Observed last night with the 6-inch refractor, in good seeing for it (but not good enough for the 20-inch). Went Struving in Hercules. I'm quite happy with the Nexus DSC, I was landing in the FOV all the time last night, which greatly increased the number of observations I could make. Started at 9:30pm and stopped shortly after 11pm.
STF 1982 AB: 152; 150x: Faint pair, 1 Dm, around 4" separation. WDS says physical, and there is 78% overlap of the parallax ranges, 1,090 AU weighted separation, 1.5+1.4 Msol, so it is likely binary.
15h 49m 51.25s +42° 47' 19.6" P.A. 299.00 sep 4.8 mag 9.95,10.12 Sp F8 dist. 270.27 pc (881.62 l.y.)
STF 1991 AB: 152; 150x: Close split around 3", faint, 1 Dm. WDS says it is physical, but there is no overlap of the parallax ranges -14%, in spite of the low 627 AU weighted separation, it is not likely to be binary.
15h 57m 26.92s +41° 39' 42.9" P.A. 195.00 sep 3.0 mag 9.45,10.41 Sp F5 dist. 178.89 pc (583.54 l.y.)
STF 2001 AB: 152; 150x: Faint pair, 1Dm and very wide companion. WDS uncertain, however there is 90% overlap of the parallax ranges, 2,315 AU weighted separation, 1.4+1.1 Msol, and the radial velocity delta 0.9 is less than the escape velocity 1.4, so this is almost certain to be binary -- need plenty of future measures to confirm.
16h 01m 13.23s +41° 50' 01.7" P.A. 168.00 sep 11.6 mag 10.01,10.98 Sp G
STF 2010 AB: 152; 150x: Very pretty goldenrod colored stars, 2 Dm, wide. Spectral class G7III+K0I (yellow/yellow-orange). WDS says proper motion indicates non-physical, but more telling is there not being any overlap of the parallax ranges, -40%.
16h 08m 04.55s +17° 02' 49.2" P.A. 14.00 sep 26.8 mag 5.10,6.21 Sp G7III+K0I dist. 112.74 pc (367.76 l.y.)
16h 08m 37.85s +40° 03' 11.2" P.A. 91.00 sep 8.4 mag 8.62,10.41 Sp F2 dist. 255.75 pc (834.26 l.y.)
STF 2015 AB: 152; 300x: Blue-white A, closely separated 2 Dm B needed 300x to split. WDS uncertain, but there is 59% overlap of parallax ranges, only 311 AU weighted separation, 1.5+1.2 Msol, so it is likely binary.
16h 08m 54.75s +45° 21' 11.8" P.A. 159.00 sep 3.0 mag 8.24,9.52 Sp F5 dist. 97.56 pc (318.24 l.y.)
STF 2016 AB: 152; 150x: Widely separated around 6", light yellow stars, 2 Dm. WDS calls it physical, but there is barely 1% overlap of the parallax ranges, 1,187 AU weighted separation, 1.7+1.4 Msol, so it should be called uncertain instead.
16h 12m 07.05s +11° 54' 39.2" P.A. 147.00 sep 7.5 mag 8.49,9.60 Sp A3 dist. 172.12 pc (561.46 l.y.)
STF 2017 AB: 152; 150x: White stars, wide, half a delta mag. WDS says it is not physical, and there is no -88% overlap of the parallax ranges, confirming it is not binary.
16h 12m 08.39s +14° 32' 56.0" P.A. 258.00 sep 29.9 mag 8.60,9.13 Sp K2 dist. 322.58 pc (1052.26 l.y.)
STF 2021 AB: 152; 150x: Brilliant white near equal pair, closely split around 3". WDS grade 4 orbit, 949-year period. There is 22% overlap of the parallax ranges, only 101 AU weighted separation, 0.9+0.9 Msol, and the radial velocity delta 0.7 is less than the escape velocity 5.6, so it is certainly binary.
16h 13m 18.45s +13° 31' 37.2" P.A. 358.40 sep 4.0 mag 7.43,7.48 Sp G9V dist. 23.58 pc (76.92 l.y.)
STF 2023 AB: 152; 200x: Very closely separated, 1 Dm white stars. WDS uncertain, but there is 18% parallax range overlap, only 216 AU weighted separation, 1.4+1.2 Msol, so it is likely binary.
16h 14m 30.89s +05° 31' 21.0" P.A. 222.00 sep 1.8 mag 8.70,9.38 Sp F5
STF 2024 AB: 152; 150x: Bright light orange A star, and 5 Dm faint blue B star, wide. An unusual large delta mag pair from Struve. WDS says it's physical, and there is 25% overlap of the parallax ranges, a large 5,377 AU weighted separation, 4.3+1.2 Msol -- given the large mass of the primary is it possible this is binary.
16h 11m 47.60s +42° 22' 28.2" P.A. 44.00 sep 23.6 mag 5.86,10.73 Sp K4III dist. 193.8 pc (632.18 l.y.)
STF 2025 AB: 152; 150x: Nice! White A, very faint B closely separated around 3". WDS says it's physical, but there is borderline 0% overlap of the parallax ranges, only 386 AU weighted separation, 1.9+1.1 Msol, so it is possible it is binary.
16h 11m 11.71s +47° 33' 36.1" P.A. 164.00 sep 2.6 mag 8.03,9.75 Sp F0 dist. 141.64 pc (462.03 l.y.)
STF 2026 AB: 152; 150x: Faint stars, near equal, around 5" separation. WDS grade 3 orbit 433-year period. There is 34% overlap of the parallax ranges, only 89 AU weighted separation, 0.6+0.6 Msol, and the radial velocity delta 0.9 is less than the escape velocity 5.0, so it certainly is binary.
16h 15m 57.07s +07° 21' 24.8" P.A. 15.90 sep 3.6 mag 9.48,9.86 Sp K5 dist. 26.04 pc (84.94 l.y.)
STF 2023 AB: 152; 200x: Very closely separated, 1 Dm white stars. WDS uncertain, but there is 18% parallax range overlap, only 216 AU weighted separation, 1.4+1.2 Msol, so it is likely binary.
16h 14m 30.89s +05° 31' 21.0" P.A. 222.00 sep 1.8 mag 8.70,9.38 Sp F5
STF 2024 AB: 152; 150x: Bright light orange A star, and 5 Dm faint blue B star, wide. An unusual large delta mag pair from Struve. WDS says it's physical, and there is 25% overlap of the parallax ranges, a large 5,377 AU weighted separation, 4.3+1.2 Msol -- given the large mass of the primary is it possible this is binary.
16h 11m 47.60s +42° 22' 28.2" P.A. 44.00 sep 23.6 mag 5.86,10.73 Sp K4III dist. 193.8 pc (632.18 l.y.)
STF 2025 AB: 152; 150x: Nice! White A, very faint B closely separated around 3". WDS says it's physical, but there is borderline 0% overlap of the parallax ranges, only 386 AU weighted separation, 1.9+1.1 Msol, so it is possible it is binary.
16h 11m 11.71s +47° 33' 36.1" P.A. 164.00 sep 2.6 mag 8.03,9.75 Sp F0 dist. 141.64 pc (462.03 l.y.)
STF 2026 AB: 152; 150x: Faint stars, near equal, around 5" separation. WDS grade 3 orbit 433-year period. There is 34% overlap of the parallax ranges, only 89 AU weighted separation, 0.6+0.6 Msol, and the radial velocity delta 0.9 is less than the escape velocity 5.0, so it certainly is binary.
16h 15m 57.07s +07° 21' 24.8" P.A. 15.90 sep 3.6 mag 9.48,9.86 Sp K5 dist. 26.04 pc (84.94 l.y.)
16h 15m 16.64s +04° 15' 46.6" P.A. 81.00 sep 1.9 mag 8.77,8.86 Sp F0 dist. 271 pc (884 l.y.)
STF 2030 AB: 152; 150x: Around 3 Dm wide faint companion to the primary. WDS calls it physical, and there is 27% overlap of the parallax ranges, 1,088 AU weighted separation, 2.2+1.2 MSol, so it is probably binary.
16h 12m 43.21s +40° 46' 54.1" P.A. 239.00 sep 5.7 mag 7.91,10.16 Sp A0 dist. 139.47 pc (454.95 l.y.)
STF 2035 AB: 152; 200x: Nice close pair, B is 2 Dm, split with 150x but better view at 200x. WDS says it's physical, and there is 19% parallax range overlap, 711 AU weighted separation, 1.8+1.4 Msol, and the radial velocity delta 0.6 is less than the escape velocity 2.6, so it is binary.
16h 18m 09.39s +25° 51' 41.2" P.A. 36.00 sep 2.7 mag 9.71,10.90 Sp F5
STF 2037 AB: 152; 300x: Very faint pair, nearly 1 Dm, very closely split around 1" separation. WDS uncertain, and surprisingly there is no overlap of the parallax ranges -62%, so it is not binary.
16h 18m 49.03s +17° 23' 58.3" P.A. 256.00 sep 1.1 mag 9.82,9.86 Sp G5 dist. 167.5 pc (546.38 l.y.)
STF 2038 AB: 152; 200x: B is very faint, at the edge of detection, very wide. WDS uncertain, and there is no overlap -88% of the parallax ranges, it is not binary.
16h 23m 31.48s +02° 12' 52.5" P.A. 213.00 sep 17.6 mag 9.10,11.30 Sp K0 dist. 416.67 pc (1359.18 l.y.)
STF 2040 AB: 152; 150x: White A and 2 Dm wide B. WDS uncertain, but there is 62% overlap of the parallax ranges, 1,201 AU weighted separation, 2.0+1.2 Msol, so it is very likely binary.
16h 23m 05.73s +13° 50' 23.3" P.A. 313.00 sep 7.0 mag 8.11,10.14 Sp F2 dist. 195.69 pc (638.34 l.y.)
STF 2042 AB: 152; 150x: White A, 3 Dm wide B. WDS uncertain, but there is no -94% overlap of the parallax ranges, it is not binary.
16h 25m 50.78s +05° 42' 07.1" P.A. 134.00 sep 9.7 mag 8.59,11.40 Sp F0 dist. 180.83 pc (589.87 l.y.)
STF 2043 AB: 152; 150x: White and extremely fine faint B, well separated. Quite an extraordinary match. WDS says it's physical, but surprisingly there is no parallax range overlap -18%, so it is not likely binary.
16h 25m 26.90s +17° 18' 10.6" P.A. 85.00 sep 10.0 mag 8.03,11.44 Sp G0 dist. 107.07 pc (349.26 l.y.)
STF 2047 AB: 152; 200x: Exquisite pair, near equal, closely split with 150x, better view 200x. WDS says it's physical, and there is 10% parallax range overlap, only 250 AU weighted separation, 1.6+1.6 Msol, so it is likely binary.
16h 23m 08.85s +47° 37' 48.4" P.A. 325.00 sep 1.8 mag 8.54,8.65 Sp F8 dist. 185.53 pc (605.2 l.y.)
STF 2049 AB: 152; 300x: Beautiful pair, cream white A and light blue B, 1 Dm, closely split. WDS uncertain, and there is no parallax range overlap -33%, so it is not binary.
16h 27m 54.63s +25° 59' 03.4" P.A. 195.00 sep 1.1 mag 7.33,8.10 Sp A2.5V dist. 132.8 pc (433.19 l.y.)
STF 2051 AB: 152; 150x: Pretty pair, white A and light blue wide B. WDS says it's physical, but there is no parallax range overlap -72%, it is neither physical nor 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.)
STF 2052 AB: 152; 150x: Very nice light-yellow stars, near equal, around 3" separation. WDS grade 2 orbital solution 229-year period. 38% parallax range overlap, only 40 AU weighted separation, 0.8+0.7 Msol, certainly binary.
16h 28m 52.67s +18° 24' 50.6" P.A. 117.60 sep 2.5 mag 7.69,7.91 Sp K1V dist. 19.66 pc (64.13 l.y.)
STF 2053 AB: 152; 150x: Faint stars, 1 Dm, wide. WDS says they're physical, and unfortunately there is no Gaia parallax data for the secondary.
16h 28m 21.06s +31° 08' 08.9" P.A. 351.00 sep 21.6 mag 9.95,10.84 Sp G0
STF 2056 AB: 152; 150x: White A and light yellow B, 1 Dm, wide. WDS says it's physical, but there is no overlap of the parallax ranges, -57%, so 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.)
STF 2057 AB: 152; 150x: Faint pair, near equal, well split. STF 2058 in the same field. WDS says proper motion indicates physical, and there is 23% overlap of the parallax ranges, 535 AU weighted separation, 0.9+0.9 Msol, but the radial velocity delta 5.5 exceeds the escape velocity 2.5, so it is not, or will not remain, binary.
16h 31m 34.41s +19° 16' 37.9" P.A. 269.00 sep 4.9 mag 10.49,10.63 Sp K0
STF 2058 AB: 152; 150x: Faint stars, more than 1 Dm, B seen with averted vision only, closely split. STF 2057 in the same field. -49% parallax range overlap, it is not binary.
16h 31m 43.32s +19° 18' 36.5" P.A. 352.00 sep 1.8 mag 10.37,10.55 Sp K0
STF 2059 AB: 152; 600x: I want to say I see an elongation, but it is not certain. WDS grade 4 orbital soltuion, 955-year period, and frustratingly there is Gaia data for the B star.
16h 30m 55.71s +38° 03' 52.6" P.A. 173.60 sep 0.2 mag 8.75,8.79 Sp F5 dist. 203.25 pc (663 l.y.)
STF 2061 AB: 152; 300x: Nice! 3 Dm B appears with foveal coaxing only, then can hold direct, very much fainter and closely separated. WDS says it's physical, but surprisingly there is no parallax range overlap -84%, so it cannot be binary.
16h 33m 12.49s +30° 54' 27.0" P.A. 29.00 sep 2.4 mag 7.92,10.44 Sp F2 dist. 121.21 pc (395.39 l.y.)
STF 2062 AB: 152; 200x: Excellent pair, 2 Dm, very closely separated. WDS uncertain, and the parallax ranges just barely touch 0% overlap, but there is only 411 AU weighted separation, 1.6+1.1 Msol, and the radial velocity delta 0.1 is less than the escape velocity 3.4, so it is very likely binary.
16h 34m 44.14s +08° 45' 54.2" P.A. 109.00 sep 2.5 mag 9.07,10.61 Sp G0
STF 2063 AB: 152: 150x: Bright white A and light blue B, 2 Dm, wide. WDS says it's physical, and there is 37% parallax range overlap, 1,156 AU weighted separation, 2.2+1.1 Msol, so it is very likely binary.
16h 31m 47.23s +45° 35' 53.8" P.A. 195.00 sep 16.3 mag 5.69,8.70 Sp A2V dist. 69.3 pc (226.06 l.y.)
STF 2064 AB: 152; 150x: Faint stars, very wide, 1 Dm. WDS uncertain, but there is no -96% parallax range overlap, it is not binary.
16h 34m 34.57s +16° 12' 01.6" P.A. 312.00 sep 70.5 mag 10.76,11.21
STF 2065 AB: 152; 150x: Faint stars, near equal, wide. WDS uncertain, but there is no -95% parallax range overlap, it is not binary.
16h 32m 40.81s +39° 59' 14.1" P.A. 215.00 sep 32.0 mag 9.16,9.68 Sp F2 dist. 389.11 pc (1269.28 l.y.)
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