Thursday, June 16, 2022

14 june 2022

Clear night, fairly good seeing though it became worse after 10:30pm.  Observed Struves in Lyra with the 6-inch f/15 refractor.  I noticed Gaia DR3 is now published on VizieR, so that is what I will use going forward.  

STF2304 AB: 152; 150x: Very lovely faint pair, very light orange A and light blue B, about 6" separation, about 1 Dm.  WDS claims it's physical, and there is 5% parallax range overlap, 1,780 AU weighted separation, 2.6+1.9 Msol, and the radial velocity delta 1.7 is less than the escape velocity 2.1, so it very likely is binary.
18h 17m 06.98s +40° 15' 21.2" P.A. 69.00 sep 5.1 mag 8.75,9.75 Sp K0 dist. 275.48 pc (898.62 l.y.)

STF2327 AB: 152; 150x: Nice pair, wide, large magnitude difference, B needs averted vision, white.  WDS asserts it's physical, and there is 6% parallax range overlap, 10,164 AU weighted separation, 3.5+1.6 Msol, however the radial velocity delta 4.0 exceeds the escape velocity, so it is not likely binary.
18h 29m 10.63s +29° 55' 24.9" P.A. 314.00 sep 19.6 mag 8.49,12.20 Sp K0

STF2328 AB: 152; 200x: Close pair around 4", less than 1 Dm.  WDS says parallax indicates physical, but in reality there is no overlap of their parallax ranges, -78%, so it is not binary.
18h 29m 27.87s +29° 55' 27.2" P.A. 72.00 sep 3.7 mag 9.00,9.50 Sp A2

STF2333 AB: 152; 150x: Slightly unequal white stars widely separated.  WDS uncertain, and there is no overlap -12% of the parallax ranges, it is not likely binary.
18h 31m 06.94s +32° 14' 43.4" P.A. 333.00 sep 6.3 mag 7.82,8.57 Sp B9IV dist. 216.92 pc (707.59 l.y.)

STF2338 AB: 152; 150x: Fairly bright white A, and well separated very faint B.  WDS says not physical, but there is 21% overlap of the parallax ranges, 6,406 AU weighted separation, 2.4+2.3 Msol, is it is very likely to be binary.
18h 30m 54.75s +38° 39' 33.8" P.A. 301.00 sep 12.1 mag 9.30,11.20 Sp K2

STF2340 AB: 152; 150x: Widely separated 1 Dm faint stars.  WDS says not physical, and there is no overlap -97% of the parallax ranges, so it is not binary.
18h 33m 01.30s +31° 35' 43.0" P.A. 105.00 sep 25.1 mag 9.21,10.24 Sp F2 dist. 423.73 pc (1382.21 l.y.)

STF2349 AB: 152; 150x: Excellent pair.  Blazing white A and a very faint B, around 7" separation, around 5 Dm.  WDS uncertain, but there is 48% parallax range overlap, 1,188 AU weighted separation, 3.6+1.2 Msol, so it is likely binary.
18h 36m 37.34s +33° 28' 08.5" P.A. 204.00 sep 7.2 mag 5.39,9.40 Sp B8II-IIIp dist. 154.56 pc (504.17 l.y.)

STF2351 AB: 152; 150x: Near equal white stars, well separated around 5".  WDS uncertain, but there is no overlap -15% of the parallax ranges, is it not likely binary.
18h 36m 12.00s +41° 16' 41.2" P.A. 160.00 sep 5.0 mag 7.60,7.64 Sp A1V+A0V dist. 206.61 pc (673.96 l.y.)

STF2352 AB: 152; 150x: White A and nearly Dm B which can been seen with direct vision, but brightens with averted vision.
18h 36m 57.43s +34° 51' 59.0" P.A. 287.00 sep 15.9 mag 8.06,10.63 Sp K0

STF2354 AB: 152; 150x: Very close to Vega, in its glare.  Faint stars, A is seen well, B is on the edge of direct vision, better seen with averted vision, widely separated.  No results found in WDS. 

STF2356 AB 152; 150x: Faint pair, just barely split with seeing, about half a magnitude difference.  WDS uncertain, and there is no overlap -33% of the parallax ranges, so it is not binary.
18h 38m 22.51s +28° 41' 49.7" P.A. 63.00 sep 1.0 mag 8.79,9.23 Sp F0 dist. 598.8 pc (1953.29 l.y.)

STF2358 CD: 152: 150x: Very closely split, half delta mag, nice.  In a triangle of three similar magnitude stars.  WDS uncertain, but there is no overlap -12% of the parallax ranges, it is probably not binary.
18h 38m 35.04s +30° 43' 20.1" P.A. 224.00 sep 2.5 mag 9.81,10.19 Sp F8

STF2359 AB: 152; 150x: In the same FOV as STF2358, one of the triangle stars.  A 9th magnitude A star with a very wide, 3 Dm B star which appears with averted vision only. 
18h 38m 35.50s +30° 45' 37.2" P.A. 293.00 sep 24.5 mag 9.06,11.70 Sp A

STF2362 AB: 152; 150x: Lovely, well separated 1 Dm, white stars.  WDS is uncertain, but there is 27% overlap of the parallax ranges, only 428 AU weighted separation, 1.7+1.3 Msol, so it is likely it is binary.
18h 38m 25.70s +36° 03' 11.3" P.A. 187.00 sep 4.4 mag 7.53,8.72 Sp A5 dist. 105.26 pc (343.36 l.y.)

STF2371 AB: 152; 150x: Near equal white stars, faint, wide.  WDS uncertain, but there is 34% parallax range overlap, 6,674 AU weighted separation, 2.8+2.6 Msol, and the radial velocity delta 0.2 is less than the escape velocity 1.2, so it is most likely binary.
18h 42m 12.44s +27° 38' 32.3" P.A. 56.00 sep 10.0 mag 9.68,9.96 Sp A0

STF2372 AB: 152; 150x: Bright white and very wide 2 Dm B, in a rich field.  WDS says parallax indicates the components are non-physical, and there is 1% parallax range overlap but with a 52% error, and 11,995 AU weighted separation, probably not binary.
18h 42m 08.09s +34° 44' 46.7" P.A. 82.00 sep 25.0 mag 6.45,7.73 Sp B5V dist. 456.62 pc (1489.49 l.y.)

STF2374 AB: 152: 150x: Faint stars, very slight delta mag, wide.  WDS says not physical, and there is no overlap -96% of the parallax ranges, so indeed not binary.
18h 43m 27.56s +27° 42' 54.6" P.A. 40.00 sep 13.4 mag 9.64,10.43 Sp F2

STF2376 AB: 152; 150x: Wide near equal.  WDS says it is physical, and there is 85% overlap of the parallax ranges, 7,173 AU weighted separation, 2.4+2.0 Msol, and the radial velocity delta 0.7 is less than the escape velocity 1.0, so it is binary.
18h 43m 42.26s +30° 24' 16.9" P.A. 63.00 sep 22.3 mag 8.66,9.31 Sp A0 dist. 202.84 pc (661.66 l.y.)

STF2378 AB: 152; 150x: Very slight delta mag, wide.  WDS says parallax indicates physical, and there is 62% overlap of the parallax ranges, 3,228 AU weighted separation, 2.1+1.7 Msol, and the radial velocity delta 1.0 is less than the escape velocity 1.4, so it certainly is binary.
18h 43m 21.93s +35° 32' 55.3" P.A. 190.00 sep 11.5 mag 8.91,9.88 Sp A dist. 153.14 pc (499.54 l.y.)

STF2380 AB: 152: 150x: Light yellow A and 1 Dm wide B.  WDS says proper motion indicates physical, and the parallax ranges overlap 71%, 3,307 AU weighted separation, 2.2+1.4 Msol, however the radial velocity delta 2.2 exceeds the escape velocity 1.4, so it may not be binary.
18h 42m 55.42s +44° 55' 30.9" P.A. 8.00 sep 25.5 mag 7.28,8.70 Sp G8III dist. 138.12 pc (450.55 l.y.)

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