Seeing was predicted to be "above average" last night, so I opened up the 20-inch. I knew not to expect too much. Seeing was variable, as expected, worst in lower elevations of course. I masked to 7-inches and sometimes went full aperture depending on the star, and spent a lot of time at lower elevations in Libra and Scorpio with CDSA pairs, since there are holes in my observing list in these constellations. I'm contemplating bringing my C8 out to a dark sky and just observing doubles, just to make up for all that's missing.
SHJ 186 AB: 178; 150x: Zubenelgenubi. White, super wide, 1 Dm, 150x. No parallax data for the primary.
14h 50m 52.78s -16° 02' 29.8" P.A. 314.00 sep 231.1 mag 2.74,5.19 Sp A3IV+F4IV dist. 23.24 pc (75.81 l.y.)
BU 106 AB: 178; 200x: White stars, 1 Dm, close split with 150x, better seen 200x. No Gaia parallax data for the primary. SOC grade 4 orbit, 614-year period
14h 49m 19.09s -14° 08' 56.3" P.A. 7.00 sep 1.9 mag 5.61,6.62 Sp A1pSrCrEu dist. 72.94 pc (237.93 l.y.)
HLD 20 AB: 508; 280x: Light orange A star, B is very faint, fairly closely split, seen with foveal coaxing. No parallax data for the secondary.
14h 45m 57.78s -15° 27' 34.4" P.A. 250.00 sep 3.1 mag 6.48,10.10 Sp K1III dist. 444.44 pc (1449.76 l.y.)
BU 35 AB: 178; 390x: Very tough, can see a small brightening in the first diffraction ring. 71% PRO, 123 AU WS, 1.1+1.5 Msol, it is likely binary and needs an orbit.
15h 42m 46.42s -16° 00' 48.9" P.A. 111.00 sep 1.6 mag 7.27,8.69 Sp F7IV dist. 64.14 pc (209.22 l.y.)
STF3091 AB: 508; 850x: Just split with seeing, N-S PA, 1 Dm, very tough. No Gaia parallax data for either star. SOC grade 2 orbit, 143.22-year period, it is currently SSW and closing to periastron in 2028, and barely detectible again in 2040.
15h 16m 01.56s -04° 53' 52.3" P.A. 226.00 sep 0.4 mag 7.74,8.48 Sp F7V dist. 62.54 pc (204.01 l.y.)
BU 119 AB: 178; 150x: Easy, clean white stars, well separated, 1 Dm. 93% PRO, 117 AU WS, 1.1+1.0 Msol, RVD 0.6 < EV 5.7, it is certainly binary. SOC grade 4 orbit, 1348-year period.
15h 05m 31.91s -07° 00' 48.8" P.A. 274.00 sep 2.3 mag 8.09,8.76 Sp G0 dist. 47.6 pc (155.27 l.y.)
BVD 108 AB: 178; 150x: Slightly orange-red A, with very wide faint B. -71% PRO, it is not binary.
14h 38m 04.28s -09° 44' 16.4" P.A. 279.00 sep 46.1 mag 7.68,10.06 Sp M1III dist. 1176.47 pc (3837.65 l.y.)
S 665 AB: AB: 178; 150x: Wide, 1 Dm. 32% PRO, 9,260 AU WS, 3.3+2.6 Msol, RVD 1.0 < EV 1.1, it might be binary and needs an orbit tried.
15h 04m 30.89s -17° 54' 13.0" P.A. 91.00 sep 25.1 mag 8.07,8.88 Sp K2IIICN dist. 515.46 pc (1681.43 l.y.)
SHJ 195 AB: 178; 150x: Wide, white, nearly 2 Dm. 83% PRO, 3,041 AU WS, 1.7+1.1 Msol, but RVD 1.8 > EV 1.3, it is not likely binary.
15h 14m 28.13s -18° 25' 42.7" P.A. 141.00 sep 47.5 mag 6.79,8.32 Sp F5V+F5 dist. 70.03 pc (228.44 l.y.)
BU 122 AB: 178; 150x: Lovely close white pair, near equal. 28% PRO, 120 AU WS, 1.4+1.4 Msol, it is likely binary and needs an orbit.
15h 39m 54.55s -19° 46' 08.3" P.A. 228.00 sep 1.7 mag 7.65,7.67 Sp F5V dist. 57.21 pc (186.62 l.y.)
SHJ 213 AB: 178; 150x: Near equal white, wide. 97% PRO, 2,023 AU WS, 1.6+1.5 Msol, RVD 0.2 < EV 1.7, it is likely binary and needs an orbit.
15h 59m 07.80s -19° 56' 19.5" P.A. 318.00 sep 17.8 mag 8.11,8.50 Sp A5/7V
SHJ 179 AB: 178; 150x: Wide, white stars, 1 Dm. 48% AU WS, 6,253 AU WS, 2.8+2.4 Msol, it might be binary and needs an orbit.
14h 25m 29.91s -19° 58' 11.8" P.A. 296.00 sep 35.0 mag 6.61,7.16 Sp A2V dist. 127.88 pc (417.14 l.y.)
BU 225 BC: 508; 250x: Component of SHJ 179. With the larger aperture, can better resolve the 1 Dm very close 1 Dm pair which was only hinted at with 7-inch. No parallax data for C, but it may possibly be binary and needs an orbit.
14h 25m 27.65s -19° 57' 56.9" P.A. 86.00 sep 1.3 mag 7.16,8.37 Sp A4V dist. 138.89 pc (453.06 l.y.)
S 672 AB: 178; 150x: Well split 2 Dm. 72% PRO, 979 AU WS, 2.1+1.2 Msol, RVD 2.2 < EV 2.4, it is probably binary and needs an orbit tried.
15h 31m 43.41s -20° 09' 53.7" P.A. 280.00 sep 11.2 mag 6.31,8.94 Sp A8V dist. 75.76 pc (247.13 l.y.)
H N 28 AB: 178; 150x: Light yellow-orange, wide, 1 Dm. No Gaia data for the primary. WDS notes reference research it is not binary. Only 19 light years distant!
14h 57m 28.00s -21° 24' 55.7" P.A. 307.00 sep 26.2 mag 5.88,8.18 Sp K5Ve+M2V dist. 5.84 pc (19.05 l.y.)
HJ 4769 AB: 178; 125x: Faint, unequal, wide. 64% PRO, 1,733 AU WS, 2.3+1.5 Msol, it is possibly binary and needs an orbit.
15h 25m 22.58s -21° 55' 45.3" P.A. 192.00 sep 9.7 mag 7.86,9.69 Sp K0III dist. 209.64 pc (683.85 l.y.)
BU 348 AB: 508; 850x: Light orange stars, > 1 Dm, snowman to hairline split at in best moments. No Gaia data for the secondary. Burnham noticed little change since his discovery to his General Catalog, and notes "There can be no doubt of the physical relation of these stars, but the period will certainly be long."
15h 01m 48.92s -00° 08' 24.9" P.A. 108.00 sep 0.5 mag 6.13,7.49 Sp M0.5IIb dist. 704.23 pc (2297.2 l.y.)
BU 349 AB: 178; 200x: Very fine pair, white B, faint B seen direct, well separated. 50% PRO, 291 AU WS, 1.6+0.8 Msol, RVD 2.8 < EV 3.8, it is certainly binary and needs an orbit.
15h 08m 57.33s +01° 41' 21.4" P.A. 38.00 sep 3.4 mag 7.59,10.94 Sp F1V dist. 88.65 pc (289.18 l.y.)
BU 943 AB: 178; 150x: Nice pale yellow A, 3 Dm B, well separated. 81% PRO, 521 AU WS, 3.1+1.1 Msol, it is very likely binary and needs an orbit.
15h 18m 22.64s +00° 56' 21.9" P.A. 92.00 sep 3.0 mag 6.66,10.88 Sp K1III dist. 178.25 pc (581.45 l.y.)
BU 32 AB: 178; 150x: Quite bright A, 3 Dm B, well separated. -32% PRO, it is not binary. Burnham thought it was physical based on CPM, but time has proven otherwise.
15h 21m 02.00s +00° 42' 55.2" P.A. 23.00 sep 3.4 mag 5.53,8.78 Sp K2III dist. 73.37 pc (239.33 l.y.)
BU 36 AB: 178; 200x: Difficult in poor seeing, using medium power to reduce diffraction. B resolves from a brightening to a point just outside A's diffraction, very faint. -24% PRO, it is not binary. Burnham felt it was physical based on CPM, but time has proven otherwise.
15h 53m 36.72s -25° 19' 37.7" P.A. 273.00 sep 2.0 mag 4.69,6.98 Sp B2.5Vn dist. 154.08 pc (502.61 l.y.)
STF2003 AB: 178; 150x: Faint, wide, 3 Dm. 74% PRO, 2,214 AU WS, 2.6+1.1 Msol, but the RVD 4.1 > EV 1.7, it is not binary.
16h 03m 39.61s +11° 26' 00.8" P.A. 171.00 sep 14.1 mag 7.27,10.47 Sp K3III dist. 132.8 pc (433.19 l.y.)
BU 39 AB: 178; 200x: Wow! Extraordinarily fine B due west of bright pure white A -- B is very faint, just a small white dot. 14% PRO, 413 AU WS, 2.9+1.2 Msol, it is very likely binary and needs an orbit. Burnham noted the CPM, an asserted "It will be shown to be a physical system, but of long period."
16h 07m 36.42s -12° 44' 43.4" P.A. 259.00 sep 3.3 mag 5.77,9.77 Sp B9.5Vnn dist. 112.36 pc (366.52 l.y.)
BU 120 AB: 178; 280x: Amazing double-double system. White stars, the brighter pair is 1 Dm, good clean split. The other is fainter, cleanly split around the same separation, near equal. They are nearly 90-degrees different in PA. It started as a Herschel pair, H 5 6 AC. Mitchel discovered CD in 1846 at Cincinatti with the Merz and Mahler 11-inch refractor. Burnham discovered AB with his 6-inch in 1874. Burnham noted no change in the separation or PA of either pair in his General Catalog, but presumed it was a physical system due to CPM, and says "it is in the midst of a complex nebulous area discovered by Barnard" (Rho Ophiuchi, and specifically the area known today as the "Blue Horsehead." What's missing from Burnham's analysis is parallax, and of course he'd have to wait for Gaia for that. What Gaia DR3 shows is BU 120 AB shares only 4% of its parallax range (ie. A's parallax with +/- error range overlapping B's) -- which means they are probably too far from each other in line of sight to be gravitationally bound. MTL 2 CD's parallax ranges don't overlap at all, -11%, and there is even less probability it can be gravitationally bound. So, we have a CPM system -- wonderful all the same, and definitely worth the effort to see.
AB has 4% PRO but 3% error, 175 AU WS, 4.3+3.3 Msol, it might or might not be binary. CD has -11% PRO with no error, 321 AU WS, and probably is not binary.
BU 120 AB: 16h 11m 59.74s -19° 27' 38.3" P.A. 1.00 sep 1.4 mag 4.35,5.31 Sp B2IV dist. 145.35 pc (474.13 l.y.)
MTL 2 CD: 16h 11m 58.60s -19° 27' 00.1" P.A. 55.00 sep 2.4 mag 6.60,7.23 Sp B8/9V
STF2031 AB: 178; 150x: Bright white and 2 Dm B, wide. 26% PRO, 921 AU WS, 1.3+0.6 Msol, but RVD 3.0 > EV 1.9, it is not likely binary
16h 11m 59.74s -19° 27' 38.3" P.A. 1.00 sep 1.4 mag 4.35,5.31 Sp B2IV dist. 145.35 pc (474.13 l.y.)
STF2041 AB: 178; 280x: Pretty, 3 Dm, closely separated. -47% PRO, it is not binary.
16h 21m 47.96s +01° 12' 56.4" P.A. 1.00 sep 2.6 mag 7.51,10.54 Sp K0
STF2055 AB: 178; 280x: 1 Dm white stars, close split. No Gaia parallax data for either star. SOC grade 2 orbit, 129-year period, it will make a counterclockwise turn from NE to E by 2050, closing slightly.
16h 30m 54.84s +01° 59' 02.8" P.A. 44.00 sep 1.4 mag 4.15,5.15 Sp A0V+A0V dist. 53.08 pc (173.15 l.y.)
HO 407 AB: 178; 150x: Faint B around 4 Dm, wide. -34% PRO, it is not binary.
16h 32m 55.73s -10° 33' 45.1" P.A. 218.00 sep 14.6 mag 6.87,11.80 Sp A9V dist. 85.47 pc (278.8 l.y.)
STT 585 AB 178; 150x: Three stars forming a triangle, with one fainter inside of it... -94% PRO for the AB pair, and none of the other stars overlap either.
16h 44m 59.98s +06° 05' 17.3" P.A. 191.00 sep 163.1 mag 6.66,10.40 Sp K0V+K3V dist. 45.87 pc (149.63 l.y.)
STF2114 AB: 178; 280x: Very fine unequal pair. 11% PRO, 149 AU WS, 2.2+1.8 Msol, it is possibly binary and needs an orbit.
17h 01m 58.97s +08° 27' 02.1" P.A. 196.00 sep 1.2 mag 6.72,7.61 Sp A4V dist. 121.21 pc (395.39 l.y.)
A 1145 AB: 508; 1016x: B hides in A's diffraction to the NNW, pretty well separated at 1000x. 850x it appears sharper as a white point but still in A's diffraction, significant delta magnitude. No Gaia data for the secondary. SOC grade 3 orbit, 206-year period, it will move very slightly to the NW by 2050.
17h 08m 13.65s -01° 04' 46.1" P.A. 340.00 sep 0.7 mag 6.32,7.75 Sp A1V+F3V dist. 89.53 pc (292.05 l.y.)
BU 1118 AB: 508; 1200x: Appears single at all powers, bright white. No Gaia data for the secondary. SOC grade 2 orbit, 87.58-year period, it is near periastron now, need to reobserve in the 2030s when it should be detectible ~0.3".
17h 10m 22.66s -15° 43' 30.5" P.A. 225.00 sep 0.4 mag 3.05,3.27 Sp A1IV+A1IV dist. 27.09 pc (88.37 l.y.)
BU 1117 AB: 178; 280x: = HO 265. Fine near equal white stars, closely split. -71% PRO, it is not binary! In spite of the SOC grade 4 orbit, 1096-year period.
16h 56m 48.01s -23° 09' 01.0" P.A. 304.00 sep 1.0 mag 6.25,6.32 Sp A0V dist. 93.11 pc (303.72 l.y.)
SHJ 240 AB: 178; 150x: Unequal, well split, white. -56% PRO, it is not binary.
16h 57m 04.00s -19° 32' 23.5" P.A. 233.00 sep 4.4 mag 6.59,7.59 Sp B6V+B7V dist. 177.62 pc (579.4 l.y.)
STT 315 AB: 178; 420x: Hairline split, white A and B appears pale blue. No Gaia data for the secondary. SOC grade 4 orbit, 990-year period. Time will tell.
16h 51m 24.94s +01° 12' 57.5" P.A. 309.00 sep 0.8 mag 5.78,7.26 Sp A2Vs dist. 116.14 pc (378.85 l.y.)
BU 125 AB: 178; 200x: With seeing, very fine B is very closely split. -18% PRO, it is not binary. Burnham admits "further measurements are necessary to show whether or not there is any relative motion."
17h 12m 10.97s -27° 02' 31.7" P.A. 66.00 sep 1.8 mag 6.92,9.65 Sp G8IV dist. 140.85 pc (459.45 l.y.)
A 2984 AB: 508; 850x: Mostly seen as single, but at best moments it appears very subtly out of round to the ENE, difficult, light orange stars. No Gaia data for the secondary. SOC grade 3 orbit, 140.76-year period, it will rush to periastron the next few years and not be resolvable again until the late 2030s.
17h 16m 36.69s -00° 26' 43.1" P.A. 27.00 sep 0.7 mag 4.92,7.51 Sp K1IV dist. 63.09 pc (205.8 l.y.)
17h 19m 53.35s -17° 45' 23.3" P.A. 265.00 sep 2.4 mag 6.34,7.56 Sp A2Vnn dist. 115.21 pc (375.82 l.y.)
RAG 9 AB & RAO 19 BC: 508; 850x: Bright light orange A. BC is blue, and very wide from A. With more magnification, BC appears hazy but elongated, with best attention and seeing have bipolar brightening, which does not quite resolve to points. AB have 47% PRO, 951 AU WS, 1.0+0.3 Msol, and is likely binary. BC has 86% PRO, only 18 (!) PRO, 0.3+0.3 Msol, and is also likely binary.
RAG 9: 17h 22m 51.29s -02° 23' 17.4" P.A. 147.00 sep 48.9 mag 6.30,11.90 Sp G3V+M3V dist. 19.52 pc (63.67 l.y.)
RAO 19: 17h 22m 53.05s -02° 23' 58.2" P.A. 93.00 sep 0.7 mag 11.90,12.00 Sp M3V
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