averted vision like a meteor out of the corner of my eye. Wide. [not physical]
10h 54m 32.46s +20° 46' 22.9" P.A. 40 sep 9.2 mag 8.71,11.95 Sp F5 dist. 153.61 pc (501.08 l.y.)

BU 597 AB: 508; 333x: ! ~2 delta mag and ~1" separation, light orange stars, very steady images. Really nice.
10h 54m 49.70s +23° 45' 20.7" P.A. 47 sep 0.9 mag 9.20,10.13 Sp A5 dist. 183.49 pc (598.54 l.y.)

BRT 2405 AB: 508; 333x: A is a blue star, B appearing with averted vision.
10h 56m 44.65s +22° 15' 27.2" P.A. 222 sep 4.2 mag 11.40,11.90

Alpha Com: STF 1728 AB:
13h 09m 59.28s +17° 31' 46.0" P.A. 192.2 sep 0.52 mag 4.85,5.53 Sp F5V+F6V dist. 17.83 pc (58.16 l.y.)
I spent some time going though different combinations on Alpha Com, and here is a table of my notes:



The conclusions I draw:

8-inch mask gave the cleanest images, but did not have enough resolving power in my conditions. 8-inch might have done better at a higher elevation site (I'm at sea level) or in even better seeing.

72% Central Obstruction mask gave the tightest disk images, and resolved pretty well, but the crazy cross hatch diffraction will take some getting used to. Will need to experiment with this more.

Apodizing mask: I lose some resolution but the images a better than full aperture

Full aperture: best resolution & brighter but the diffraction is more pronounced, so depends highly on the seeing.

STF 1865 AB: 508; 1067x: Zeta Boo. Short period.
First impression was moderately well notched overlapping disks (eg. not barely notched, but not strongly notched either). With more time observing & getting used to the image, and in moments of better seeing, the notch became more distinct. It would not separate in spite of moments of better seeing. I could also see the elongation, but only subtly notched due to the smaller scale, at 667x.
14h 41m 08.92s +13° 43' 42.0" P.A. 293.8 sep 0.53 mag 4.46,4.55 Sp A0V+A0V dist. 53.88 pc (175.76 l.y.)


STF 1888 AB: 508; 333x: Xi Boo. Short period.  Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty.
14h 51m 23.38s +19° 06' 01.7" P.A. 297.9 sep 5.3 mag 4.76,6.95 Sp G8V+K5V dist. 6.71 pc (21.89 l.y.)

STT 235 AB: 508; 533x: Short period. Pretty yellow A, orange B, ~1" ~2 delta mag.
11h 32m 20.76s +61° 04' 57.9" P.A. 44.2 sep 0.95 mag 5.69,7.55 Sp F8V dist. 27.99 pc (91.3 l.y.)


STF 1523 AB: 508; 333x: Alula Australis. Short period.  Pretty orange-yellow stars, ~half delta mag, ~2" separation.
11h 18m 10.90s +31° 31' 45.0" P.A. 156.5 sep 2.1 mag 4.33,4.80 Sp F9V+G9V dist. 10.42 pc (33.99 l.y.)
STF 1524 AB: 508; 333x: Alula Borealis. Bright orange A and B is a neat little white point well separated and very much fainter
11h 18m 28.74s +33° 05' 39.5" P.A. 145 sep 7.8 mag 3.64,10.10 Sp K3IIIBaO dist. 122.4 pc (399.27 l.y.)

COU 1259 AB: 508; 533x: Smudgy elongation. Not quote resolved. Conditions seem to be deteriorating.
11h 20m 19.91s +36° 03' 58.3" P.A. 311 sep 0.7 mag 10.41,10.86

STF 1543 AB: 508; 333x: 57 UMa. A is a pale yellow, B a neat orange, ~3 delta, wide ~6"
11h 29m 04.12s +39° 20' 13.1" P.A. 354 sep 5.4 mag 5.35,10.67 Sp A2V dist. 65.23 pc (212.78 l.y.)

STT 234 AB: 508; 1067x: Surprisingly tough. Had indications of elongation at powers starting from 533x, but needed 1067x to get the clear bump, but even then it wasn't cleanly split.
11h 30m 49.91s +41° 17' 12.7" P.A. 186.3 sep 0.4 mag 7.45,8.13 Sp F6V dist. 74.79 pc (243.96 l.y.)

Monday, April 27, 2020

26 April 2020

The forecast for last night was for clear in the early evening and then poor transparency later on, and that forecast held true. Seeing was not so great, 5-6/10, better high up. The moon was low in the west when I came out at 9pm, and clear. But by 10pm it cast its glow over a haze, and then I saw bands of high clouds coming overhead. So I had to wrap up at 10:30pm. All the same there were some good pairs. I started in eastern Lynx and then moved to Leo Minor which was in pretty good position.

ES 1541 AB: 508; 333x: White and dull white pair, ~1 delta mag, wide ~8"
09h 22m 05.95s +39° 58' 00.7" P.A. 23 sep 8.2 mag 10.41,11.20

TDS6583 AB: 508; 533x: Just split with seeing, very tight, noticeable mag difference ~0.5-1, orange stars
09h 28m 23.15s +39° 54' 56.7" P.A. 71 sep 0.5 mag 10.78,10.94

STF 1374 AB: 508; 333x: Pretty orange-yellow stars, ~2 delta mag, ~3 separation
09h 41m 21.88s +38° 57' 01.9" P.A. 311.5 sep 2.81 mag 7.28,8.65 Sp G3IV dist. 51.28 pc (167.28 l.y.)

HO 369 AB: 508; 1067x: With 533x I can tell this is not single, but the elongation is too tentative. At 1067x the best I can manage is elongated notched, with seeing. Seeing and transparency are not good enough.
09h 51m 09.34s +36° 29' 20.8" P.A. 106.3 sep 0.41 mag 8.02,9.85 Sp F2 dist. 121.21 pc (395.39 l.y.)

A 2139 AB: 508; 333x: White A and blue B, ~2" separation, >2 delta mag. [not physical]
09h 52m 15.53s +40° 58' 13.4" P.A. 292 sep 2 mag 8.01,10.68 Sp A3 dist. 95.51 pc (311.55 l.y.)

HJ 2509
AB: 508; 333x: Wide light blue stars, ~1 delta mag.
09h 52m 50.16s +37° 11' 32.0" P.A. 61 sep 15.8 mag 10.89,11.70 Sp G0

HU 631 AB: 508; 533x: Bright orange-yellow A star, B is a very small, faint blue point, ~1" separation, very much fainter ~3 delta mag.
10h 03m 59.08s +32° 38' 48.8" P.A. 258 sep 0.8 mag 8.00,9.34 Sp F8 dist. 76.45 pc (249.38 l.y.)

HU 877 AB: 508; 333x: Very fine white pair, ~2 delta mag, ~2" separation, very nice.
10h 25m 32.60s +36° 46' 59.0" P.A. 250 sep 1.7 mag 9.14,10.47 Sp G0 dist. 224.22 pc (731.41 l.y.)

HU 880 AB: 508; 333x: ! Exceptionally fine split, white stars.
10h 31m 14.44s +37° 07' 27.4" P.A. 144 sep 0.9 mag 10.10,10.43 Sp F8

STF 1443
AB: 508; 333x: Wide pair, white, ~1 delta
10h 33m 17.07s +37° 40' 25.0" P.A. 161 sep 5.3 mag 9.87,10.00 Sp G0 dist. 99.8 pc (325.55 l.y.)

STF 1459 AB: 508; 333x: Wide light yellow-orange stars, ~2 delta.
10h 40m 12.46s +38° 24' 11.4" P.A. 153 sep 4.6 mag 8.34,8.85 Sp K4III dist. 2325.58 pc (7586.04 l.y.)