Monday, August 22, 2022

21 august 2022

It was windy all afternoon so I did not expect seeing to be very good.  I let the 6-inch cool off and began observing some pairs in Cepheus, far north.  Too far north, actually, as sometimes I'd be pointed at the wall of the house.  After Saturn cleared the meridian tree I had a look, but it was a bit soft.  The rings are greatly foreshortened.  I concluded with some more pairs in Capricorn.

STF  11 AB: 152; 125x: Light orange-red A and much fainter B, well split, need averted vision to brighten B but I can hold it direct.  WDS says it's physical, but there is no parallax data for the secondary.
00h 15m 11.16s +78° 01' 02.3" P.A. 194.00 sep 8.0 mag 8.48,10.14 Sp K0 dist. 294.12 pc (959.42 l.y.)

STF  13 AB: 152; 250x: Nice near equal stars, hairline split with seeing, white.  WDS grade 4 orbit, 1245.6-year period.  There is 69% overlap of the parallax ranges, only 173 AU weighted separation, 2.6+2.5 Msol, so it is likely binary.  
00h 16m 14.02s +76° 57' 03.0" P.A. 47.60 sep 1.0 mag 7.03,7.12 Sp B8Vnn dist. 192.31 pc (627.32 l.y.)
STF  34 AB: 152; 125x: Slightly unequal, well split white stars.  WDS says proper motion indicates physical.  There is 60% parallax range overlap, only 467 AU weighted separation, 1.0+1.0 Msol, and the radial velocity delta 0.1 is less than the escape velocity 2.7, so it is likely binary.
00h 32m 43.59s +78° 06' 41.5" P.A. 339.00 sep 5.8 mag 9.61,9.71 Sp G5 dist. 80.32 pc (262 l.y.)

STF  69 AB: 152;125x: Super wide faint pair.  WDS says not physical, and there is -98% overlap of the parallax ranges, it is not binary.
00h 59m 27.97s +83° 40' 59.4" P.A. 33.00 sep 28.8 mag 9.54,10.59 Sp A2

STF  89 AB: 152; 125x: Faint wide pair, nearly 1 Dm.  WDS says it is not physical, and there is -97% overlap of the parallax ranges, it is not binary.
01h 10m 40.60s +80° 20' 37.4" P.A. 320.00 sep 16.9 mag 9.72,10.02 Sp K

STF 118 AB: 152; 125x: Faint wide pair.  WDS says proper motion indicates not physical, and there is -80% overlap of the parallax ranges, it is not binary.
01h 35m 09.47s +83° 21' 13.1" P.A. 94.00 sep 15.5 mag 9.17,10.22 Sp F5

STF 127 AB: 152; 125x: Wide, > 1 Dm.  WDS uncertain, but there is -79% parallax range overlap, it is not binary.
01h 36m 26.34s +79° 09' 17.2" P.A. 190.00 sep 23.4 mag 8.75,9.96 Sp A0 dist. 321.54 pc (1048.86 l.y.)

STF 223 AB: 152; 250x: Very subtly notched elongation, with seeing, near equal light orange stars.  WDS uncertain, and there is no data on the companion.
02h 21m 06.84s +80° 43' 36.0" P.A. 48.00 sep 0.8 mag 7.89,9.81 Sp B9.5V dist. 724.64 pc (2363.78 l.y.)

STF 319 AB: 152; 125x: 2 Dm, wide, averted vision only for B.  WDS says this is not physical, and there is -91% parallax range overlap, it is not binary.
03h 20m 44.15s +84° 58' 39.3" P.A. 302.00 sep 17.8 mag 8.33,10.87 Sp G0

STF 327 AB: 152; 125x: 2 Dm, wide, need averted vision to see B.  WDS uncertain, and there is -92% parallax range overlap, it is not binary.
03h 11m 42.67s +81° 28' 14.5" P.A. 289.00 sep 20.3 mag 5.95,10.70 Sp A7III-IV dist. 62.19 pc (202.86 l.y.)

STF2683 AB: 152; 125x: Very wide, 1 Dm.  WDS says proper motion indicates physical, and there is 95% parallax range overlap, 4,323 AU weighted separation, 1.9+1.8 Msol, and the radial velocity delta 0.4 is less than the escape velocity 1.2, so it is likely binary but pretty far apart.
20h 28m 23.50s -13° 09' 23.0" P.A. 67.00 sep 22.8 mag 8.52,8.88 Sp F3V+F6V

STF2699 AB: 152; 125x: Wide, 2 Dm.  WDS says it's physical, but there's -24% parallax range overlap, so in spit of the low 874 AU weighted separation, 1.5+1.2 Msol, and the radial velocity delta 0.9 < escape velocity 2.3, it is likely not binary.
20h 36m 55.06s -12° 44' 13.4" P.A. 197.00 sep 9.2 mag 8.03,9.22 Sp F2IV/V dist. 90.99 pc (296.81 l.y.)

STF2805 AB: 152; 125x: White and quite faint B, can see it direct but averted vision brightens it.  WDS says it's not physical, and there is -94% parallax range overlap, it is not binary.
21h 35m 34.17s -11° 47' 22.3" P.A. 319.00 sep 37.4 mag 8.64,11.01 Sp F3V dist. 183.49 pc (598.54 l.y.)

STF2821 AB: 152; 125x: Very faint B seen with averted vision only, well separated.  WDS says it is not physical, and there is -83% parallax range overlap, it is not binary.
21h 45m 18.39s -13° 40' 33.4" P.A. 223.00 sep 27.3 mag 8.74,11.55 Sp K3III dist. 2325.58 pc (7586.04 l.y.)

STF2826 AC: 152; 150x: Close split, unequal pair, nearly 1 Dm, about 3" separated.  WDS says it's physical, and there is 72% parallax range overlap, 1,021 AU weighted separation, 2.0+1.9 Msol, so it is possibly binary.  HWE 58 AB 8.70/10.01 0.6" not detected.
21h 47m 26.81s -13° 07' 17.9" P.A. 81.00 sep 4.0 mag 8.70,9.06 Sp A5II/III dist. 257.73 pc (840.72 l.y.)

STF2839 AB: 152; 125x: Need averted vision to see B, white A and 3 Dm well split B.  Not in WDS.

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