STF 2666 AB: 152; 175x: Light yellow A and orange B, 2 delta, nice. WDS uncertain. 32% parallax range overlap (but with 13% error), 2,749 AU weighted separation, pretty high 7.63/4.80 solar mass.
20h 18m 06.99s +40° 43' 55.6" P.A. 245.00 sep 2.8 mag 5.96,8.24 Sp O9IV+B1.5 dist. 595.24 pc (1941.67 l.y.)
STT 403 AB: 152; 175x: Near equal hairline split, white, 2 delta mag. Fainter C (STF 2657 AC) well split nearby. WDS uncertain but there is 26% parallax range overlap, 372 AU weighted separation, and high 3.54/3.29 solar mass, so very likely gravitational.
20h 14m 21.53s +42° 06' 15.6" P.A. 171.00 sep 0.9 mag 7.31,7.64 Sp B9IV-V dist. 581.4 pc (1896.53 l.y.)
STT 400 AB: 152; 245x: Tough, notched elongation, near equal white stars. Physical with 85-year period, it is at apastron now will close entirely in the next 30 years.
20h 10m 13.32s +43° 56' 44.2" P.A. 325.40 sep 0.7 mag 7.60,9.83 Sp G3V dist. 51.33 pc (167.44 l.y.)
STF 2607 AB-C: 152; 175x: Pretty light yellow-white A and reddish B, 2 delta mag, around 4". Nice. AB is STT 392 6.60/8.40 0.1", not seen (and only 0.2" at discovery in 1843; physical with a 270-year period). AB-C is uncertain in WDS, but I find the stars do not share parallax ranges, -10%
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.)
STF 2609 AB: 152; 175x: Beautiful ice-blue A and yellow B, 1 delta mag, about 3" separation. Spectral class B5IV (blue-white). 3% parallax range overlap, 660 AU weighted separation, 3.81/3.01 solar mass, so maybe gravitational.
19h 58m 34.37s +38° 06' 20.8" P.A. 22.00 sep 1.9 mag 6.69,7.64 Sp B5IV dist. 440.53 pc (1437.01 l.y.)
STT 394 AB: 152; 245x: White star among several fainter stars, none which strike one as being the pair. WDS is calling it physical, and they might be right: 28% parallax range overlap, 2,011 AU weighted separation, 2.77/1.22 solar mass.
20h 00m 11.43s +36° 24' 50.8" P.A. 294.00 sep 11.0 mag 7.14,10.27 Sp K1III dist. 152.44 pc (497.26 l.y.)
I took a pause at this moment to slew to Jupiter and catch the end of an Io shadow transit. The small black shadow had about 1/5th of the disk to complete, and it only took around 15 minutes for it to get to the limb. The speed of the transit, and the fact the moon casting the shadow was not very far from Jupiter, were indications it was Io. The other three were all to one side so it was easy to tell size difference between them.
STF 2 AB: 152; 175x: Light orange stars, very tight, hairline split, near equal mag. Physical with a 540-year period it is to slowly widen. 22% parallax overlap, only 82 AU weighted separation, 2.16/2.10 solar mass.
00h 09m 20.18s +79° 42' 52.4" P.A. 14.30 sep 0.9 mag 6.68,6.89 Sp A4IV dist. 105.49 pc (344.11 l.y.)
00h 02m 46.53s +80° 16' 56.2" P.A. 24.00 sep 17.0 mag 7.74,9.47 Sp F2V dist. 148.81 pc (485.42 l.y.)
STT 481 AB: 152; 175x: Very faint, 2 delta mag, around 2" separation. WDS uncertain, 4% parallax range overlap, 576 AU weighted separation, 2.76/1.72 solar mass.
22h 43m 50.72s +78° 31' 05.7" P.A. 276.00 sep 2.3 mag 7.46,9.54 Sp A0II-III dist. 390.63 pc (1274.24 l.y.)
STF 2801 AB: 152; 245x: Nice! Light orange A and blue B, 1 delta mag, around 2" separation
21h 18m 31.05s +80° 21' 12.5" P.A. 272.00 sep 2.1 mag 7.87,8.62 Sp F6V dist. 82.24 pc (268.27 l.y.)
STF 2675 AB: 152; 175x: Light yellow bright A, 2 delta mag orange B, well separated. WDS physical, but they (just barely) don't share parallax range overlap, -3%.
20h 08m 53.32s +77° 42' 40.9" P.A. 120.00 sep 7.3 mag 4.39,8.34 Sp B9III dist. 96.53 pc (314.88 l.y.)
STF 2571 AB: 152; 175x: Wide, 1 delta mag white. WDS says physical, but they don't share parallax range overlap -6%.
19h 29m 30.03s +78° 15' 55.8" P.A. 19.00 sep 11.2 mag 7.69,8.27 Sp F0IV dist. 202.43 pc (660.33 l.y.)
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