Saturday, November 13, 2021

11 november 2021

Predicted clear with good seeing but middling transparency, and it was with a lot of dew.  I was a bit underwhelmed by the session, and caught myself going after easy pairs I would just as well (or better) go after with my 6-inch.  Still good to be out and using the scope.  At around 11pm the electrical cut out intermittently and the Argo lost it's pointing, and rather than redo a two star alignment, decided to call it a night.  

STF3055 AB: 508; 205x: Easy, wide, 2 delta mag, light yellow A [spectral class F0III yellow].  WDS uncertain, but there is 76% parallax range overlap, 1,076 AU weighted separation, and 2.51/1.19 Msol, so likely gravitational.
00h 04m 00.24s +12° 08' 45.0" P.A. 359.00 sep 5.7 mag 7.28,10.34 Sp F0III dist. 176.37 pc (575.32 l.y.)

STF3061 AB: 508; 205x: Easy wide pair, near equal, very light yellow-white [spectral class F5V+F5V (yellow-white/yellow-white].  WDS calls it physical, but there is no overlap of parallax ranges (-68%), so they are not.
00h 05m 44.45s +17° 50' 25.0" P.A. 149.00 sep 7.8 mag 8.40,8.51 Sp F5V+F5V dist. 128.04 pc (417.67 l.y.)

STF3058 AB: 508; 205x: Easy, wide, 2 delta mag, yellow.  [Spectral class F3V+F6V (yellow-white/yellow-white)].  WDS says physical, but there is barely overlap in their parallax ranges (4%), 1,899 AU weighted separation, 2.01/1.39 Msol, and the radial velocity delta exceeds the escape velocity, so these are not gravitational.  
00h 05m 09.24s +30° 19' 44.5" P.A. 51.00 sep 12.6 mag 7.81,9.21 Sp F3V+F6V dist. 253.16 pc (825.81 l.y.)

A 1250 AB: 508; 333x: Did not resolve at 205x, needed 333x to split, 2 delta mag.  WDS uncertain, and unfortunately there is no Gaia data on the secondary.
00h 04m 51.96s +30° 05' 09.4" P.A. 41.00 sep 0.9 mag 8.22,9.65 Sp F7V dist. 113.64 pc (370.69 l.y.)

HO 208 AB: 508; 333x: Light orange stars, split with 333x.  WDS calls it physical and even provides an orbit with a 649-year period, but they do not share parallax ranges (-54%), in spite of a very close 154 AU weighted separation, 1.63/1.15 Msol, the radial velocity delta (15.51) greatly exceeds the escape velocity (6.18) -- so these are not gravitational.  
00h 01m 29.19s +30° 44' 08.7" P.A. 185.30 sep 1.0 mag 8.20,9.81 Sp G0IV dist. 117.79 pc (384.23 l.y.)

STF3060 AB: 508; 205x: Light orange stars, near equal, well split.  [Spectral class F8 (yellow-white)].  WDS physical with a 3804-year period.  There is 79% overlap of their parallax ranges, a very close 129 AU weighted separation, 0.75/0.71 Msol, and the radial velocity delta (0.69) is far less than the escape velocity (4.48). so these are gravitational.
00h 05m 55.56s +18° 04' 34.4" P.A. 135.60 sep 3.4 mag 9.32,9.65 Sp F8 dist. 37.15 pc (121.18 l.y.)
HU 401 A twenty thirettn, with seeing, steady split with eight, white near equal.  WDS uncertain, and the parallax ranges don't overlap (-19%) so these are not gravitational.  
00h 06m 09.44s +23° 46' 25.1" P.A. 36.00 sep 0.9 mag 10.57,10.80 Sp G0

KU 3 AB: 508; 333x:  Nice equal white pair, good split.  WDS uncertain, but there is 15% of parallax range overlap, 396 AU weighted separation, 1.85/1.81 Msol, so may be gravitational.  
00h 07m 28.21s +20° 29' 35.7" P.A. 76.00 sep 0.9 mag 10.32,10.40 Sp A2

COU 246 AB: 508; 333x: Good split, unequal around 1 delta mag, light yellow [spectral type G5 (yellow)].  WDS uncertain, yet there is 38% parallax range overlap, 325 AU weighted separation, 1.38/1.16 Msol, so may be gravitaional.
00h 08m 23.08s +18° 43' 09.2" P.A. 252.00 sep 1.6 mag 10.10,10.74 Sp G5

BU 1027 AB: 508; 205x: Easy light orange A and deeper orange B, 3 delta mag, <2".  WDS says physical, but their parallax ranges do not overlap (-84%), so they are not gravitational. 
00h 14m 56.33s +21° 32' 31.6" P.A. 192.00 sep 1.7 mag 7.28,10.54 Sp K2 dist. 238.1 pc (776.68 l.y.)

STF 12 AB: 508; 205x: Very bright A, white, wide, 1 delta mag.  [Spectral type A9V+F3V (white/yellow-white)].  WDS says physical, but the parallax ranges do not overlap (-17%), so they are not gravitational.
00h 14m 58.84s +08° 49' 15.5" P.A. 148.00 sep 11.2 mag 6.06,7.51 Sp A9V+F3V dist. 77.76 pc (253.65 l.y.)

BU 1342 AB: 508; 205x: Bright white A and faint B seen immediately very well separated.  WDS uncertain, and the parallax ranges do not overlap (-13%).
00h 16m 05.39s +08° 06' 56.2" P.A. 146.00 sep 6.1 mag 7.63,12.50 Sp A5 dist. 113.25 pc (369.42 l.y.)

STF 20 AB: 508; 205x: Easy, wide light yellow A and blue B, 1 delta.  WDS says physical, but the parallax ranges do not quite overlap (-2%, with 3% error), these may not be gravitational.  
00h 17m 22.36s +16° 30' 37.5" P.A. 233.00 sep 11.9 mag 8.87,9.67 Sp F9V dist. 125 pc (407.75 l.y.)

A 1803 AB-C: 508; 205x: Wide pair, easy, one delta mag.  WDS uncertain, however there is no overlap of parallax ranges (-94%).
00h 17m 24.50s +08° 52' 34.8" P.A. 234.00 sep 3.9 mag 7.13,7.66 Sp F2V dist. 15.19 pc (49.55 l.y.)

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