A clear night, finally, with predicted above average transparency and above-average seeing. I opened the 20-inch full of hope to chase after movement pairs. I did so, trying for Rigel, Sigma Orionis, and Procyon during the early evening. I have elongation of Rigel, no success on Sigma or Procyon. It eludes me by I can't see Procyon. I did get a couple very tight movement pairs early in the night, but both transparency and seeing gradually became worse, I had pointing accuracy problems, and even stiction. I sprayed the alt and az with lubricant, but it was so free now the scope nearly crashed as the OTA tipped forward, making the mirror pop from its cell with a worrying clang. No damage done, luckily. I felt good to be outside, but I would have wished for more success observing. I alternated between 20-inch with apodising screen and the 7-inch off-axis mask.
I will confirm: refractors give much better star images and contrast than even the best reflectors (and my mirror is near perfect). I could tell the difference all night long.
A 2123 AB: 508; 1016x: Some atmospheric dispersion causing red and blue haze at either end, but I clearly see two distinct photocenters hairline split inside of the haze, not quite N-S PA. SOC grade 3 orbit, 80.94-year period, currently 0.337" and narrowing to the east by 2050, and likely undetectable.
07h 17m 06.96s -12° 02' 01.6" P.A. 3.00 sep 0.337" mag 8.61,6.96 Sp F5V dist. 46.3 pc (151.03 l.y.)
BU 599 AB: 178; 280x: 65 Leo. Very faint B glimpsed well outside of A's diffraction pattern, with seeing, best with 200-280x. 26% PRO, 164 AU WS, 2.2+0.8 Msol, and a positive PMV. It is possibly binary, and an orbit can be tried.
11h 06m 54.20s +01° 57' 19.9" P.A. 107.00 sep 2.8 mag 5.65,9.72 Sp G9IIICN dist. 63.21 pc (206.19 l.y.)
HUT 1 Ca-Cb: 508; 1270x: Component of Zeta CnC. Very difficult, very weak lopsidedness to the NW. SOC grade 4 orbit, 17.3-year period. The orbit is nearly circular and will turn to due south by 2031.
08h 12m 13.27s +17° 38' 51.6" P.A. 344.00 sep 0.3 mag 6.20,7.10 Sp M1 dist. 25.08 pc (81.81 l.y.)
S 617 AB: 178; 140x: Light cream-yellow A and wide, 2 Dm blue B. No parallax from the primary.
10h 53m 24.96s -02° 15' 18.8" P.A. 178.00 sep 35.2 mag 6.22,8.71 Sp G9IV dist. 79.3 pc (258.68 l.y.)
STF1500 AB: 178; 280x: Close white unequal pair. 12% PRO, 81 AU WS, 1.2+1.1 Msol, low positive PMV. It might be binary. SOC grade 4 orbit, 680-year period.
11h 00m 02.02s -03° 28' 16.5" P.A. 299.00 sep 1.3 mag 7.91,8.27 Sp F8V dist. 53.59 pc (174.81 l.y.)
STF1504 AB: 178; 200x: Close white equal pair, very nice. 42% PRO, 234 AU WS, 2.1+2.1 Msol, but a negative PMV. An orbit could be tried but chances are low it's binary.
11h 03m 58.93s +03° 38' 19.3" P.A. 126.00 sep 1.2 mag 7.92,8.05 Sp F0 dist. 221.73 pc (723.28 l.y.)
STF1506 A-BC: 178; 140x: HH Leo. White A and wide, 3 Dm B. No Gaia data.
11h 04m 41.47s -04° 13' 15.9" P.A. 221.00 sep 11.8 mag 7.68,10.15 Sp G5 dist. 26.27 pc (85.69 l.y.)
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