24 july 2023

Seeing predicted to be average, but it was noticeably a problem even in the 6-inch, so I could not push powers very high or go below 1".  Went through more Struves and had a nice night out, with some notable color pairs.

STF2272 AB: 152; 125x: 70 Oph.  Amazing colors, A light yellow, B orange, 2 Dm, well split.  Also seen with 60mm at 40x, the colors were the same but less vivid, but perfect spurious disks, a very pleasing view.  SOC grade 1 orbit, 88.39-years.  15% PRO, 28 AU WS, 0.9+0.6 Msol, RVD 1.2 < EV 9.7.

18h 05m 27.37s +02° 29' 59.3" P.A. 121.00 sep 6.9 mag 4.22,6.17 Sp K0V+K4V dist. 5.08 pc (16.57 l.y.)

STF2262 AB: 152; 200x: Tau Oph.  Suspected at 125x, close split with 200x, A is light orange and B dull white, 1 Dm.  No parallax data for the secondary.

18h 03m 04.91s -08° 10' 48.9" P.A. 291.00 sep 1.4 mag 5.27,5.86 Sp F4IV+F5V dist. 51.33 pc (167.44 l.y.)

STF2265 AB: 152; 125x: Unequal, faint, wide.  -77% PRO, it is not binary.

18h 04m 05.20s +06° 27' 36.6" P.A. 282.00 sep 23.5 mag 9.91,10.59 Sp G5III

STF2266 AB: 152; 125x: Bright A and faint wide B.  -88% PRO, it is not binary.

18h 04m 21.87s +03° 29' 05.0" P.A. 187.00 sep 8.7 mag 7.94,9.57 Sp F5

STF2276 AB: 152; 125x: Near equal light yellow-orange stars, well split.  Split in the 60mm too at 40x.  46% PRO, 1,193 AU WS, 2.5+2.3 Msol, it is possibly binary and needs an orbit.

18h 05m 43.30s +12° 00' 13.9" P.A. 257.00 sep 7.1 mag 7.09,7.44 Sp A7p dist. 138.12 pc (450.55 l.y.)

STF2281 AB: 152; 200x: 73 Oph.  Very subtle elongation with barely perceived notches, large magnitude difference, high power only.  SOC grade 3 orbit, 294-years.  No Gaia parallax data for the primary, and the secondary is not listed.

18h 09m 33.86s +03° 59' 35.8" P.A. 282.00 sep 0.8 mag 5.97,7.52 Sp F2V dist. 54.79 pc (178.72 l.y.)

STF2285 AB: 152; 200x: Needed high power to push the two faint stars far enough apart to resolve, significant delta magnitude, B brightens with averted vision.  93% PRO, 1,963 AU WS, 3.0+2.2 Msol, it is likely binary and needs an orbit.

18h 09m 15.12s +13° 29' 06.2" P.A. 333.00 sep 3.6 mag 8.75,9.82 Sp A0 dist. 1408.45 pc (4594.36 l.y.)

STF2286 AB: 150x: Very fine, B seen with averted vision closely split, then can hold directly as a very small point, 2 Dm, closely separated from the primary.  -19% PRO, so in spite of the 549 AU WS, it is probably not binary.

18h 10m 23.97s +00° 32' 36.1" P.A. 315.00 sep 3.0 mag 8.10,10.27 Sp A1V dist. 166.11 pc (541.85 l.y.)

STF2287 AB: 152; 125x: Faint, near equal, very wide.  -81% PRO, it is not binary.

18h 10m 20.63s +02° 35' 10.1" P.A. 153.00 sep 22.9 mag 10.51,10.78 Sp M3

STF2288 AB: 152; 125x: Wide, very faint.  5% PRO, 6,561 AU WS, 2.6+1.4 Msol, not likely binary.

18h 10m 23.26s +02° 31' 46.2" P.A. 58.00 sep 15.9 mag 8.73,10.90 Sp A0

STF2289 AB: 152; 200x: Light orange stars, nearly 1 Dm, split best high power.  Seen as elongated in the 60mm at 90x.  31% PRO, 406 AU WS, 3.3+4.1 Msol, it is likely binary.  SOC grade 4 orbit 1958-year period.

18h 10m 08.69s +16° 28' 35.0" P.A. 217.00 sep 1.2 mag 6.65,7.21 Sp A0V+G0III dist. 263.85 pc (860.68 l.y.)

STF2294 AB: 152; 200x: Faint near equal light orange stars, split with seeing.  46% PRO, 108 AU WS, 1.4+1.3 Msol, it is very likely binary, and SOC has a grade 4 orbit, 344-year period. 

18h 14m 33.68s +00° 10' 32.9" P.A. 93.00 sep 1.3 mag 8.22,8.55 Sp F2 dist. 114.42 pc (373.24 l.y.)

STF2311 AB: 152; 125x: Near equal faint pair, both stars seen and split with averted vision.  -68% PRO, it is not binary.

18h 22m 14.28s +11° 26' 00.7" P.A. 84.00 sep 3.0 mag 9.65,10.79 Sp K5 dist. 243.31 pc (793.68 l.y.)

STF2322 AB: 152; 125x: Bright white A and several faint stars appearing around it with averted vision, the brightest and closest of which (still wide) is the B star.  -61% PRO, it is not binary.

18h 30m 05.12s +04° 03' 55.3" P.A. 172.00 sep 19.8 mag 6.67,11.28 Sp B2V dist. 507.61 pc (1655.82 l.y.)

STF2329 AB: 152; 125x: 1 Dm, well split, better seen low power in uneven seeing.  -8% PRO, it is not binary. 

18h 31m 26.49s +06° 27' 36.9" P.A. 42.00 sep 4.3 mag 8.16,9.44 Sp B9IV-V dist. 202.02 pc (658.99 l.y.)

STF2331 = STF2329

STF2341 AB: 152; 125x: Nearly 1 Dm, wide.  Also seen in the 60mm at 40x, B with averted vision.  43% PRO, 5,152 AU WS, 2.2+1.7 Msol, it is possibly binary and needs an orbit.

18h 34m 58.11s +11° 26' 32.2" P.A. 265.00 sep 15.4 mag 9.15,10.31 Sp A2V

STF2346 AB: 152; 125x: 1 Dm, very wide.  No Gaia data for the secondary.

18h 37m 15.29s +07° 31' 42.8" P.A. 298.00 sep 30.3 mag 7.93,10.00 Sp G0 dist. 75.08 pc (244.91 l.y.)

STF2355 AB: 152; 125x: Faint near equal, very wide.  -95% PRO, it is not binary.

18h 39m 51.59s +07° 21' 30.9" P.A. 127.00 sep 21.7 mag 6.29,11.68 Sp G8III dist. 147.49 pc (481.11 l.y.)

STF2379 AB: 152; 125x: Crisp and pretty 1 Dm white A and light-yellow B, seen low power in 60mm too. 74% PRO, 1,162 AU WS, 2.4+1.6 Msol, it is likely binary and needs an orbit.

18h 46m 28.58s -00° 57' 41.9" P.A. 121.00 sep 12.5 mag 5.88,7.02 Sp A2V dist. 111.86 pc (364.89 l.y.)

STF2389 AB: 152; 125x: Faint, very wide.  No Gaia parallax data for the secondary.

18h 47m 56.23s +07° 42' 50.1" P.A. 310.00 sep 31.9 mag 8.86,11.88 Sp A3 dist. 418.41 pc (1364.85 l.y.)

STF2396 AB: 152; 125x: 3 Dm, very wide.  No Gaia data for the secondary.

18h 48m 29.23s +10° 44' 43.6" P.A. 337.00 sep 82.0 mag 8.08,11.25 Sp K0 dist. 16.86 pc (55 l.y.)

STF2402 AB: 152; 200x: Split with seeing, near equal pair.  8% PRO, 329 AU WS, 1.9+1.8 Msol, it is likely binary.  SOC grade 5 orbit 1191-year period.  

18h 49m 44.14s +10° 40' 35.4" P.A. 208.00 sep 1.5 mag 8.94,9.27 Sp A3

STF2404 AB: 152; 125x: ! Gorgeous light orange stars, 1 Dm, close but easy split.  Also split with 60mm at 90x, very nice. -13% PRO, so not likely binary.

18h 50m 45.55s +10° 58' 35.2" P.A. 180.00 sep 3.6 mag 6.92,7.77 Sp K5III+K3 dist. 386.1 pc (1259.46 l.y.)

STF2408 AB: 152; 200x: Very fine split, 1 Dm.  -1% PRO, not likely binary.

18h 51m 58.05s +10° 46' 48.9" P.A. 90.00 sep 2.3 mag 8.47,9.38 Sp A0 dist. 699.3 pc (2281.12 l.y.)

STF2424 AB: 152; 125x: Bright light-yellow A, wide 3 Dm B.  -94% PRO, it is not binary.

18h 59m 05.73s +13° 37' 21.2" P.A. 304.00 sep 20.8 mag 5.32,9.30 Sp F6IV dist. 48.43 pc (157.98 l.y.)

STF2425 AB: 152; 125x: Wide, near equal, also seen in 60mm.  Very rick Milky Way field.  No Gaia data on the secondary.

19h 00m 33.93s -08° 06' 31.8" P.A. 177.00 sep 29.5 mag 7.92,8.64 Sp G5

STF2428 AB: 152; 125x: Very fine pair, nearly 1 Dm, closely split with low power.  -78% PRO, it is not binary.

18h 59m 56.53s +14° 54' 39.9" P.A. 287.00 sep 6.9 mag 8.22,10.31 Sp F2

12 july 2023

Since seeing was predicted to be only average, I used the 6-inch last night.  I started out in Hercules but everything was too near zenith, and Byers 812 doesn't play nice with long refractors pointed at zenith.  So I moved up to Draco and covered a lot of ground there.  Seeing became quite good after 10pm, at least for the small aperture.  I had great views of some pairs with the 60mm, perfect stars.  Anything I can split at low power with the 6-inch I can split at high power with the 60mm.  I'm so happy I added it.

STF2107 AB: 152; 200x: Delicate pair, split, faint, 2Dm, delta faint, suspected double at 125x.  only 2% PRO, but a 92 AU WS, 1.6+1.1 Msol, and SOC has a grade 2 orbit 274-year period, tightening slightly to the SE in the next 30 years.

16h 51m 50.10s +28° 39' 58.7" P.A. 106.90 sep 1.4 mag 6.90,8.50 Sp F5IV dist. 58.41 pc (190.53 l.y.)

STF2051 AB: 152; 150x: Faint wide pair, 1 Dm.  -72% PRO, it is not binary.

16h 29m 25.06s +10° 35' 31.4" P.A. 19.00 sep 13.8 mag 7.68,9.42 Sp G5III dist. 218.82 pc (713.79 l.y.)

STF2056 AB: 152; 125x: Faint near equal pair, well separated.  -57% PRO, it is not binary.

16h 31m 38.54s +05° 26' 01.3" P.A. 313.00 sep 6.9 mag 7.76,9.22 Sp A3 dist. 118.34 pc (386.03 l.y.)

STF2241 AB: 152; 125x: Wide near equal, pretty bright light-yellow stars. 89% PRO, 691 AU WS, 1.7+1.2 Msol, it is likely binary, and there is a SOC grade 5 orbit with a 10,000-year period.  There's no radial velocity data for the companion, so I think the jury is out.

17h 41m 56.36s +72° 08' 55.8" P.A. 14.00 sep 29.6 mag 4.60,5.59 Sp F5IV+F8V dist. 22.84 pc (74.5 l.y.)

STF2179 AB: 152; 125x: Close near, equal, very nicely separated.  38% PRO, 868 AU WS, 1.6+1.4 Msol, and the RVD 0.4 < EV 2.5, it is very likely binary and needs an orbit.

17h 20m 00.29s +72° 35' 01.8" P.A. 210.00 sep 5.2 mag 9.13,9.45 Sp F8

STF2118 AB: 152; 200x: Excellent hairline split with seeing, light yellow-white stars, suspected as double at 150x.  43% PRO, only 76 AU WS, 1.6+1.5 Msol, it is likely binary and needs an orbit.

16h 56m 25.32s +65° 02' 20.6" P.A. 64.90 sep 0.9 mag 7.07,7.30 Sp F2IV dist. 69.93 pc (228.11 l.y.)

STF2054 AB: 152; 200x: Nice! Beautiful hairline split with seeing, appears as a snowman otherwise, significant delta magnitude, light yellow stars, high magnification only.  Unfortunately, there's no parallax data for the secondary, it is probably a binary and an orbit should be tried. 

16h 23m 47.19s +61° 41' 47.0" P.A. 350.00 sep 1.0 mag 6.15,7.09 Sp G8III dist. 155.28 pc (506.52 l.y.)

STF2060 AB: 152; 150x: Near equal, very delicate close split with 125x, better seen 150x. 85% PRO, 1,131 AU WS, 1.7+1.6 Msol, it is probably binary and needs an orbit.

16h 28m 32.06s +56° 44' 07.9" P.A. 247.00 sep 3.8 mag 10.19,10.26 Sp G5 dist. 307.69 pc (1003.68 l.y.)

STF2078 AB: 152; 125x: The AC plus 1 pair is near equal.  AB is a close pair, 1Dm, around 3" split with low power, very pretty.  Also split with the 60mm at 90x, actually looks better than in the 152mm scope.  AB is -29% PRO and is not binary, but AC is 56% PRO, 10,190 AU WS, 3.1+0.3 Msol, and might be binary and needs an orbit.

16h 36m 13.72s +52° 55' 27.8" P.A. 104.00 sep 3.2 mag 5.38,6.42 Sp B9.5V dist. 126.42 pc (412.38 l.y.)

STF2099 AB: 152; 125x: Very faint pair, 1 Dm, well separated.  -53% PRO, it is not binary.

16h 38m 21.31s +70° 20' 18.4" P.A. 216.00 sep 9.8 mag 9.45,10.90 Sp K0

STF2092 AB: 152; 125x: Slightly unequal, wide.  6% PRO, 1,271 AU WS, 1.7+1.3 Msol, there is a remote chance it is binary and an orbit should be tried.

16h 39m 03.98s +60° 41' 58.8" P.A. 5.00 sep 8.2 mag 8.69,9.64 Sp G1IV dist. 118.34 pc (386.03 l.y.)

STF2116 AB: 152; 125x: Near equal, wide.  11% PRO, 4,080 AU WS, 1.7+1.4 Msol, there is a remote chance it is binary and an orbit should be tried.

16h 55m 13.49s +63° 31' 41.6" P.A. 4.00 sep 19.1 mag 9.40,10.12 Sp G5 dist. 81.43 pc (265.62 l.y.)

STF2117 AB: 152; 200x: Very small scale, notched elongation most of the time but I see a hairline split with the best seeing.  High power only, it's among the faintest closest pairs I've ever done.  Amazingly, -47% PRO, it is not binary!

16h 58m 06.11s +51° 47' 40.2" P.A. 92.00 sep 1.4 mag 9.17,10.61 Sp G5

STF2128 AB: 152; 125x: Near equal, wide.  22% PRO, 304 AU WS, 0.7+0.5 Msol, the RVD 1.0 < EV 2.7, it is binary.  SOC grade 5 orbit, 2294-year period.

17h 03m 18.66s +59° 35' 07.3" P.A. 42.60 sep 12.2 mag 8.76,10.34 Sp K4V dist. 24.04 pc (78.42 l.y.)

STF2124 AB: 152; 125x: 1 Dm, wide.  No parallax data for the primary.

16h 59m 19.97s +65° 12' 35.1" P.A. 87.00 sep 14.7 mag 9.26,10.00 Sp F5

STF2126 AB: 152; 125x: Faint, wide, >1 Dm.  -65% PRO, it is not binary.

16h 58m 48.23s +71° 05' 51.5" P.A. 133.00 sep 23.0 mag 9.61,11.23 Sp F5

STF2130 AB: 152; 125x: Very pretty, light yellow-white stars, equal, good split even low power.  Also cleanly split with the 60mm at 90x, and I notice a slight magnitude difference I didn't notice with the 152mm.  63% PRO, 63 AU WS, 1.4+1.4 Msol, SOC grade 3 orbit, 424-year period.  

17h 05m 20.20s +54° 28' 14.3" P.A. 357.30 sep 2.6 mag 5.66,5.69 Sp F7V dist. 27.43 pc (89.48 l.y.)

STF2129 AB: 152; 125x: Faint, unequal, wide.  -96% PRO, it is not binary.

17h 08m 51.86s +69° 25' 10.4" P.A. 206.00 sep 9.8 mag 9.99,10.61 Sp G5

STF2138 AB: 152; 125x: Near equal, very wide.  21% PRO, 471 AU WS, 0.6+0.6 Msol, the RVD 0.3 < EV 2.1, it is very likely binary.  SOC grade 5 orbit, 4478-year period.

17h 10m 10.51s +54° 29' 39.8" P.A. 132.60 sep 22.1 mag 8.99,9.36 Sp K6V+K6V dist. 19.86 pc (64.78 l.y.)

STF2151 AB: 152; 125x: Slightly unequal, well separated. -86% PRO, it is not binary.

17h 11m 16.69s +69° 30' 10.0" P.A. 350.00 sep 2.5 mag 9.83,10.49 Sp F8

STF2146 CD: 152; 150x: Very fine, 1 Dm, split with 125x, better seen 150x.  -37% PRO, it is not binary.

17h 12m 58.23s +54° 07' 28.1" P.A. 225.00 sep 2.8 mag 8.87,10.50 Sp G5

STF2155 AB: 152; 125x: 2 Dm, wide.  59% PRO, 1,560 AU WS, 2.5+1.2 Msol, but the RVD 3.1 > EV 2.1, it is not likely binary.

17h 16m 04.88s +60° 42' 49.7" P.A. 113.00 sep 10.0 mag 6.93,9.97 Sp F3III dist. 182.48 pc (595.25 l.y.)

STF2180 AB: 152; 125x: Nicely resolved, slightly unequal, white stars.  Split with 60mm at 90x.  82% PRO, 355 AU WS, 1.8+1.7 Msol, it is likely binary and needs an orbit.

17h 28m 58.17s +50° 52' 13.0" P.A. 260.00 sep 3.0 mag 7.79,8.06 Sp A7IV dist. 110.99 pc (362.05 l.y.)

STF2199 AB: 152; 125x: Nice close split, near equal white stars.  Hairline split in the 60mm with 90x.  -88% PRO, it is not binary in spite of the SOC grade 4 orbit.

17h 38m 38.32s +55° 45' 34.9" P.A. 53.50 sep 2.0 mag 8.03,8.60 Sp F8V dist. 121.21 pc (395.39 l.y.)

STF2218 AB: 152; 200x: Beautiful close split, reddish B star, 1 Dm.  Split with 125x but best seen with 200x.  -74% PRO, it is not binary.

17h 40m 18.07s +63° 40' 31.4" P.A. 306.80 sep 1.4 mag 7.08,8.37 Sp F8V dist. 68.49 pc (223.41 l.y.)

STF2219 AB: 152; 125x: Unequal, wide, faint.  27% PRO, 11,803 AU WS, 4.0+3.1, the RVD 1.3 > EV 1.0 -- there is some chance it is binary and an orbit should be tried.

17h 41m 17.67s +61° 36' 20.6" P.A. 95.00 sep 17.2 mag 8.59,9.81 Sp K5 dist. 245.7 pc (801.47 l.y.)

STF2225 AB: 152; 125x: Well separated pair, near equal, faint.  19% PRO, 2,379 AU WS, 2.8+1.3 Msol, but the RVD 3.3 > EV 1.8, it is not binary.

17h 45m 10.07s +51° 56' 55.9" P.A. 339.00 sep 5.5 mag 9.00,11.90 Sp K2

 

STF2261 AB: 152; 125x: 2 Dm, well separated.   -59% PRO, it is not binary.  

17h 58m 05.37s +52° 13' 06.0" P.A. 261.00 sep 9.6 mag 7.56,10.02 Sp A2 dist. 113.64 pc (370.69 l.y.)

STF2260 = STF2261

STF2273 AB: 152; 125x: Near equal wide.  31% PRO, 1,417 AU WS, 1.5+1.4 Msol, RVD 0.3 < EV 1.9, it is likely binary and needs an orbit.

17h 59m 13.71s +64° 08' 33.1" P.A. 282.00 sep 21.4 mag 7.31,7.63 Sp F4V+F5V dist. 73.1 pc (238.45 l.y.)

STF2046 AB: 152; 125x: Near equal, wide, faint.  -34% PRO, it is not binary.

16h 20m 53.83s +64° 21' 45.7" P.A. 221.00 sep 8.0 mag 9.73,10.30 Sp F8

STF2045 AB: 152; 125x: Near equal, faint, need 200x to resolve.  31% PRO, 302 AU WS, 1.5+1.1 Msol, it is likely binary and needs an orbit.

16h 20m 18.35s +61° 29' 46.0" P.A. 186.00 sep 2.2 mag 8.80,10.18 Sp F8

STF2009 AB: 152; 125x: Near equal, faint, wide.  -4% PRO, it is not binary.

16h 01m 59.06s +60° 28' 57.3" P.A. 301.00 sep 17.0 mag 9.42,10.71 Sp F8