Opened the 20-inch last night. Seeing was good but not great, so I stuck to the CDSA throughout, though I used full aperture with the apodizing screen. The star images were not as clean as with the refractor, due to reflector light scatter and the larger aperture throwing off more diffraction & being more affected by seeing. It does make me a little more motivated to try to salvage the Dalton, since if the optics were fixed it would be a killer double star scope...
BU 248 AB: 508; 280x: Nice close pair, 3 Dm, white. 24% PRO, 985 AU WS, 6.5+3.0 Msol, it is possibly binary and an orbit should be tried.
19h 17m 43.64s +23° 01' 32.0" P.A. 128.00 sep 1.8 mag 5.43,8.75 Sp B0.5IV dist. 373.13 pc (1217.15 l.y.)
BU 428 AB: 508; 390x: Light orange A, B is closely split, blue-white, 2 Dm. No Gaia data for the secondary. Given the difficulty, an orbit should be tried.
20h 06m 43.37s +12° 56' 12.1" P.A. 355.00 sep 0.8 mag 7.55,9.13 Sp F4III
HEI 568 AB: 508; 1270x: 18 Aql. In good but not great seeing and with some haze in the air, with my 20-inch with apodizing screen, I could tell elongation at >600x. At 1270x and a light blue filter added, I had to overlapping hazy spurious disks (two photocenters within the notched elongation, one fainter than the other). For a couple instants it seemed to hairline split, but very briefly. PA firmly to the SW. First diffraction ring forms the outline of a peanut. SOC grade 4 orbit, 205-year period, it will turn to the south in the next 15 years. No Gaia parallax data.
19h 06m 58.60s +11° 04' 16.7" P.A. 243.00 sep 0.265" mag 5.44,6.39 Sp B8III dist. 214.13 pc (698.49 l.y.)
AGC 12 BC: 508; 500x: BC is very faint near to bright A. Above 280x, I can see it as a closely separated unequal pair, direct vision, but foveal coaxing helps. -46% PRO, it is not binary.
20h 18m 03.22s -12° 32' 47.9" P.A. 241.00 sep 1.2 mag 11.20,11.50
HWE 55 AB: 508; 140x: Easy wide pair, 4 Dm. 35% PRO, 2,605 AU WS, 2.6+0.7 Msol, it is possibly binary and needs an orbit.
20h 57m 10.57s +00° 27' 50.2" P.A. 71.00 sep 26.3 mag 6.05,11.76 Sp K2III dist. 93.98 pc (306.56 l.y.)
RST4659 AB: 508; 280x: Lovely close 2 Dm pair, white A and yellowish B. 83% PRO, 118 AU WS, 1.0+1.6 Msol, and RVD 1.8 < EV 6.2, it is very likely binary and needs an orbit.
20h 16m 50.26s -03° 29' 30.0" P.A. 7.00 sep 1.8 mag 7.16,9.19 Sp F5 dist. 64.85 pc (211.54 l.y.)
S 740 AB: 80; 13x: Finder, easy near equal wide pair. -9% PRO, it is not binary.
20h 14m 09.77s +06° 35' 20.3" P.A. 192.00 sep 43.9 mag 7.77,8.06 Sp G4IV dist. 61.12 pc (199.37 l.y.)
S 749 AB: 508; 140x: Wide, white, half delta magnitude, with string of faint stars near. -17% PRO, it is not binary.
20h 27m 27.56s -02° 06' 10.5" P.A. 189.00 sep 60.0 mag 6.76,7.51 Sp F5V+G2V+ dist. 46.9 pc (152.99 l.y.)
BU 987 AB: 508; 280x: Very faint B, fairly closely split. No Gaia parallax data for the secondary. It seems to be a bit far to be binary.
20h 30m 14.44s +19° 25' 15.7" P.A. 128.00 sep 2.5 mag 6.80,11.10 Sp B7IV dist. 386.1 pc (1259.46 l.y.)
STF2489 AB: 508; 140x: Bright white A and 3 Dm, wide, yellowish B. -60% PRO, it is not binary.
19h 16m 26.78s +14° 32' 40.6" P.A. 347.00 sep 8.3 mag 5.67,9.30 Sp B9.5V dist. 125.63 pc (409.81 l.y.)
STF2492 AB: 508; 280x: Light yellow stars, 3 Dm, well split. 54% PRO, 417 AU WS, 3.6+1.5 Msol, it is possibly binary and needs an orbit.
19h 18m 32.49s +01° 05' 06.3" P.A. 2.00 sep 3.3 mag 5.28,8.29 Sp G9III dist. 113.77 pc (371.12 l.y.)
STF2525 AB: 508; 200x: Equal yellow-white stars, nice, fairly close split. 63% PRO, 127 AU WS, 1.1+1.2 Msol, there is a SOC grade 3 orbit 510-year period.
19h 26m 33.71s +27° 19' 21.9" P.A. 290.00 sep 2.3 mag 8.19,8.39 Sp F8 dist. 64.52 pc (210.46 l.y.)
STF2643 AB: 508; 140x: White A and light orange B, 2 Dm. -15% PRO, it is not binary.
20h 12m 47.31s -02° 59' 45.4" P.A. 81.00 sep 3.0 mag 7.09,9.40 Sp A0V dist. 133.33 pc (434.92 l.y.)
STF2644 AB: 508; 140x: Bright near equal white stars. 16% PRO, 416 AU WS, 2.4+2.4 Msol, it is possibly binary and needs an orbit.
20h 12m 35.09s +00° 52' 00.2" P.A. 205.00 sep 2.6 mag 6.92,7.06 Sp B9p dist. 180.51 pc (588.82 l.y.)
STF2654 AB: 508; 140x: Unequal white stars, wide. 57% PRO, 1,299 AU WS, 1.9+1.5 Msol, RVD 1.1 < EV 2.1, it is very likely binary and needs an orbit.
20h 15m 10.63s -03° 30' 12.9" P.A. 232.00 sep 14.4 mag 6.96,8.14 Sp F2V+F4V dist. 105.82 pc (345.18 l.y.)
STF2656 AB: 508; 140x: Easy wide pair, 3 Dm. -10% PRO, it is not binary.
20h 15m 37.14s +07° 48' 32.4" P.A. 233.00 sep 9.7 mag 7.34,11.30 Sp A7III dist. 122.7 pc (400.25 l.y.)
STF2661 AB: 508; 140x: Very wide, half delta magnitude. 7% PRO, 6,556 AU WS, 2.9+1.9 Msol, RVD 1.2 > EV 1.1, it is not likely binary.
20h 19m 52.68s -02° 14' 51.0" P.A. 341.00 sep 24.4 mag 7.87,9.19 Sp A0
STF2742 AB: 508; 140x: White near equal stars, well split. 32% PRO, 332 AU WS, 1.9+1.9 Msol, it is likely binary and needs an orbit.
21h 02m 12.51s +07° 10' 47.3" P.A. 213.00 sep 3.0 mag 7.41,7.64 Sp F8 dist. 80.97 pc (264.12 l.y.)
STFA 40 AB: 508; 140x: Wide, white. -94% PRO, it is not binary.
19h 18m 50.94s +00° 20' 20.4" P.A. 316.00 sep 423.5 mag 6.52,6.78 Sp K0IIIa dist. 127.06 pc (414.47 l.y.)
STT 409 AB: 508; 140x: Easy wide pair, 4 Dm. -92% PRO, it is not binary.
20h 40m 17.64s +03° 26' 28.5" P.A. 84.00 sep 16.8 mag 7.06,10.20 Sp K0 dist. 251.26 pc (819.61 l.y.)
STT 533 AB: 508; 850x: Seems elongated but can't tell for certain. Viewed through eyepiece cap peephole. Pulls up as binary in SkyTools, but there is no designation in WDS.
STTA213 AB: 508; 140x: 3 Dm, very wide. 37% PRO, 3,316 AU WS, 1.5+0.8 Msol, but RVD 2.1 > EV 1.1, it is not binary.
20h 59m 50.85s +16° 49' 27.6" P.A. 36.00 sep 70.9 mag 6.66,9.22 Sp F4III dist. 48.1 pc (156.9 l.y.)
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