Observed with the 20-inch because the seeing was to go from good to excellent late in the night. I started out with the 7-inch mask doing Struves as usual. I was frustrated, though, with the power issues I'm having with the scope. It keeps cutting out, likely because of a dirty ground board (never mind I cleaned it just a few months ago). I couldn't get the ServoCat to power up from the battery, so I had to suffer through it. The seeing did get marginally better, and I did get one challenge "movement" pair, but the pointing accuracy was off and I couldn't find some others.
Seeing to be the same tonight but I think I'll observe with the 6-inch refractor, it's easier to use and the pointing accuracy is excellent.
STF1487 AB: 178; 140x: Lovely 1 Dm, light yellow stars, well split. 43% overlap of the parallax ranges, 626 AU weighted separation, 3.4+2.2 Msol, it is likely binary and needs an orbit.
10h 55m 36.80s +24° 44' 59.0" P.A. 112.00 sep 6.6 mag 4.48,6.30 Sp A1V+A2Vn dist. 87.95 pc (286.89 l.y.)
STF1536 AB: 178; 300x: Light yellow and light orange stars, 2 Dm, close split at 140x, best seen at 300x. No Gaia data for the secondary. SOC grade 2 orbit, 184.45-year period, PA is east now and will be NE by 2050 with a slightly wider separation.
11h 23m 55.37s +10° 31' 46.9" P.A. 91.50 sep 2.2 mag 4.06,6.71 Sp F4IV dist. 23.67 pc (77.21 l.y.)
STF1534 AB: 178; 140x: B seen with averted vision at first, then can hold direct, well split. 0% overlap of the parallax ranges, so in spite of the narrow 166 AU weighted separation it is not likely binary.
11h 21m 49.34s +18° 11' 24.0" P.A. 313.50 sep 5.1 mag 8.08,11.14 Sp G5 dist. 31.05 pc (101.29 l.y.)
STF1531 AB: 178; 140x: Wide, noticeable delta magnitude. -17% overlap of the parallax ranges, it is not binary.
11h 20m 43.56s +22° 52' 51.7" P.A. 167.00 sep 23.4 mag 9.35,10.30 Sp G5 dist. 77.64 pc (253.26 l.y.)
STF1521 AB: 178; 140x: White stars, near equal, attractive close split. 7% parallax range overlap, 462 AU weighted separation, 1.9+1.7 Msol, and the radial velocity delta 0.3 is less than the escape velocity 3.7, so this is likely binary and needs an orbit.
11h 15m 20.95s +27° 34' 15.6" P.A. 97.00 sep 3.7 mag 7.66,8.06 Sp A5 dist. 116.28 pc (379.31 l.y.)
STF1511 AB: 178; 140x: Equal white stars, well split. 19% parallax range overlap, 1,157 AU weighted separation, 1.5+1.4 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.1, it is likely binary and needs an orbit.
11h 07m 11.56s +10° 54' 48.2" P.A. 287.00 sep 7.6 mag 9.27,9.50 Sp K0 dist. 221.73 pc (723.28 l.y.)
STF1507 AB: 178; 140x: 1 Dm, well split. -7% overlap of the parallax ranges, it is not binary.
11h 06m 07.42s +07° 02' 00.5" P.A. 165.00 sep 8.5 mag 8.80,10.23 Sp F8 dist. 109.29 pc (356.5 l.y.)
STF1526 AB: 178; 140x: Faint, wide, does not appear to be double. -8% overlap of the parallax ranges, it is not binary.
11h 18m 39.02s +02° 49' 47.2" P.A. 181.00 sep 30.2 mag 10.30,10.33 Sp G0
STF1518 BC: 178; 140x: Faint super wide, does not appear to be double. Did not notice BC, 11.26/11.50 3.5". AB do not share parallax ranges so it is not double. BC share 54% overlap of the parallax ranges, 785 AU weighted separation, 1.1+1.1 Msol, and are likely binary and need an orbit.
11h 14m 29.46s +05° 15' 47.0" P.A. 258.00 sep 106.9 mag 8.14,11.26 Sp K0 dist. 429.18 pc (1399.99 l.y.)
STF1527 AB: 178; 300x: Hairline split with seeing and high power, 1 Dm. No Gaia data for the secondary. SOC grade 3 orbit, 415-year period.
11h 18m 59.91s +14° 16' 06.9" P.A. 305.70 sep 0.5 mag 7.01,7.99 Sp F9V dist. 30.74 pc (100.27 l.y.)
STF1528 AB: 178; 140x: 2 Dm, wide, does not appear to be double. -92% overlap of the parallax ranges, it is not binary.
11h 19m 35.28s +09° 55' 56.9" P.A. 218.00 sep 19.3 mag 8.91,12.30 Sp A3 dist. 318.47 pc (1038.85 l.y.)
STF1529 AB: 178; 140x: Easy, wide, 1 Dm. 21% overlap of the parallax ranges, 467 AU weighted separation, 1.4+1.2 Msol, and the radial velocity delta 0.6 is less than the escape velocity 3.1, it is likely binary and needs and orbit.
11h 19m 22.64s -01° 39' 17.6" P.A. 254.00 sep 9.3 mag 7.10,7.91 Sp F6IV+dG3 dist. 48.12 pc (156.97 l.y.)
STF1530 AB: 178; 140x: 1 Dm, wide. 82% overlap of the parallax ranges, 988 AU weighted separation, 1.6+1.5 Msol, and the radial velocity delta 0.4 is less than the escape velocity 2.3, it is likely binary and needs an orbit.
11h 19m 43.92s -06° 53' 54.8" P.A. 313.00 sep 7.6 mag 8.56,8.91 Sp F2 dist. 194.55 pc (634.62 l.y.)
STF1535 AB: 178; 140x: B seen with averted vision, well split, does not appear to be double, but there is 73% overlap of the parallax ranges, 1,345 AU weighted separation, 1.3+0.8 Msol, though the radial velocity delta 2.1 exceeds the escape velocity 1.7, so it might not be binary but an orbit should be tried.
11h 22m 54.19s +00° 55' 38.9" P.A. 60.00 sep 10.7 mag 9.39,12.00 Sp G0
STF1540 AB: 178; 140x: 1 Dm, very wide. There is -5% parallax range overlap, so in spite of the other data (and the SOC grade 5 orbit), it is not likely binary.
11h 26m 45.32s +03° 00' 47.2" P.A. 146.00 sep 28.6 mag 6.55,7.50 Sp G7V dist. 17.75 pc (57.9 l.y.)
STF1547 AB: 178; 140x: White stars, 1 Dm, wide. -37% parallax range overlap, it is not binary (in spite of the SOC grade 5 orbit).
11h 31m 44.94s +14° 21' 52.2" P.A. 332.20 sep 15.3 mag 6.33,9.14 Sp G0V+G5 dist. 23.33 pc (76.1 l.y.)
STF1537 AB: 178; 200x: Noticeable delta magnitude, close split, seen at 140x, better at 200x. 26% parallax range overlap, 213 AU weighted separation, 1.5+1.2 Msol, it is likely binary and needs an orbit.
11h 24m 28.94s +20° 37' 16.5" sep 2.0 mag 8.23,9.07 Sp G0 dist. 92.59 pc (302.03 l.y.)
STF1549 AB: 178; 140x: 1 Dm, wide. -43% parallax range overlap, it is not binary.
11h 32m 37.03s +24° 19' 23.2" P.A. 113.00 sep 12.8 mag 9.49,11.16 Sp K0
STF1552 AB: 178; 140x: Bright white stars, closely split, 1 Dm, nice. -6% overlap of the parallax ranges, it is not likely binary.
11h 34m 42.50s +16° 47' 48.9" P.A. 209.00 sep 3.1 mag 6.26,7.31 Sp B4V+B9V dist. 581.4 pc (1896.53 l.y.)
STF1554 AB: 508; 850x: Cleanly split, PA on a NW-SW line, very near equal, seems fainter star is to the SW to me. Light orange stars, can tell it is not single at lower powers. No Gaia data for the secondary. SOC grade 4 orbit, 478-year period it will widen ever so slightly by 2050.
11h 36m 06.78s +12° 51' 18.8" P.A. 220.80 sep 0.3 mag 9.44,9.63 Sp G0V+G0/1V dist. 97.56 pc (318.24 l.y.)
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