16 july 2022

Observed with the six-inch, chasing after Struves.  A decent enough night, ok seeing with some marine in the sky as usual.  

STF1335 AB: 152; 125x: Faint, 2 Dm, wide.  WDS says not physical, and indeed there is -55% parallax overlap, it is not binary.
09h 28m 21.19s +77° 07' 05.9" P.A. 52.00 sep 24.5 mag 9.49,11.24 Sp K0

STF1362 AB near equal wide.  WDS grade 9 (indeterminate) orbit, only 7.9 years.  Remarkably, there is 15% parallax overlap, 339 AU weighted separation, 1.6+1.5 Msol, and the radial velocity delta 0.1 is less than the escape velocity 4.0 -- so it would be amazing if this is a true binary with such a short period, for certain it needs to be reobserved.
09h 37m 56.18s +73° 04' 49.5" P.A. 125.00 sep 4.9 mag 7.03,7.20 Sp F1V+F2V dist. 71.02 pc (231.67 l.y.)

STF2486 AB: 152; 125x: Lovely near equal white stars well split.  WDS grade 4 orbit, 3100 year period.  There is 84% parallax overlap, 189 AU weighted separation, 1.1+1.1 Msol, and the radial velocity delta 0.2 is less than the escape velocity 4.5, so it may well be binary.
19h 12m 05.03s +49° 51' 20.7" P.A. 203.40 sep 7.1 mag 6.54,6.67 Sp G2V+G3V dist. 24.45 pc (79.76 l.y.)

STF2496 AB: 152; 300x: Tough, with seeing, a tiny fleck outside bright white A' diffraction.  WDS uncertain, but there is -78% parallax range overlap, it is not binary.

19h 15m 19.18s +50° 04' 16.0" P.A. 81.00 sep 2.1 mag 6.46,10.00 Sp G8III dist. 134.59 pc (439.03 l.y.)

STF2506 AB: 152; 125x: Fine pair, wide, 1 Dm, yellow-white A.  WDS uncertain, but there is -60% parallax range overlap, it is not binary.
19h 21m 45.89s +14° 21' 50.2" P.A. 349.00 sep 17.7 mag 9.56,10.46 Sp F2

STF2507 AB: 152; 125x: 2 Dm, wide white stars.  WDS says proper motion indicates non-physical, but more damning there is -98% parallax range overlap, it is not binary.
19h 19m 43.44s +44° 22' 29.2" P.A. 158.00 sep 25.1 mag 8.72,10.88 Sp F8

STF2511 AB: 152; 125x: Light orange A, very faint B just emerges with direct vision, well separated.  WDS uncertain, but there is -95% parallax range overlap, it is not binary.
19h 20m 31.45s +50° 20' 24.5" P.A. 53.00 sep 7.2 mag 7.51,11.10 Sp K5 dist. 293.26 pc (956.61 l.y.)

STF2522 AB: 152; 125x: Very pretty 1 Dm, fairly close but nice split pair, in a rich field.  WDS says not physical, but there is 53% overlap of the parallax ranges, 1,465 AU weighted separation, 2.9+2.2 Msol, and the radial velocity delta 1.2 is less than the escape velocity 2.5, so it is possible this is binary.
19h 25m 48.01s +28° 45' 34.0" P.A. 338.00 sep 4.6 mag 7.74,8.79 Sp A0 dist. 348.43 pc (1136.58 l.y.)

STF2528 AB: 152; 125x: Well split, 2 Dm, in a rich field seems near a star clouster.  WDS says parallax indicates physical, and there is 61% parallax range overlap, 2,984 AU weighted separation, 1.9+1.3 Msol, and the radial velocity delta 1.5 is slightly more than the escape velocity -- so this might or might not be binary.
19h 26m 39.59s +32° 20' 44.6" P.A. 244.00 sep 14.7 mag 8.80,10.44 Sp F2 dist. 3448.28 pc (11248.29 l.y.)

STF2534 AB: 152; 125x: Near equal, brilliant white stars, well split.  WDS says physical, but there is no (-36%) parallax range overlap, it is not binary.
19h 27m 40.63s +36° 31' 44.4" P.A. 63.00 sep 7.0 mag 8.21,8.39 Sp B9III dist. 900.9 pc (2938.74 l.y.)

STF2538 CD: 152; 125x: Pretty near equal, fairly closely split, white, likely plus one wide pair similar mag (AC).  5 stars in the system, WDS says not physical, but they are probably wrong: there is 41% overlap of the parallax ranges, onlu 602 AU weighted separation, 1.3+1.2 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.7, so it is possibly binary.

19h 31m 22.19s +36° 42' 17.5" P.A. 50.00 sep 6.0 mag 8.92,9.24 Sp G0 dist. 94.7 pc (308.91 l.y.)

STF2542 AB: 152; 125x: Wide, 1 Dm stars.  WDS says parallax indicates physical, and there is 15% parallax range overlap, a pretty wide 4,069 AU weighted separation, 2.4+1.9 Msol, and the radial velocity delta 0.8 is less than the escape velocity 1.4, so it is likely binary. 

19h 31m 57.62s +52° 59' 06.8" P.A. 254.00 sep 11.6 mag 8.86,9.61 Sp A1:+A3: dist. 247.52 pc (807.41 l.y.)

STF2539 AC: 152; 125x: Well split, nearly 2 Dm.  WDS uncertain, but there is -89% overlap of the parallax ranges, it is not binary.
19h 32m 05.91s +28° 16' 00.3" P.A. 3.00 sep 5.4 mag 7.67,9.78 Sp A0 dist. 161.03 pc (525.28 l.y.)

STF2555 AB: 152; 200x: Very close pair, slight magnitude difference, needed higher magnification.  WDS uncertain, but there is no overlap, -16%, of the parallax ranges, it is not binary.
19h 36m 11.77s +53° 22' 28.5" P.A. 283.00 sep 1.8 mag 9.42,9.90 Sp F5

STF2557 AB: 152; 200x: Bright white star, the brightest in field, with 2 Dm B well separated, rich field.   WDS says proper motion indicates non-physical, and even more there is no parallax range overlap, -92%, so it is not binary.
19h 39m 35.20s +29° 44' 55.5" P.A. 103.00 sep 11.0 mag 7.49,10.23 Sp B8Vn dist. 315.46 pc (1029.03 l.y.)

STF2559 AB: 152; 125x: Brighter white A and faint, well split B, more than 1".  Not listed in WDS.

STF2576 FG: 152; 125x: Beatutiful close near equal pair, very rich filed.  WDS gives it a grade 2 orbit 232-year period, but there is no parallax range overlap -31%, in spite of the mere 58 AU weighted separation and 0.7+0.7 Msol.  It might not be binary after all.
19h 45m 33.53s +33° 36' 07.1" P.A. 154.50 sep 3.1 mag 8.47,8.58 Sp K3V dist. 21.12 pc (68.89 l.y.)

STF2578 AB: 152; 125x: Lovely bright 1 Dm pair.  WDS says proper motion indicates non-physical, and there is no parallax range overlap -4%, with 5,408 AU weighted seaparation, it like likely not physical.
19h 45m 39.65s +36° 05' 27.6" P.A. 125.00 sep 14.9 mag 6.37,7.04 Sp B9.5V dist. 300.3 pc (979.58 l.y.)

STF2579 AB; 152; 200: Nice, very bright A with tiny faint B closely split.  Appears as a bump at 125x, cleanly split at 200x. WDS gives a grade 4 orbit with a 657-year period, and we'll have to take their word for it as I can't find the secondary's data in Gaia.
19h 44m 58.44s +45° 07' 50.5" P.A. 214.40 sep 2.8 mag 2.89,6.27 Sp B9.5IV dist. 50.58 pc (164.99 l.y.)

STF2580 AB: 152; 125x: Bright yellow A star, very wide fainter B.  WDS gives a grade 5 orbit 7904-year period, and there is 22% parallax range overlap, 547 AU weighted separation, 1.4+0.7 Msol, but the radial velocity delta 2.9 is slightly more than the escape velocity 2.6, so it might not remain binary -- or we just need more refined data.
19h 46m 25.60s +33° 43' 39.3" P.A. 68.20 sep 26.1 mag 5.06,9.25 Sp F5V dist. 21.23 pc (69.25 l.y.)

STF2588 A-BC: 152; 125x: Near equal white stars, wide.  BC is A718, 8.2/8.7 0.1".  WDS says proper motion indicates physical, but there is no Gaia parallax data for the secondary.
19h 49m 00.90s +44° 22' 45.1" P.A. 159.00 sep 9.6 mag 7.74,8.12 Sp B8III dist. 854.7 pc (2788.03 l.y.)

STF2598 AB: 152; 125x: Light orange A star, B is faint and wide on edge of direct vision.  WDS says it is not physical, and there is -44% parallax range overlap, it is not binary.
19h 50m 07.53s +54° 39' 06.5" P.A. 150.00 sep 11.8 mag 8.17,10.58 Sp K5 dist. 317.46 pc (1035.55 l.y.)

STF2606 AB 152; 380x: Very instantaneous split when the elongated haze develops bright disks, still hazy at edges but distinct, like two yolks of eggs, very tough.  WDS gives a grade 4 orbit, 455-year period, 0.63" now.  Unfortunately there is no Gaia parallax data for either star.
19h 58m 32.66s +33° 16' 38.8" P.A. 147.70 sep 0.6 mag 7.74,8.43 Sp F5IV dist. 78.43 pc (255.84 l.y.)

STF2607 AB-C: 152; 125x: Very pretty white A and 2 Dm B.  WDS uncertain, and there is -10% parallax range overlap, it is not binary.

19h 57m 56.12s +42° 15' 38.9" P.A. 289.00 sep 3.0 mag 6.56,9.09 Sp A3V dist. 325.73 pc (1062.53 l.y.)