Saturday, October 1, 2022

29 september 2022 struves

Seeing was forecast to be merely good, and I was late to set-up anyway, so I took the covering off the 6-inch refractor for viewing.  It was quite a while using it for other than solar (notably seeing a mass ejection a few days ago).  As always, the star images were pristine, a joy to look at.  For any observing program with splits >0.8", this is the perfect telescope.  

STF2828 BC: 152; 125x: Very pretty 2+1 system.  The wide pair AB is 1 Dm, the close system is well split and near equal.  WDS says parallax indicates physical, and there is 29% parallax range overlap, only 443 AU weighted separation, 1.1+1.1 Msol, and the radial velocity delta 0.1 is less than the escape velocity 3.0, so it is likely binary and in need of an orbit.
21h 49m 32.02s +03° 23' 20.1" P.A. 40.00 sep 3.5 mag 9.96,9.99

STF2830 AB: 152; 150x: A is fairly bright, B is seen with averted visiononly, wide.  WDS uncertain, but there is no parallax range overlap, -88%, it is not binary.
21h 51m 10.68s +03° 06' 23.9" P.A. 237.00 sep 27.2 mag 8.88,11.86 Sp A5 dist. 201.21 pc (656.35 l.y.)

STF2831 AB: 152; 125x: White A and very faint B, averted vision only, wide.  WDS says physical, and there is 20% parallax range overlap, 904 AU weighted separation, 1.1+0.6 Msol, but the radial velocity delta 2.2 is greater than the escape velocity 1.8, so it is likely not binary.
21h 51m 18.34s +08° 20' 49.8" P.A. 355.00 sep 14.5 mag 8.61,11.52 Sp G5 dist. 49.73 pc (162.22 l.y.)

STF2833 AB: 152; 125x: White A and 2 Dm B, well split, can see faint B direct.  WDS says it's physical, and there is 61% overlap of the parallax ranges, 1,035 AU weighted separation, 1.7+1.0 Msol, and the radial velocity delta 2.2 is the same as the escape velocity, so it may well be binary.
21h 51m 56.56s +09° 04' 46.0" P.A. 337.00 sep 8.4 mag 7.84,10.20 Sp A5 dist. 118.34 pc (386.03 l.y.)

STF2834 AB: 152; 125x: White A and close, light orange, 3 Dm B.  WDS says physical, and there is 11% parallax range overlap, only 374 AU weighted separation, 1.9+0.9 Msol, and the radial velocity delta 3.0 is less than the escape velocity 3.6, so it is likely binary and needs an orbit.
21h 51m 40.18s +19° 18' 25.0" P.A. 298.00 sep 4.3 mag 6.93,9.89 Sp F5IV dist. 91.91 pc (299.81 l.y.)

STF2841 A-BC: 152; 125x: Very pretty orange A and blue B, wide, 1 Dm.  WDS says parallax indicates not physical, and there is no parallax range overlap, -77%, they are correct.
21h 54m 17.44s +19° 43' 05.3" P.A. 110.00 sep 22.4 mag 6.45,7.99 Sp K0III+F7V dist. 102.99 pc (335.95 l.y.)

STF2848 AB: 152; 125x: Near equal light yellow-orange, well split, pretty.  WDS says parallax indicates components are physical, however there is -11% parallax range overlap with DR3, so these likley are not binary.
21h 58m 01.45s +05° 56' 25.3" P.A. 56.00 sep 10.9 mag 7.21,7.73 Sp Am+F2V dist. 625 pc (2038.75 l.y.)

STF2849 AB: 152; 250x: Very fine split, B is faint and appears as a hard brightening outside A's first diffraction.  WDS uncertain, but there is -26% parallax range overlap, they likely are not binary.
21h 57m 43.20s +20° 14' 29.9" P.A. 243.00 sep 1.7 mag 8.69,10.37 Sp G5 dist. 123 pc (401.23 l.y.)

STF2850 AB: 152; 250x: OU Peg.  Reddish A, can just glimpse faint B in its diffraction as a weak brightening.  WDS uncertain, but there is 31% overlap of the parallax ranges, 1,226 AU weighted separation, 6.7+1.8 Msol, so it is likely binary.  OU Peg has a very wide magnitude range of 6.66, from around 4 to around 11 -- I caught it at around 7th mag.
21h 59m 49.60s +23° 56' 27.4" P.A. 264.00 sep 2.8 mag 7.00,11.00 Sp M5 dist. 621.12 pc (2026.09 l.y.)

STF2854 AB: 152; 125x: Nice!  Very fine split at low power, wider with more power, slightly unequal white pair.  WDS uncertain, but there is 45% overlap of the parallax ranges, only 130 AU weighted separation, 1.4+1.4 Msol, so it is likely binary.
22h 04m 22.52s +13° 38' 53.4" P.A. 84.00 sep 1.6 mag 7.77,7.89 Sp F6V dist. 72.1 pc (235.19 l.y.)

STF2856 AB: 152; 250x: Nice tight snowman with 125x, split with 250x, unequal pair around 1 Dm, off-white color stars.  WDS uncertain, and there is no parallax data for the primary.
22h 05m 50.43s +04° 51' 53.7" P.A. 195.00 sep 1.3 mag 8.36,9.13 Sp G5 dist. 186.92 pc (609.73 l.y.)

STF2857 AB: 152; 125x: Brilliant white A, wide 2 Dm B.  WDS says parallax indicates components are non-physical, but they are so wrong!  87% parallax range overlap per DR3, 2,926 AU weighted separation, 2.3+1.3 Msol, so it is likely binary.
22h 06m 10.58s +10° 05' 36.4" P.A. 113.00 sep 19.9 mag 7.14,9.80 Sp A3V+G5V dist. 109.53 pc (357.29 l.y.)

STF2859 AB: 152; 125x: Faint, very close, slightly unequal white stars.  STF2861 in the same field.  WDS uncertain, but there is -6% parallax range overlap, so in spite of the low 413 AU weighted separation, 1.1+0.9 Msol, and the radial velocity delta 0.5 being less than the escape velocity 2.9, it might not be binary.
22h 05m 58.84s +20° 36' 20.6" P.A. 344.00 sep 3.8 mag 10.01,10.65 Sp G0

STF2861 AB: 152; 125x: White, <1 Dm, well separated.  WDS uncertain, but there is 18% parallax range overlap, 1,550 AU weighted separation, 2.2+2.0 Msol, and the radial velocity delta 0.6 is less than the escape velocity 2.2, so it is probably binary.
22h 06m 01.25s +20° 48' 12.4" P.A. 221.00 sep 7.1 mag 8.14,8.64 Sp A4V dist. 187.62 pc (612.02 l.y.)

STF2867 AB: 152; 125x: Light yellow A and wide, 1 Dm B.  WDS says proper motion indicates physical.  There is 15% overlap of the parallax ranges, 2,789 AU weighted separation, 2.5+1.8 Msol, and the radial velocity delta 1.7 is the same as the escape velocity, so it is possibly binary.
22h 10m 02.85s +07° 57' 13.1" P.A. 208.00 sep 10.5 mag 8.31,9.31 Sp G5III

STF2868 AB: 152: 250x: Hairline split, slightly unequal, dull white A and blue B.  Can tell it is not single at low power.  WDS uncertain, but there is 36% overlap of the parallax ranges, only 343 AU weighted separation, 2.0+2.3 Msol, so it is possibly binary and needs an orbit.
22h 09m 22.01s +22° 32' 46.6" P.A. 352.00 sep 1.1 mag 8.87,9.38 Sp F4III dist. 237.53 pc (774.82 l.y.)

STF2869 AB: 152; 125x: Bright yellow A, B seen with averted vision only, wide.  WDS says it's physical, but there is -78% overlap of the parallax ranges, it is not binary.
22h 10m 22.02s +14° 37' 47.7" P.A. 254.00 sep 20.8 mag 6.33,12.40 Sp K0III dist. 135.69 pc (442.62 l.y.)

STF2877 AB: 152; 125x: Light yellow and 2 Dm wide blue B.  Per WDS proper motion indicates non-physical, and there is -96% overlap of the parallax ranges, it is not binary.
22h 14m 18.40s +17° 11' 21.6" P.A. 25.00 sep 24.0 mag 6.65,9.23 Sp K4IV dist. 165.84 pc (540.97 l.y.)

STF2878 AB: 152; 250x: White A and yellow B, 1 Dm, closely split.  WDS uncertain, and there is -53% parallax range overlap, it is not binary.
22h 14m 29.18s +07° 58' 34.2" P.A. 116.00 sep 1.6 mag 6.94,8.11 Sp B9IV dist. 224.22 pc (731.41 l.y.)

STF2881 AB: 152; 250x: Excellent pair, unequal and closely split.  WDS grade 4 orbit, 1345-year period.  There is 11% overlap of the parallax ranges, only 194 AU weighted separation, 2.1+1.8 Msol, so it is binary.
22h 14m 34.67s +29° 34' 20.6" P.A. 70.50 sep 1.2 mag 7.65,8.24 Sp F6III dist. 171.53 pc (559.53 l.y.)
STF2888 AB: 152; 125x: Extremely faint B pops into view with averted vision.  No record found in WDS.

STF2889 AB: 152; 250x: Very closely separated, split at high power, light orange A, 2 Dm.  WDS is uncertain, and there is -46% parallax range overlap, they are not binary.
22h 16m 19.71s +26° 16' 15.8" P.A. 198.00 sep 2.3 mag 8.49,10.15 Sp K0III dist. 377.36 pc (1230.95 l.y.)

STF2895 AB: 152; 125x: Wide 1 Dm. WDS says not physical, linear solution, and there is -92% parallax range overlap, it is not binary.
22h 20m 44.74s +24° 57' 24.7" P.A. 49.00 sep 14.0 mag 8.49,9.95 Sp K0III-IV dist. 310.56 pc (1013.05 l.y.)

STF2897 AB: 152; 125x: Wide unequal faint pair.  WDS says proper motion indicates physical, and there is 33% parallax range overlap, 4,418 AU weighted separation, 1.8+1.5 Msol, and the radial velocity delta 0.7 is less than the escape velocity 1.1, so it likely is binary.
22h 21m 48.89s +15° 15' 09.9" P.A. 98.00 sep 16.9 mag 9.48,10.37 Sp F0V+F3V

STF2898 AB: 152; 125x: Wide unqual pair.  WDS says parallax indicates physical, but there is -25% overlap of the parallax ranges, so it is not binary.
22h 22m 17.81s +11° 04' 48.6" P.A. 283.00 sep 12.6 mag 9.13,10.36 Sp F7V dist. 56.02 pc (182.74 l.y.)

STF2899 AB: 152; 125x: Wide, very faint B seen only with averted vision.  WDS says not physical, and there is -96% overlap of the parallax ranges, it is not binary.
22h 22m 34.30s +06° 28' 24.0" P.A. 34.00 sep 19.7 mag 7.30,11.20 Sp A3 dist. 103.95 pc (339.08 l.y.)

STF2901 AB: 152; 125x: Close split, 1 Dm. WDS uncertain, but there is 21% parallax range overlap, only 527 AU weighted separation, 1.5+1.3 Msol, so it is likely binary and needs an orbit.
22h 24m 27.45s +03° 49' 05.8" P.A. 149.00 sep 3.3 mag 9.22,10.05 Sp F0 dist. 228.83 pc (746.44 l.y.)

STF2905 AB: 152; 125x: Close equal pair, white.  WDS says not physical, and there is -36% parallax range overlap, it is not binary.
22h 27m 12.81s +15° 09' 12.8" P.A. 285.00 sep 3.4 mag 9.28,9.34 Sp G1V

STF2908 AB: 152; 125x: White A and light blue B, wide, 2 Dm.  WDS uncertain, but there is 4% parallax range overlap, 2,139 AU, 2.7+1.7 Msol, so it is probably binary.
22h 28m 11.55s +17° 15' 47.9" P.A. 114.00 sep 9.1 mag 7.74,9.68 Sp G9III dist. 462.96 pc (1510.18 l.y.)

STF2910 AB: 152; 125x: Light yellow A, near equal B, well split.  WDS says it's physical, and there is just 1% overlap of the parallax ranges, 273 AU weighted separation, 0.9+0.8 Msol, so it is possibly binary.
22h 28m 13.25s +23° 31' 57.2" P.A. 332.00 sep 5.8 mag 9.05,9.67 Sp K0IV dist. 51.71 pc (168.68 l.y.)

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