3 june 2021

Once again, the seeing was optimistically forecast, but in reality was poor, even with the 7-inch mask. I changed my observing list to easier, wider pairs and made many observations. But most were wide, likely not physical, and uninteresting, and my descriptions reflected that.  I suppose early observers could be forgiven thinking some of these might be binary, and even 100 years ago with some proper motion data to think so.  But now we have more information and these are just not interesting to observe as binaries, and there's no point to continue to study them.  The WDS needs a major clean-up to establish which are true binaries and dump the rest.  

Summer twilight is in full effect, it seemed it never got dark even when I closed up at 11pm.  Observations not in time order: 

STF1773 AB: 178; 205x: Wide near equal, part of a triple system forming a triangle of near equal stars which are not physical

13h 41m 38.19s +07° 36' 21.3" P.A. 209.00 sep 30.6 mag 9.95,10.00 Sp F7V

STF1791 AB: 178; 205x: Faint, wide, 1 delta.  Not physical
13h 56m 49.22s +14° 25' 58.6" P.A. 159.00 sep 21.0 mag 9.39,10.73 Sp F7V+G1IV

STF1873 AB: 178; 205x: Pretty light orange and blue stars, wide, 1 delta.  Physical in WDS but my calculator shows there is no overlap in the stars' parallax
14h 44m 48.13s +07° 42' 04.0" P.A. 94.00 sep 6.9 mag 7.96,8.35 Sp G5III dist. 232.56 pc (758.61 l.y.)

ENG 51 AB: 178; 205x: Super wide faint companion, not physical.

14h 19m 16.28s +13° 00' 15.5" P.A. 219.00 sep 164.0 mag 5.44,10.84 Sp F5IV dist. 26.1 pc (85.14 l.y.)

STF1782 AB: 178; 205x: Wide 1 delta.  Physical in WDS and my calculator agrees.
13h 45m 06.87s +18° 22' 04.3" P.A. 185.00 sep 30.4 mag 7.98,9.81 Sp F5

S 656 AB: 178; 205x: Wide, white, half delta.  WDS says it's physical but I calculate no parallax overlap and the two are too far apart to be gravitationally bound.
13h 50m 23.51s +21° 16' 35.8" P.A. 209.00 sep 86.2 mag 6.93,7.37 Sp G0 dist. 105.71 pc (344.83 l.y.)

SHJ 169 AB: 178; 205x: Muphrid.  Very wide faint B to bright white A.  Not physical
13h 54m 41.07s +18° 23' 51.8" P.A. 85.00 sep 114.0 mag 2.72,9.99 Sp G0IV dist. 11.4 pc (37.19 l.y.)

BU 1442 AB: 178; 205x: 5 stars in the system, but only 3 are bright enough for me to see with 7-inch, they form an arc (like a jumping dolphin) of near equal stars. WDS says AB are physical and my calculator agrees, which is a surprise given the very wide separation -- they are relatively close stars so appear wide.
14h 25m 43.56s +23° 36' 59.9" P.A. 74.00 sep 45.2 mag 9.87,10.21 Sp M1+M1.5 dist. 16.36 pc (53.37 l.y.)

BGH 50 AB: 178; 205x: Very wide 1 delta mag.  WDS claims physical.  My calculator shows there is no parallax overlap by fractions of parsecs -- with should be enough to exclude them from being physical, but it's close.  This should be listed as uncertain.
14h 04m 45.95s +25° 49' 03.9" P.A. 32.00 sep 97.0 mag 7.00,8.90 Sp F5+K0 dist. 44.01 pc (143.56 l.y.)

STF1850 AB: 178; 205x: Near equal white wide.  WDS claims physical, and their parallax do overlap, however they are separated by 7168 AU, too far than the known 5000 AU limit of known orbital pairs.
14h 28m 33.29s +28° 17' 25.9" P.A. 263.00 sep 25.2 mag 7.11,7.56 Sp A1V+A1V dist. 349.65 pc (1140.56 l.y.)

STF1653 AB: 178; 205x: Wide one delta white pair.  WDS claims physical but there is no parallax overlap.
12h 33m 22.34s +32° 02' 23.4" P.A. 343.00 sep 8.0 mag 9.66,9.67 Sp F3V+F3V dist. 121.8 pc (397.31 l.y.)

STF1646 AB: 178; 205x: Faint, B seen averted vision only, fairly close.  WDS claims physical but there is no parallax overlap, with a 2 parsec gap -- too far to be gravitationally bound.
12h 28m 09.12s +36° 41' 02.1" P.A. 260.00 sep 5.6 mag 10.30,12.90 Sp F5

STF1727 AB: 178; 205x: B is faint but not too hard to pick out, well separated.  Physical, and I agree
13h 09m 52.02s +31° 22' 00.3" P.A. 333.00 sep 7.5 mag 9.81,10.99 Sp G dist. 138.5 pc (451.79 l.y.)

STF1672 AB: 178; 205x: B is quite faint but can see direct, well separated white.  Not physical
12h 42m 39.65s +33° 48' 51.3" P.A. 312.00 sep 4.3 mag 8.92,10.22 Sp F5V dist. 177.62 pc (579.4 l.y.)

STF1739 AB: 178; 205x: Very faint but surprisingly can see B direct, well separated one delta.  WDS lists as uncertain but there is no parallax overlap by a wide margin, so it can be listed as not physical.
13h 22m 33.24s +30° 30' 55.8" P.A. 126.00 sep 14.9 mag 11.05,11.80" P.A. 126.00 sep 14.9 mag 11.05,11.80

STF1854 AB: 178; 205x: White and wide faint B, 3 delta.  WDS claims physical but there is no overlap in their parallax range, with a gap of a fraction of a parsec, still enough to keep them from being gravitationally bound.
14h 29m 49.66s +31° 47' 28.2" P.A. 256.00 sep 26.1 mag 6.05,10.62 Sp A0Vs dist. 110.13 pc (359.24 l.y.)

STT 289 AB: 178; 205x: B seen averted vision only, well separated.  WDS is uncertain but there is a good parallax overlap and they are separated by 503 AU, so it's very likely these are gravitationally bound.

14h 55m 58.63s +32° 18' 00.3" P.A. 109.00 sep 4.8 mag 6.20,11.10 Sp A2V dist. 95.79 pc (312.47 l.y.)

 

STF1624 AB: 178; 205x: 3 delta white and bluish stars, well separated.  WDS uncertain, but no parallax overlap so not likely physical.
12h 16m 42.19s +39° 35' 34.5" P.A. 153.00 sep 5.9 mag 7.28,10.17 Sp A2.5V dist. 108.81 pc (354.94 l.y.)

STF1632 AB: 178; 205x: Light yellow and 3 delta B, wide.  WDS lists physical and I agree.
12h 20m 13.50s +37° 54' 07.7" P.A. 192.00 sep 10.1 mag 6.83,9.98 Sp K0III+F9V dist. 165.29 pc (539.18 l.y.)

STF1638 AB: 178; 205x: Faint pair, considerable delta, wide.  Not physical.
12h 24m 13.24s +43° 03' 37.1" P.A. 282.00 sep 8.3 mag 10.29,10.70 Sp F5

STF1645 AB: 178; 205x: Slight delta, wide, pretty light yellow-white stars.  WDS lists as physical, and I agree
12h 28m 04.45s +44° 47' 39.5" P.A. 156.00 sep 9.8 mag 7.49,8.08 Sp F9V+KV dist. 43.61 pc (142.26 l.y.)

STF1642 AB: 178; 205x: Closely separated 1 delta light yellow stars.  WDS uncertain, and I find there is no overlap in the parallax ranges, with 1 parsec separating the ranges, so these are not physical.
12h 25m 45.00s +44° 44' 04.4" P.A. 180.00 sep 2.5 mag 8.80,9.40 Sp F5 dist. 244.5 pc (797.56 l.y.)

STF1688 AB: 178; 205x: White B and B is very faint, wide, can just hold it direct vision.  Not physical.

12h 53m 35.26s +37° 58' 20.9" P.A. 344.00 sep 14.4 mag 9.24,11.06 Sp G0 dist. 318.47 pc (1038.85 l.y.)

STT 257 AB: 178; 205x: Easy wide one delta.  WDS claims physical but there is no parallax overlap, so these are not gravitationally bound.
12h 56m 44.77s +45° 36' 45.1" P.A. 353.00 sep 12.9 mag 8.53,9.56 Sp F2Vp+F6V dist. 2702.7 pc (8816.21 l.y.)

STF1747 AB: 178; 205x: Wide one delta.  WDS claims physical but there is no parallax overlap
13h 27m 45.73s +47° 45' 32.2" P.A. 345.00 sep 14.9 mag 9.31,10.22 Sp K0 dist. 222.72 pc (726.51 l.y.)

STF1679 AB: 178; 205x: White 1 delta, wide.  WDS is uncertain but there is good parallax overlap and 1183 AU separation, so likely physical.
12h 46m 00.83s +49° 49' 23.0" P.A. 208.00 sep 5.9 mag 9.62,10.01 Sp F6IV dist. 113.64 pc (370.69 l.y.)

STF1758 AB: 178; 205x: 1 delta, well separated.  WDS uncertain but there is definitely no parallax overlap, so these are not physical.
13h 32m 51.51s +49° 08' 24.3" P.A. 290.00 sep 3.4 mag 8.70,8.95 Sp G0 dist. 77.04 pc (251.3 l.y.)