A pretty good night observing CDSA pairs with the 6-inch refractor. Seeing was choppy early on but was better and improving at higher elevations. Transparency grew worse slowly with increasing marine haze. But still a very enjoyable session, cleaning up unobserved pairs in Bootes, Draco, and Ursa Minor.
SHJ 191 AB: 152; 125x: White, 1 Dm wide pair. Seen with 60mm too. -49% PRO, it is not binary.
14h 59m 34.58s +53° 51' 36.7" P.A. 341.00 sep 40.4 mag 6.86,7.57 Sp F1V+F1V dist. 118.34 pc (386.03 l.y.)
STT 580 AB: 152; 125x: Asellus primus. Bright yellow-white A and very faint wide B, can just hold it with direct vision. 10% PRO, 1,010 AU WS, 1.5+0.3 Msol, but RVD 5.5 > EV 1.8, it is not binary.
14h 25m 11.79s +51° 51' 02.7" P.A. 183.00 sep 70.2 mag 4.10,11.46 Sp F7V+M2.5V dist. 14.53 pc (47.4 l.y.)
STFA 26 AB: 152; 125x: Asellus secondus. Lovely light yellow, wide, 3 Dm. Alse seen with 60mm. 6% PRO, 1,144 AU WS, 1.8+0.8 Msol, it's slightly possible to be binary, an orbit should be tried.
14h 16m 10.07s +51° 22' 01.3" P.A. 33.00 sep 39.0 mag 4.76,7.39 Sp A7IV+K0V dist. 29.07 pc (94.83 l.y.)
ES 2648 AB: 152; 125x: Faint B, very wide. -13% PRO, it is not binary.
15h 12m 43.76s +48° 34' 50.4" P.A. 339.00 sep 25.9 mag 7.28,11.25 Sp K0 dist. 154.32 pc (503.39 l.y.)
STT 291 AB: 152; 125x: 3 Dm wide pair. 18% PRO, 5,604 AU WS, 2.8+1.4 Msol, but RVD 2.6 > EV 1.1, it is not binary.
15h 00m 38.72s +47° 16' 38.8" P.A. 156.00 sep 35.7 mag 6.33,9.62 Sp B9pSiSrCr dist. 169.78 pc (553.82 l.y.)
STT 296 AB: 152; 200x: 1 Dm, close split. -91% PRO! It is not binary, despite the SOC grade 4 orbit.
15h 26m 26.56s +44° 00' 13.2" P.A. 273.00 sep 2.3 mag 7.83,9.09 Sp G5 dist. 87.95 pc (286.89 l.y.)
KU 108 AB: 152; 125x: Pale orange A and wide 1 Dm B. -33% PRO, it is not binary.
15h 27m 40.35s +42° 52' 52.9" P.A. 319.00 sep 40.7 mag 7.55,9.74 Sp G5 dist. 32.13 pc (104.81 l.y.)
STT 301 AB: 152; 200x: Extremely faint closely separated, needed averted vision. 45% PRO, 897 AU WS, 2.8+1.2 Msol, it is probably binary and needs an orbit.
15h 46m 13.64s +42° 28' 06.3" P.A. 27.00 sep 4.0 mag 7.50,10.38 Sp K0 dist. 216.45 pc (706.06 l.y.)
STF1858 AB: 152; 200x: Pale yellow, fairly closely split, 1 Dm. -27% PRO, it is not binary despite the SOC grade 5 orbit.
14h 33m 36.45s +35° 35' 08.0" P.A. 38.00 sep 3.1 mag 8.13,8.98 Sp G5 dist. 36.79 pc (120.01 l.y.)
STT 289 AB: 152; 450x: Bright white A and very much fainter and closer B, seen with averted vision and high power only. Only 1% PRO (and 0.6% error), 503 AU WS, 2.4+0.8 Msol, there is a chance it's binary and more time is needed to track it.
14h 55m 58.63s +32° 18' 00.3" P.A. 112.00 sep 5.1 mag 6.20,11.10 Sp A2V dist. 95.79 pc (312.47 l.y.)
STF1854 AB: 152; 200x: Bright white A, B seen with foveal coaxing and then can hold direct. Noticed faint wide C. -32% PRO, it is not binary.
14h 29m 49.66s +31° 47' 28.2" P.A. 255.00 sep 26.7 mag 6.05,10.62 Sp A0Vs dist. 110.13 pc (359.24 l.y.)
STF1812 AB-C: 152; 125x: 2 Dm wide, light orange A. Did not try for the close AB pair STT 277. 48% PRO, 2,498 AU WS, 2.1+1.4 Msol, but RVD 1.8 is slightly greater than EV 1.6 -- more time is needed to determine if binary, an orbit should be tried.
14h 12m 26.68s +28° 43' 02.3" P.A. 108.00 sep 14.1 mag 7.88,9.45 Sp F2V dist. 131.75 pc (429.77 l.y.)
STF1850 AB: 152; 125x: Clean near equal stars, wide, seen with 60mm too. 18% PRO, 6,819 AU WS, 3.1+2.7 Msol, it is possibly binary and an orbit should be tried.
14h 28m 33.29s +28° 17' 25.9" P.A. 261.00 sep 25.5 mag 7.11,7.56 Sp A1V+A1V dist. 483.09 pc (1575.84 l.y.)
BU 946 AB: 152; 200x: ! Wow! Very extremely fine B appears just beyond bright A's diffraction ring and hardens to point with seeing. A jet plane flew across the FOV during the observation. -28% PRO! It is not binary.
15h 47m 37.92s +55° 22' 35.9" P.A. 129.00 sep 2.3 mag 5.91,9.53 Sp A3m dist. 73.8 pc (240.74 l.y.)
STTA143 AB: 152; 125x: White stars, 2 Dm, wide, seen in 60mm too. No Gaia parallax data for the primary.
16h 04m 48.95s +70° 15' 42.0" P.A. 83.00 sep 46.9 mag 6.87,8.78 Sp A0 dist. 129.7 pc (423.08 l.y.)
STT 307 AB: 152; 125x: Wide 3 Dm B seen with foveal coaxing and can then hold direct. -86% PRO, it is not binary.
16h 10m 31.74s +47° 48' 25.1" P.A. 201.00 sep 17.6 mag 7.67,10.71 Sp K0 dist. 242.13 pc (789.83 l.y.)
SHJ 233 AB: 152; 125x: Wide 1 Dm, seen in 60mm too. -40% PRO, it is not binary.
16h 31m 30.62s +08° 17' 38.8" P.A. 71.00 sep 59.2 mag 7.07,8.28 Sp G5 dist. 77.82 pc (253.85 l.y.)
KU 1 AB: 152; 250x: ! Wow! Bright pale yellow A, much fainter B hardens to a point with seeing, just out of A's diffraction ring. 30% PRO, 89 AU WS, 1.5+0.6 Msol, it is likely binary and needs an orbit.
16h 43m 06.14s +77° 30' 48.5" P.A. 175.00 sep 2.4 mag 6.06,10.20 Sp F5IV dist. 36.1 pc (117.76 l.y.)
BU 962 AB: 152; 380-570x: Touching disks forming a slightly notched elongation with noticeable delta magnitude. No Gaia data for the secondary. SOC grade 2 orbit, 76.1-year period, it will widen to apastron in 2030 -- keep an eye on it!
17h 34m 59.58s +61° 52' 28.4" P.A. 301.00 sep 0.6 mag 5.28,8.54 Sp F9V+K3V dist. 14.19 pc (46.29 l.y.)
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