25 august 2024

Opened the 20-inch last night.  Seeing was good but not great, so I stuck to the CDSA throughout, though I used full aperture with the apodizing screen.  The star images were not as clean as with the refractor, due to reflector light scatter and the larger aperture throwing off more diffraction & being more affected by seeing.  It does make me a little more motivated to try to salvage the Dalton, since if the optics were fixed it would be a killer double star scope...

BU  248 AB: 508; 280x: Nice close pair, 3 Dm, white.  24% PRO, 985 AU WS, 6.5+3.0 Msol, it is possibly binary and an orbit should be tried. 

19h 17m 43.64s +23° 01' 32.0" P.A. 128.00 sep 1.8 mag 5.43,8.75 Sp B0.5IV dist. 373.13 pc (1217.15 l.y.)

BU  428 AB: 508; 390x: Light orange A, B is closely split, blue-white, 2 Dm.  No Gaia data for the secondary.  Given the difficulty, an orbit should be tried.

20h 06m 43.37s +12° 56' 12.1" P.A. 355.00 sep 0.8 mag 7.55,9.13 Sp F4III

HEI 568 AB: 508; 1270x: 18 Aql. In good but not great seeing and with some haze in the air, with my 20-inch with apodizing screen, I could tell elongation at >600x. At 1270x and a light blue filter added, I had to overlapping hazy spurious disks (two photocenters within the notched elongation, one fainter than the other).  For a couple instants it seemed to hairline split, but very briefly.  PA firmly to the SW.  First diffraction ring forms the outline of a peanut.  SOC grade 4 orbit, 205-year period, it will turn to the south in the next 15 years.  No Gaia parallax data.

19h 06m 58.60s +11° 04' 16.7" P.A. 243.00 sep 0.265" mag 5.44,6.39 Sp B8III dist. 214.13 pc (698.49 l.y.)

AGC 12 BC: 508; 500x: BC is very faint near to bright A.  Above 280x, I can see it as a closely separated unequal pair, direct vision, but foveal coaxing helps.  -46% PRO, it is not binary.

20h 18m 03.22s -12° 32' 47.9" P.A. 241.00 sep 1.2 mag 11.20,11.50

 

HWE  55 AB: 508; 140x: Easy wide pair, 4 Dm.  35% PRO, 2,605 AU WS, 2.6+0.7 Msol, it is possibly binary and needs an orbit.

20h 57m 10.57s +00° 27' 50.2" P.A. 71.00 sep 26.3 mag 6.05,11.76 Sp K2III dist. 93.98 pc (306.56 l.y.)

RST4659 AB: 508; 280x: Lovely close 2 Dm pair, white A and yellowish B.  83% PRO, 118 AU WS, 1.0+1.6 Msol, and RVD 1.8 < EV 6.2, it is very likely binary and needs an orbit.

20h 16m 50.26s -03° 29' 30.0" P.A. 7.00 sep 1.8 mag 7.16,9.19 Sp F5 dist. 64.85 pc (211.54 l.y.)

S   740 AB: 80; 13x: Finder, easy near equal wide pair.  -9% PRO, it is not binary.

20h 14m 09.77s +06° 35' 20.3" P.A. 192.00 sep 43.9 mag 7.77,8.06 Sp G4IV dist. 61.12 pc (199.37 l.y.)

S   749 AB: 508; 140x: Wide, white, half delta magnitude, with string of faint stars near.  -17% PRO, it is not binary.

20h 27m 27.56s -02° 06' 10.5" P.A. 189.00 sep 60.0 mag 6.76,7.51 Sp F5V+G2V+ dist. 46.9 pc (152.99 l.y.)

BU 987 AB: 508; 280x: Very faint B, fairly closely split.  No Gaia parallax data for the secondary.  It seems to be a bit far to be binary.

20h 30m 14.44s +19° 25' 15.7" P.A. 128.00 sep 2.5 mag 6.80,11.10 Sp B7IV dist. 386.1 pc (1259.46 l.y.)

STF2489 AB: 508; 140x: Bright white A and 3 Dm, wide, yellowish B.  -60% PRO, it is not binary.

19h 16m 26.78s +14° 32' 40.6" P.A. 347.00 sep 8.3 mag 5.67,9.30 Sp B9.5V dist. 125.63 pc (409.81 l.y.)

STF2492 AB: 508; 280x: Light yellow stars, 3 Dm, well split.  54% PRO, 417 AU WS, 3.6+1.5 Msol, it is possibly binary and needs an orbit.

19h 18m 32.49s +01° 05' 06.3" P.A. 2.00 sep 3.3 mag 5.28,8.29 Sp G9III dist. 113.77 pc (371.12 l.y.)

STF2525 AB: 508; 200x: Equal yellow-white stars, nice, fairly close split.  63% PRO, 127 AU WS, 1.1+1.2 Msol, there is a SOC grade 3 orbit 510-year period.

19h 26m 33.71s +27° 19' 21.9" P.A. 290.00 sep 2.3 mag 8.19,8.39 Sp F8 dist. 64.52 pc (210.46 l.y.)

STF2643 AB: 508; 140x: White A and light orange B, 2 Dm.  -15% PRO, it is not binary.

20h 12m 47.31s -02° 59' 45.4" P.A. 81.00 sep 3.0 mag 7.09,9.40 Sp A0V dist. 133.33 pc (434.92 l.y.)

STF2644 AB: 508; 140x: Bright near equal white stars.  16% PRO, 416 AU WS, 2.4+2.4 Msol, it is possibly binary and needs an orbit.

20h 12m 35.09s +00° 52' 00.2" P.A. 205.00 sep 2.6 mag 6.92,7.06 Sp B9p dist. 180.51 pc (588.82 l.y.)

STF2654 AB: 508; 140x: Unequal white stars, wide.  57% PRO, 1,299 AU WS, 1.9+1.5 Msol, RVD 1.1 < EV 2.1, it is very likely binary and needs an orbit.

20h 15m 10.63s -03° 30' 12.9" P.A. 232.00 sep 14.4 mag 6.96,8.14 Sp F2V+F4V dist. 105.82 pc (345.18 l.y.)

STF2656 AB: 508; 140x: Easy wide pair, 3 Dm.  -10% PRO, it is not binary.

20h 15m 37.14s +07° 48' 32.4" P.A. 233.00 sep 9.7 mag 7.34,11.30 Sp A7III dist. 122.7 pc (400.25 l.y.)

STF2661 AB: 508; 140x: Very wide, half delta magnitude.  7% PRO, 6,556 AU WS, 2.9+1.9 Msol, RVD 1.2 > EV 1.1, it is not likely binary.

20h 19m 52.68s -02° 14' 51.0" P.A. 341.00 sep 24.4 mag 7.87,9.19 Sp A0

STF2742 AB: 508; 140x: White near equal stars, well split.  32% PRO, 332 AU WS, 1.9+1.9 Msol, it is likely binary and needs an orbit.

21h 02m 12.51s +07° 10' 47.3" P.A. 213.00 sep 3.0 mag 7.41,7.64 Sp F8 dist. 80.97 pc (264.12 l.y.)

STFA 40 AB: 508; 140x: Wide, white.  -94% PRO, it is not binary.

19h 18m 50.94s +00° 20' 20.4" P.A. 316.00 sep 423.5 mag 6.52,6.78 Sp K0IIIa dist. 127.06 pc (414.47 l.y.)

STT 409 AB: 508; 140x: Easy wide pair, 4 Dm.  -92% PRO, it is not binary.

20h 40m 17.64s +03° 26' 28.5" P.A. 84.00 sep 16.8 mag 7.06,10.20 Sp K0 dist. 251.26 pc (819.61 l.y.)

STT 533 AB: 508; 850x: Seems elongated but can't tell for certain.  Viewed through eyepiece cap peephole.  Pulls up as binary in SkyTools, but there is no designation in WDS.

STTA213 AB: 508; 140x: 3 Dm, very wide. 37% PRO, 3,316 AU WS, 1.5+0.8 Msol, but RVD 2.1 > EV 1.1, it is not binary.

20h 59m 50.85s +16° 49' 27.6" P.A. 36.00 sep 70.9 mag 6.66,9.22 Sp F4III dist. 48.1 pc (156.9 l.y.)

20 august 2024

Observed with the 6-inch.  High haze and the seeing wasn't very good, but ok enough at high elevations to get some good results.  Ended the night with views of Saturn and the moon, both good at low power but they were still low to the horizon.

A   382 AB: 152; 250x: Very closely split, >2 Dm, very challenging pair.  Surprisingly, -37% PRO, it is not binary.

20h 08m 01.18s +42° 23' 06.0" P.A. 96.00 sep 1.7 mag 7.21,9.49 Sp K0 dist. 200.4 pc (653.7 l.y.)

AC   12 AB: 152; 250x: Split with 125x but best seen 250x, closely split, half delta magnitude, dull white stars, nice pair.  24% PRO, 161 AU WS, 1.8+1.5 Msol, it might be binary and needs an orbit tried.

19h 58m 22.77s -02° 13' 54.4" P.A. 298.00 sep 1.6 mag 7.54,8.32 Sp F5 dist. 100.6 pc (328.16 l.y.)

AC   17 AB: 152; 250x: Bright light-yellow A, extremely faint B is well separated and appears with best seeing as a very small point.  Excellent telescope contrast helps to detect B. 50% PRO, 462 AU WS, 2.7+0.9 Msol, it is possibly binary and needs an orbit tried.

20h 12m 31.73s +51° 27' 49.0" P.A. 82.00 sep 4.4 mag 6.17,10.55 Sp K2.5III dist. 106.16 pc (346.29 l.y.)

BU   56 AB: 152; 250x: Excellent pair, light orange stars, 2 Dm, very closely split. 2% PRO, 101 AU WS, 1.1+1.3 Msol, it is somewhat possible to be binary, an orbit should be tried.  Burnham thought it "probably fixed."

20h 05m 07.26s -04° 18' 29.3" P.A. 189.00 sep 1.3 mag 8.01,9.10 Sp F5 dist. 77.46 pc (252.67 l.y.)

BU  266 AB: 152; 200x: B appears with averted vision then can hold with foveal coaxing, white, wide, 3 Dm. 17% PRO, 2,874 AU WS, 2.3+1.0 Msol, but the RVD 3.3 > EV 1.4, it is not binary.

19h 57m 56.15s +11° 24' 53.0" P.A. 166.00 sep 15.8 mag 7.57,11.50 Sp A3 dist. 198.41 pc (647.21 l.y.)

BU 1475 AB: 152; 200x: Red AB is well separated, 1 Dm, and points in the general direction of the white C star, which itself has a very faint, 3 Dm close companion.  AB: 66% PRO, 6,920 AU WS, 5.1+3.1 Msol, and RVD 2.6 > EV 1.5, it is not binary.  CD -88% PRO, it is not binary.

AB: 19h 57m 53.70s -09° 03' 30.3" P.A. 113.00 sep 10.4 mag 7.77,9.47 Sp K2 dist. 247.52 pc (807.41 l.y.)

CD: 19h 58m 00.46s -09° 04' 26.7" P.A. 163.00 sep 4.9 mag 8.70,11.10 Sp K0

H 1  93 AB: 152; 250x: Split 125x but better seen 250x.  1 Dm, very close split. 60% PRO, 614 AU WS, 3.0+2.6 Msol, it is possibly binary and needs an orbit tried.

20h 01m 39.17s -00° 11' 56.5" P.A. 297.00 sep 1.8 mag 7.67,8.39 Sp A0 dist. 165.84 pc (540.97 l.y.)

HJ 5168 AB: 152; 125x: Faint B, wide, 3 Dm.  92% PRO, 4,492 AU WS, 3.6+1.3 Msol, but RVD 4.8 > EV 1.4, it is not binary.

20h 07m 23.81s -29° 43' 14.9" P.A. 79.00 sep 18.8 mag 6.85,10.30 Sp K2IV dist. 230.95 pc (753.36 l.y.)

STF2533 AB: 152; 125x: 2 Dm, wide, also seen with 60mm 40x.  -97% PRO, they are not binary.

19h 30m 04.70s -00° 26' 41.8" P.A. 212.00 sep 22.1 mag 7.37,9.98 Sp A3V dist. 114.03 pc (371.97 l.y.)

BU 655 AB: 152; 250x: Component of STF2549  The Struve system is a slightly arced string of three stars with a fainter AC in the middle, near-equal AD at either end.  A is reddish color.  These three also seen with the 60mm 40x.  With 250x and averted vision, I can see the very faint BU 655 AB appear closely separated from A.  AB is -1% PRO, 702 AU WS, there is some chance it's binary and an orbit should be tried.  AC and AD do not share any parallax range and are not binary.

AB: 19h 31m 12.30s +63° 18' 52.5" P.A. 328.00 sep 2.1 mag 8.34,12.00 Sp K0 dist. 467.29 pc (1524.3 l.y.)

STF2596 AB: 152; 200x: Split at 125x, but better seen 200x, lovely cream white A and close 1 Dm light yellow B.  -24% PRO, they are not binary in spite of the SOC grade 4 orbit.

19h 54m 01.95s +15° 17' 31.7" P.A. 297.00 sep 2.1 mag 7.29,8.68 Sp F8V dist. 82.58 pc (269.38 l.y.)

STF2613 AB: 152; 125x: Slightly unequal close white stars, nice pair, also seen in 60mm at 40x.  69% PRO, 293 AU WS, 1.5+1.4 Msol, it is likely binary.  SOC grade 4 orbit, 2106-year period. 

20h 01m 26.66s +10° 44' 54.8" P.A. 354.00 sep 3.5 mag 7.48,8.02 Sp F5V+F5V dist. 80.58 pc (262.85 l.y.)

STF2621 AB: 152; 125x: Slightly unequal, well split.  63% PRO, 2,559 AU WS, 2.9+2.8 Msol, and RVD 0.2 < EV 2.0, it is likely binary and needs an orbit.

20h 04m 34.52s +09° 14' 24.2" P.A. 224.00 sep 5.7 mag 8.36,8.62 Sp B8V+A1V dist. 228.83 pc (746.44 l.y.)

STF2625 AB: 152; 125x: Faint near equal pair.  -93% PRO, it is not binary.

20h 06m 45.79s -12° 55' 37.2" P.A. 4.00 sep 12.1 mag 7.78,10.24 Sp K0III dist. 452.49 pc (1476.02 l.y.)

STF2628 AB: 152; 200x: White A and 2 Dm light orange B, closely split.  66% PRO, 120 AU WS, 1.4+0.8 Msol, it is possibly binary and needs an orbit.

20h 07m 50.37s +09° 23' 59.4" P.A. 338.00 sep 3.0 mag 6.60,8.66 Sp F3V dist. 39.37 pc (128.42 l.y.)

STF2634 AB: 152; 125x: 2 Dm, well split.  1% PRO, 107 AU WS, 0.9+0.6 Msol, and RVD 1.4 < EV 4.9, it is possibly binary and needs an orbit.

20h 09m 34.30s +16° 48' 19.2" P.A. 13.00 sep 4.1 mag 7.77,9.92 Sp K0 dist. 23.66 pc (77.18 l.y.)

STF2635 AB: 152; 125x: White stars, >3Dm, well split.  -16% PRO, and RVD 3.4 > EV 3.0, it is not binary.

20h 10m 07.83s +08° 26' 37.8" P.A. 80.00 sep 7.7 mag 6.66,10.19 Sp F7V dist. 62.74 pc (204.66 l.y.)

STF2637 AB: 152; 125x: >1Dm, well split white stars in a rich field. 5% PRO, 519 AU WS, 1.5+0.9 Msol, it is possibly binary and needs an orbit.

20h 09m 56.61s +20° 54' 53.2" P.A. 331.00 sep 11.6 mag 6.56,8.85 Sp F3V dist. 45.25 pc (147.61 l.y.)

STF2675 AB: 152; 125x: Bright A is around 5th magnitude, well separated 3 Dm B.  -3% PRO, 730 AU WS, 3.5+1.5 Msol, it probably is not binary.

20h 08m 53.32s +77° 42' 40.9" P.A. 120.00 sep 7.3 mag 4.39,8.34 Sp B9III dist. 96.53 pc (314.88 l.y.)

STFA 43 AB: 60; 40x:  Albeiro, lovely gold and blue, 2 Dm, wide, very clean at this aperture.  only 6% PRO but with 5% error, 4,028 AU WS, it is not likely binary.

19h 30m 43.29s +27° 57' 34.9" P.A. 54.00 sep 34.6 mag 3.19,4.68 Sp K3II+B9.5 dist. 133.16 pc (434.37 l.y.)

STT 395 AB: 152; 380x: Overlapping disks, notched high and six. Notched elongation at lower powers.  Slightly unequal, blue-white.  No Gaia parallax data.  SOC grade 4 orbit, 1201-year period.

20h 02m 01.45s +24° 56' 16.8" P.A. 129.00 sep 0.7 mag 5.83,6.19 Sp F2III dist. 67.98 pc (221.75 l.y.)

STTA198 AB: 152; 125x: Super wide near equal white stars.  They are over a stream of faint Milky Way stars, which I can still sense in spite of the light pollution and just past full rising moon. -54% PRO, it is not binary.

20h 06m 38.76s +07° 34' 34.2" P.A. 185.00 sep 64.6 mag 7.12,7.55 Sp A2V+A3V dist. 110.99 pc (362.05 l.y.)

6 august 2024

A good night with the 6-inch.  Seeing forecast to be average but with the 6-inch I got excellent images keeping the scope toward zenith.  Very pleased with the results, had some very high magnifications used.

BU 60 AB: 152; 250x: 3 Dm yellow-white stars, nicely split.  60% PRO, 712 AU WS, 4.2+2.0 Msol, it is likely binary and needs an orbit.

20h 27m 19.20s -18° 12' 42.1" P.A. 148.00 sep 3.5 mag 5.13,8.53 Sp B8II-III dist. 167.22 pc (545.47 l.y.)

BU 63 AB: 152; 570x: B appears as a brightening in A's diffraction at 250x, with 380x it is more separate, 570x pushes them far enough apart to clearly split, 2 Dm.  Surprisingly, -57% PRO, it is not binary.

20h 30m 17.95s +10° 53' 45.3" P.A. 347.00 sep 0.9 mag 6.20,8.02 Sp Be+B dist. 227.79 pc (743.05 l.y.)

BU 65 AB: 152; 250x: B appears immediately a little outside A's diffraction ring, white and pale white, 3 Dm.  -45% PRO, it is not binary.

20h 47m 48.33s +06° 00' 29.5" P.A. 200.00 sep 1.5 mag 5.64,8.24 Sp A0V dist. 131.41 pc (428.66 l.y.)

BU 67 AB: 152; 250x: B hardens to a point on A's diffraction ring in best seeing and careful looking.  3Dm.  -8% PRO, 181 AU WS, 2.2+1.1 Msol, it is borderline to be binary, an orbit should be tried.

20h 50m 36.05s +30° 54' 45.7" P.A. 311.00 sep 1.5 mag 6.85,9.87 Sp A8III dist. 120.05 pc (391.6 l.y.)

BU 152 AB: 152; 250x: 1 Dm or more, yellow-orange stars very closely split.  -25% PRO, 168 AU WS, 2.2+1.6 Msol, it is not likely binary, despite the SOC grade 4 orbit.

20h 42m 16.81s +57° 23' 07.4" P.A. 82.00 sep 1.2 mag 7.21,8.80 Sp A4IV dist. 152.44 pc (497.26 l.y.)

BU 155 AB: 152; 380x: Hairline split with best seeing, unequal, blue-white stars. No Gaia parallax data for the secondary.  There is a SOC grade 5 orbit, 739-year period, time will tell if it's correct.

20h 51m 05.41s +51° 25' 01.7" P.A. 40.00 sep 0.7 mag 7.36,8.13 Sp A9IV dist. 124.53 pc (406.22 l.y.)

HO 128 AB: 152; 250x: Very delicate, light orange bright A.  Close split B is very faint, 2 Dm, and is on the inside of A's diffraction ring.  59% PRO, it is not binary.

20h 22m 55.49s +42° 59' 00.4" P.A. 357.00 sep 1.4 mag 6.41,8.82 Sp G8III dist. 102.99 pc (335.95 l.y.)

SHJ 323 AB: 152; 200x: Light yellow orange stars, close split, 2 Dm.  3% PRO, 40 AU WS, 1.7+1.1 Msol, it is possibly binary.  SOC grade 4 orbit, 376-year period.

20h 28m 51.62s -17° 48' 49.2" P.A. 189.00 sep 1.7 mag 4.97,6.88 Sp F3V dist. 30.27 pc (98.74 l.y.)

SHJ 324 AB: 60; 40x: Bright pair, half delta magnitude, wide.  54% PRO, 1,563 AU WS, 2.1+1.7 Msol, it is possible they are binary and an orbit should be tried.

20h 29m 53.91s -18° 34' 59.4" P.A. 238.00 sep 22.0 mag 5.91,6.68 Sp A3Vn+A7V dist. 32.03 pc (104.48 l.y.)

STF2666 AB: 152; 200x: Nice close split, light-yellow stars, split from 125x-250x.  Also very closely split with the 60mm at 90x, can hold B after foveal coaxing and having seen it in the 6-inch.  32% PRO, 2,749 AU WS, 7.6+4.8 Msol, it is likely binary and needs an orbit.

20h 18m 06.99s +40° 43' 55.6" P.A. 245.00 sep 2.8 mag 5.96,8.24 Sp O9IV+B1.5 dist. 595.24 pc (1941.67 l.y.)

STT 408 AB: 152; 250x: ! Beautiful, excellent pair. White A and blue B, 2 Dm, close separation, like a diamond ring.  -37% PRO, it is not binary.  

20h 34m 01.96s +34° 40' 44.4" P.A. 193.00 sep 1.6 mag 6.75,9.37 Sp B7V dist. 332.23 pc (1083.73 l.y.)

STT 410 AB: 152; 250x: Excellent equal white stars, hairline split but steady.  -28% PRO, they probably are not binary.

20h 39m 33.31s +40° 34' 46.8" P.A. 3.00 sep 0.9 mag 6.73,6.83 Sp B8IIIpMn dist. 283.29 pc (924.09 l.y.)

STT 413 AB: 152; 760x: At this high magnification the disks are swelled and look like blue Galilean moons! Clean split at this power, hairline at lower powers.  Because of their brightness I needed the highest powers to push the disks apart.  19% PRO, 238 AU WS, 5.0+3.7 Msol, it is probably binary.  SOC grade 4 orbit 800-year period. 

20h 47m 24.53s +36° 29' 26.7" P.A. 1.00 sep 0.9 mag 4.73,6.26 Sp B5Ve dist. 235.85 pc (769.34 l.y.)

STT 414 AB: 152; 125x: 1 Dm, wide.  27% PRO, 4,686 AU WS, 3.8+2.7 Msol, it is likely binary and needs an orbit.

20h 47m 09.92s +42° 24' 35.4" P.A. 95.00 sep 9.9 mag 7.43,8.93 Sp B7V dist. 353.36 pc (1152.66 l.y.)

STT 418 AB: 152; 250x: Equal orange stars, very close split with 250x, suspected double at 125x.  Very faint, very slow satellite moved through field during the observation. -52% PRO, it is not binary in spite of the SOC grade 4 orbit.

20h 54m 49.84s +32° 42' 23.2" P.A. 283.00 sep 0.9 mag 8.23,8.27 Sp G0 dist. 60.72 pc (198.07 l.y.)

STT 419 AB: 152; 200x: White A and 2 Dm, very closely split B. 16% PRO, 333 AU WS, 2.5+1.4 Msol, there is some chance it's binary and an orbit should be tried.

20h 54m 42.00s +37° 04' 25.3" P.A. 24.00 sep 1.7 mag 7.20,9.97 Sp A0 dist. 193.8 pc (632.18 l.y.)

STT 423 AB: 152; 200x: 2 Dm white stars, close split.  46% PRO, 1,239 AU WS, 4.0+2.3 Msol, it is likely binary and needs an orbit.

20h 55m 17.96s +42° 30' 48.6" P.A. 76.00 sep 2.7 mag 7.12,9.64 Sp B9 dist. 418.41 pc (1364.85 l.y.)

STU 13 AB: 152; 125x: >1 Dm, white, wide.  -25% PRO, it is not binary.

20h 34m 56.52s +41° 43' 04.1" P.A. 196.00 sep 27.2 mag 7.57,10.13 Sp B9

08 august 2024

Opened up the 20-inch since I hadn't used it in a while.  Seeing was not very good but it was usable at higher elevations.  Used both full aperture and 7-inch mask.  I was shut down after just an hour when the cold marine layer moved overhead.

BU  627 A-BC: 178; 280x: 52 Her.  Bright white star with a fine faint B, 3 Dm, well split around 2".  BC is A 1866 9.5/9.6 0.3" not tried for (a rare case where Aitken beat Burnham to spot a double).  No parallax for BC.  A-BC has a grade 5 orbit but BC is more likely to be binary, and indeed has a grade 3 orbit of 56.4-year period.  

16h 49m 14.21s +45° 58' 59.9" P.A. 44.00 sep 2.2 mag 4.84,8.45 Sp A1V dist. 55.25 pc (180.23 l.y.)

AC 7 STF2220 AB: 178; 200x: ! Component of STF220, which is a 3.5 magnitude light orange star with a 10th magnitude wide companion.  This is BC, which while faint was resolved at 1" separation to an close unequal pair.  Brightens slightly with averted vision, the star images were cleaner with the 7-inch than full aperture.  PA to the NE, it's faint white pair near equal but nice close split.  SOC grade 1 orbit, 43.46-year period, it will be due east by 2040.  4% PRO, only 29 AU WS, 0.3+0.3 Msol, very interesting pair.

17h 46m 25.07s +27° 43' 01.4" P.A. 27.00 sep 1.0 mag 10.20,10.70 Sp M2.2V+M4V

STF2215 AB: 508; 200x: Split with seeing, 2 Dm, white stars, PA SSW.  No Gaia data for the secondary, SOC grade 4 orbit, 1062-year period, time will tell if it's binary.

17h 47m 08.05s +17° 41' 49.2" P.A. 249.00 sep 0.4 mag 6.02,6.89 Sp A1V dist. 143.06 pc (466.66 l.y.)

STT 338 AB: 178; 280x: Better resolved in the 7-inch's cleaner disks, light orange stars, clean close split, 1 Dm.  34% PRO, 154 AU WS, 2.7+2.7 Msol, it is binary.  SOC grade 4 orbit, 1276-year period.

17h 51m 58.46s +15° 19' 34.9" P.A. 168.00 sep 0.9 mag 7.21,7.38 Sp G8III dist. 234.19 pc (763.93 l.y.)

01 august 2024

Uncovered the 6-inch last night, in spite of a hazy sky.  The seeing was quite good, 7/10 or better, though the haze became thin cloud after 10pm.  Chased after more CDSA pairs, a few of which were fantastic challenges.  A very satisfactory night.

STT 426 B: 152; 250x: Bright white A, faint B closely split.  -5% PRO, it is not likely binary.

21h 01m 10.93s +46° 09' 20.8" P.A. 159.00 sep 2.9 mag 5.40,9.53 Sp B1Ve dist. 467.29 pc (1524.3 l.y.)

STF2624 AB: 152; 200x: Lovely close pair, nearly 1 Dm, light yellow stars split at 125x but best seen at 200x, in a rich star field.  22% PRO, 4,020 AU WS, 7.7+8.6 Msol, it might be binary and an orbit should be tried.

20h 03m 29.42s +36° 01' 28.6" P.A. 174.00 sep 1.9 mag 7.09,7.73 Sp O9.5IIIe dist. 862.07 pc (2812.07 l.y.)

SHJ 316 AB: 60; 24x: Bright pair in a rich star field. 0% PRO, and an absurdly large 136,820 AU WS, it is not binary.

20h 05m 39.80s +35° 36' 28.1" P.A. 323.00 sep 69.4 mag 7.79,8.82 Sp O7IIIe dist. 487.8 pc (1591.2 l.y.)

SHJ 315 AD: 60; 24x:  Bright pair in a rich star field.  17% PRO, too-wide 38,237 AU WS, it is not binary.

20h 06m 01.36s +35° 45' 55.9" P.A. 236.00 sep 20.2 mag 7.89,8.73 Sp B5n

STT 394 AB: 152; 125x: 3 Dm pair, well separated.  28% PRO, 2,011 AU WS, 2.8+1.2 Msol, it is possibly binary and an orbit should be tried.

20h 00m 11.43s +36° 24' 50.8" P.A. 294.00 sep 11.0 mag 7.14,10.27 Sp K1III dist. 218.34 pc (712.23 l.y.)

STF2609 AB: 152; 200x: Pale white A and light orange B, split at 125x, but better seen at 200x, 1 Dm.  Hairline split with 60mm at 90x.  3% PRO with 1.4% error, 660 AU WS, 3.8+3.0 Msol, there is a slight chance it's binary and an orbit can be tried.

19h 58m 34.37s +38° 06' 20.8" P.A. 21.00 sep 1.9 mag 6.69,7.64 Sp B5IV dist. 440.53 pc (1437.01 l.y.)

STT 390 AB: 152; 125x: 2 Dm, white, well separated.  8% PRO, 3,285 AU WS, 3.9+1.9 Msol, there is a slight chance it's binary and an orbit can be tried.

19h 55m 06.50s +30° 11' 41.6" P.A. 22.00 sep 9.6 mag 6.63,9.50 Sp B6V+A5V dist. 262.47 pc (856.18 l.y.)

STF2583 AB: 152; 250x: ! Excellent pair, closely split unequal, split 125x but best seen 250x.  -67% PRO, it is not binary.

19h 48m 42.05s +11° 48' 57.3" P.A. 104.00 sep 1.4 mag 6.34,6.75 Sp A3V+F9III dist. 157.73 pc (514.52 l.y.)

STF2562 AB: 152; 125x: 2 Dm, wide.  48% PRO, 1,660 AU WS, 1.6+1.0 Msol, and RVD 1.7 = EV 1.7, there is a chance it's binary and an orbit should be tried.

19h 42m 45.86s +08° 22' 57.5" P.A. 251.00 sep 27.2 mag 6.95,8.69 Sp F8V+G0V dist. 66.45 pc (216.76 l.y.)

D 20 AB: 152; 250x: ! Close and difficult pair, high power only.  B appears as a haze but sharpens to a point with foveal coaxing and I can hold it direct.  There is also a 3rd star C of similar magnitude but wider separation at 90-degrees PA, seen with averted vision.  No Gaia parallax data for B, and C does not overlap parallax ranges.  Given the great distance to the primary, it's not likely to be binary with an >1" separated companion.

19h 31m 15.78s -02° 06' 36.7" P.A. 65.00 sep 1.3 mag 7.22,9.58 Sp B5V dist. 7142.86 pc (23300.01 l.y.)

STF2540 AB: 152; 125x: White stars, well separated, 2 Dm.  -28% PRO, it is not binary.

19h 33m 17.05s +20° 24' 50.5" P.A. 147.00 sep 5.4 mag 7.52,9.23 Sp A3 dist. 152.67 pc (498.01 l.y.)

STF2543 AB: 152; 200x: Bright light-yellow A, but B is seen only with averted vision, well separated.  -94% PRO, it is not binary.

19h 36m 12.61s +06° 00' 26.7" P.A. 151.00 sep 11.5 mag 6.76,10.45 Sp G8III dist. 201.61 pc (657.65 l.y.)

SEI 647 AC: 152; 125x:  In a string of three very wide 8-9th magnitude stars.  Wide, 3 Dm pair.  41% PRO, 13,876 AU WS, 3.3+1.5 Msol, but RVD 2.9 > EV 0.8, it is not binary.  

19h 36m 21.91s +35° 40' 39.7" P.A. 177.00 sep 27.7 mag 8.10,11.66 Sp A0

STT 378 AB: 152; 250x: Excellent pair, 1 Dm, closely split.  -11% PRO, it is not binary.

19h 36m 32.28s +41° 00' 35.1" P.A. 285.00 sep 1.4 mag 7.74,8.92 Sp A0 dist. 354.61 pc (1156.74 l.y.)

STF2545 AB: 152; 125x: Nearly 2 Dm, nicely split.  Also seen with 60mm at 90x.  69% PRO, 336 AU WS, 1.9+1.2 Msol, it is likely binary and needs an orbit.

19h 38m 43.36s -10° 09' 23.7" P.A. 326.00 sep 3.7 mag 6.79,8.54 Sp A9III dist. 86.28 pc (281.45 l.y.)

S 722 AB: 60; 24x: Near equal white stars, well split.  47% PRO, 1,030 AU WS, 1.8+1.8 Msol, and RVD 0.1 < EV 2.5, it is very likely binary and needs an orbit.

19h 39m 12.97s -16° 54' 28.3" P.A. 236.00 sep 10.3 mag 7.17,7.45 Sp A8III+A8V dist. 88.89 pc (289.96 l.y.)

HJ 599 AC: 152; 125x: Beautiful light-yellow A and wide, 2 Dm B, also seen with 60mm 24x. 26% PRO, 3,534 AU WS, 2.7+1.3 Msol, but RVD 3.4 > EV 1.4, it is not binary.

19h 40m 43.34s -16° 17' 35.3" P.A. 41.00 sep 45.5 mag 5.42,7.65 Sp K2III+F8V dist. 73.75 pc (240.57 l.y.)

STFA 45 AB: 60; 24x: Wide white 1 Dm.  -71% PRO, it is not binary.

19h 43m 03.26s -08° 18' 26.2" P.A. 145.00 sep 96.3 mag 7.11,7.56 Sp F4V+F5V dist. 72.2 pc (235.52 l.y.)

STF2579 AB: 152; 200x: ! Excellent close pair, very bright A and faint B resolves outside A's first diffraction ring at 200x & 250x.  I also see it in the 60mm scope at 90x, but only with foveal coaxing and because I already knew where to look after seeing it in the 6-inch.  The refractor and small aperture suppress the bright star's diffraction and provides the contrast needed to see the companion.  No Gaia data for the secondary.  SOC grade 4 orbit, 657-year period.

19h 44m 58.44s +45° 07' 50.5" P.A. 213.00 sep 2.7 mag 2.89,6.27 Sp B9.5IV dist. 50.58 pc (164.99 l.y.)

BU 467 AB: 152; 200x: Faint, closely separated B seen averted vision through thin cloud.  63% PRO, 327 AU WS, 1.7+0.9 Msol, it is probably binary and needs an orbit.

19h 46m 30.41s -21° 31' 22.9" P.A. 137.00 sep 3.7 mag 7.68,9.91 Sp kA8hF1mF3 dist. 96.71 pc (315.47 l.y.)

STF2580 AB: 152; 125x: Bright light orange A and wide B, also seen with 60mm 24x.  22% PRO, 547 AU WS, 1.4+0.7 Msol, but RVD 2.9 > EV 2.6, it is not binary.

19h 46m 25.60s +33° 43' 39.3" P.A. 68.00 sep 25.9 mag 5.06,9.25 Sp F5V dist. 21.23 pc (69.25 l.y.)

STF2590 AB: 152; 125x: Faint wide B seen with foveal coaxing.  19% PRO, 6,246 AU WS, 4.7+1.8 Msol, it is possible, given the mass, it is binary, and an orbit can be tried.

19h 52m 15.58s +10° 21' 05.8" P.A. 308.00 sep 13.6 mag 6.50,10.31 Sp B7V dist. 325.73 pc (1062.53 l.y.)

DJU   4 AB: 152; 250x: ! Incredible pair, very bright A, B is resolved and in best seeing becomes a small faint hard point, 3 Dm, on A's first diffraction ring.  Quite an excellent pair.  Shockingly there is -16% PRO with 0.9% error, so in spite of the 132 AU WS and 3.4+1.8 Msol, it is probably not binary, regardless of the SOC grade 5 orbit.

19h 53m 27.69s +24° 04' 46.6" P.A. 248.00 sep 1.5 mag 4.63,7.37 Sp B9.5III dist. 102.56 pc (334.55 l.y.)