Monday, May 22, 2023

18 may 2023

Observed through the 6-inch, with a few viewed with the 60mm.  Seeing was forecast to be better than it was.  With it staying lighter later, there was less time to observe.  Izar appeared best through the 60mm through medium to high magnification -- even in the 6-inch there was significant flaring of the primary.  I'm glad I added the 60mm to my repertoire. 

STF1691 AB: 152; 125x: 1 Dm, wide.  99% PRO, 2,660 AU WS, 1.6+1.2 Msol, and the 1.1 RVD vs 1.4 ES indicates it's binary, and an orbit should be tried.
12h 54m 59.60s +58° 09' 37.6" P.A. 276.00 sep 18.7 mag 8.58,9.80 Sp F0IV dist. 68.17 pc (222.37 l.y.)

STF1785 AB: 152; 125x: Suspected double in the 60mm scope, in the 6-inch they are pretty light orange stars, 1 Dm, closely split.  47% PRO, 40 AU WS, 0.7+0.6 Msol, it is binary and has a SOC grade 2 orbit, 156-year period.
13h 49m 04.00s +26° 58' 47.7" P.A. 191.40 sep 2.7 mag 7.36,8.15 Sp K4V+K6V dist. 13.41 pc (43.74 l.y.)
STF1779 AB: 152; 300x: Faint, visible with seeing and high power, white stars, separated, nearly 1 Dm.  88% PRO, 1,135 AU WS, 2.0+1.5 Msol, it is likely binary and needs an orbit.
13h 44m 33.98s +23° 40' 06.0" P.A. 145.00 sep 3.8 mag 9.26,10.37 Sp A5 dist. 775.19 pc (2528.67 l.y.)

STF1772 AB: 152; 125x: Bright white and quite a bit fainter B, closely separated, but wide enough for the large delta mag not to be a problem.  -13% PRO, so in spite of the other factors (447 AU WS, 2.5:1.1 Msol), it is not likely binary.
13h 40m 40.50s +19° 57' 20.4" P.A. 133.00 sep 4.4 mag 5.76,9.60 Sp A1V dist. 100.6 pc (328.16 l.y.)

STF1782 AB: 152; 125x: Wide, 1 Dm, light yellow A and blue B. -32% PRO, it is not binary.
13h 45m 06.87s +18° 22' 04.3" P.A. 185.00 sep 30.4 mag 7.98,9.81 Sp F5

STF1773 AB: 152; 125x: B seen with averted vision only, wide.  -98% PRO, it is not binary.
13h 41m 38.19s +07° 36' 21.3" P.A. 209.00 sep 30.6 mag 9.95,10.00 Sp F7V

STF1792 AB: 152; 200x: B seen with averted vision, need higher powers to see it and split from A.  -50% PRO, it is not binary.
13h 57m 03.72s +12° 27' 03.5" P.A. 291.00 sep 2.3 mag 9.98,10.89 Sp F8 dist. 1470.59 pc (4797.06 l.y.)

STF1791 AB: 152; 125x: Wide, nearly 1 Dm.  No parallax data for the primary.
13h 56m 49.22s +14° 25' 58.6" P.A. 159.00 sep 21.0 mag 9.39,10.73 Sp F7V+G1IV

STF1794 AB: 152; 300x: Excellent pair, white stars, significant delta, suspected with 125x, suspected 125x, split 200x, best 300x, with seeing.  73% PRO, 252 AU WS, 1.3+1.2 Msol, it is likely binary and needs an orbit.
13h 59m 48.26s +19° 52' 57.8" P.A. 125.00 sep 1.8 mag 9.48,9.65 Sp F8 dist. 151.29 pc (493.51 l.y.)

STF1793 AB: 152; 125x: Lovely cream-colored A and yellow B, close separation, 1 Dm.  1% PRO, 85 AU WS, 2.3+1.8 Msol, there is some chance it is binary, and an orbit should be tried.
13h 59m 05.25s +25° 48' 57.6" P.A. 243.00 sep 4.8 mag 7.46,8.39 Sp A5V dist. 153.61 pc (501.08 l.y.)

STF1839 AB: 152; 125x: Near equal, wide.  42% PRO, 1,989 AU WS, 1.5+1.5 Msol, and 0.1 RVD vs 1.7 EV, indicates it is binary and an orbit is needed.
14h 21m 27.38s +53° 53' 50.9" P.A. 83.00 sep 14.5 mag 8.84,8.92 Sp G0 dist. 178.89 pc (583.54 l.y.)

STF1821 AB: 152; 125x: Yellow A and blue B, wide, 2 Dm.  No parallax data for the secondary.
14h 13m 29.00s +51° 47' 23.8" P.A. 235.00 sep 13.8 mag 4.53,6.62 Sp A7V+F1V dist. 50.1 pc (163.43 l.y.)

STF1871 AB: 152; 125x: Very fine near equal light orange stars, closely split.  -75% PRO, it is not binary.
14h 41m 35.50s +51° 23' 51.3" P.A. 313.10 sep 1.9 mag 8.02,8.07 Sp F3V dist. 99.3 pc (323.92 l.y.)

STF1889 AB: 152; 125x: Pretty pair, white A and dull white B, nearly 1 Dm, wide.  -98% PRO, it is not binary.
14h 49m 32.37s +51° 22' 28.2" P.A. 93.00 sep 15.1 mag 6.53,9.64 Sp F3V dist. 57.11 pc (186.29 l.y.)

STF1829 AB: 152; 125x: Excellent pair, white stars, nearly 1 Dm, good close split.  27% PRO, 825 AU WS, 1.9+1.6 Msol, and 0.7 RVD vs 2.7 EV, it is likely binary and needs an orbit.
14h 15m 27.95s +50° 26' 24.6" P.A. 151.00 sep 5.6 mag 8.10,8.63 Sp F5 dist. 160.51 pc (523.58 l.y.)

STF1814 AB: 152; 125x: Near equal white stars, wide.  83% PRO, 1,304 AU WS, 1.3+1.1, RVD 0.6 vs EV 1.8, it is likely binary and needs an orbit.
14h 11m 00.99s +50° 15' 08.3" P.A. 256.00 sep 11.2 mag 9.25,9.83 Sp G5+G5

STF1890 AB: 152; 125x: Wonderful near equal yellow-white stars, tightly split with low power.  36% PRO, only 185 AU WS, 1.9+1.8 Msol, so it is likely binary.  Grade 4 SOC orbit.
14h 49m 41.37s +48° 43' 15.6" P.A. 46.00 sep 2.5 mag 6.31,6.67 Sp F6V+F5V dist. 68.59 pc (223.74 l.y.)
STF1834 AB: 152; 200x: Split at 125x, better viewed with 200x, 1 Dm closely split pair, really nice.  -12% PRO, it is not binary.
14h 20m 17.60s +48° 30' 25.1" P.A. 103.50 sep 1.6 mag 8.09,8.29 Sp F9V dist. 75.36 pc (245.82 l.y.)

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