Saturday, October 7, 2017

catching up on doubles

In the last week I was able to observe four nights from the back yard with Big Blue, so it's been busy.  Seeing was usually indifferent, and the bright moon threw out a large haze.  But mostly these were productive and enjoyable nights.  In no particular order:

STF 2455: 277x.  Yellow and yellow-orange, 1 delta mag, very wide. [AB seen; AC wider and fainter still.] 
19H 06M 53.00S +22° 10' 21.5" P.A. 28 SEP 9.6 MAG 7.42,9.44 SP F4IV DIST. 68.59 PC (223.74 L.Y.) 

4 Vul, HJ 2871: 277x.  Light orange and very faint snar near, with another 2x fainter and farther away.  Noticed with AV only. [AB & AC seen] 
19H 25M 28.54S +19° 47' 54.7" P.A. 88 SEP 14.2 MAG 5.16,10.00 SP G9III DIST. 83.26 PC (271.59 L.Y.) 

STF 2504: 277x.  Yellow and slightly red, 2 delta mag, 10".  Third star opposite PA, 2x the separation. [AB seen.  Other is AC, WAL 111] 
19H 20M 59.85S +19° 08' 43.4" P.A. 282 SEP 8.6 MAG 7.00,9.03 SP F5V DIST. 62.7 PC (204.53 L.Y.) 

STF 2445: 277x.  Wide, 1 delta mag.  In an arc with three stars total. [4 stars visible in system] 
19H 04M 38.50S +23° 19' 45.5" P.A. 262 SEP 12.3 MAG 7.25,8.57 SP B2VE DIST. 476.19 PC (1553.33 L.Y.)  

STF 2457: 277x.  White and orange, 1 delta mag wide. 
19H 07M 08.02S +22° 35' 03.7" P.A. 200 SEP 10.4 MAG 7.46,9.52 SP A7IV DIST. 95.15 PC (310.38 L.Y.)

STF 2521: 277x.  Orange a, 1x fainter B, with two more stars about. [Not sure if seen, since the actual delta mag is 4; five stars visible] 
19H 26M 28.69S +19° 53' 29.8" P.A. 32 SEP 29.1 MAG 5.82,10.50 SP K5III DIST. 187.97 PC (613.16 L.Y.) 

STF 2426: 277x.  Near equal orange, very wide separation.  [AB seen, BC too faint] 
18H 59M 58.76S +12° 53' 24.1" P.A. 261 SEP 16.6 MAG 7.45,8.96 SP A5V+K2III DIST. 300.3 PC (979.58 L.Y.)

BU 676: 277x.  Not difficult, around 8th magnitude, 1 delta mag between the pair, 4-5" [Not seen!  Sep is 1.3" and it is much fainter.  Need better seeing & mag] 
18H 57M 11.56S +14° 49' 58.9" P.A. 80 SEP 1.3 MAG 7.26,10.34 SP G5 DIST. 212.31 PC (692.56 L.Y.)

Deneb el Okab, Bpm = Epsilon Aqul: 277x.  Orange star, some faint stars around, not clear which is the pair. [3 stars visible, all faint] 
18H 59M 37.39S +15° 04' 06.5" P.A. 185 SEP 123.4 MAG 4.13,10.56 SP K1-III DIST. 47.51 PC (154.98 L.Y.)  

STF 2424: 277x.  Orange star with very much fainter B, nearly AV only.  Very wide separation. [AB seen, AC further separation.] 
18H 59M 05.73S +13° 37' 21.2" P.A. 302 SEP 21 MAG 5.32,9.30 SP F6IV DIST. 48.43 PC (157.98 L.Y.)

STF 2489: 553x.  Bright white and considerably fainter B.  B rose up to view with averted vision, but was able to hold direct.  ~5" 
19H 16M 26.78S +14° 32' 40.6" P.A. 347 SEP 8.3 MAG 5.67,9.30 SP B9.5V DIST. 125.63 PC (409.81 L.Y.)

STF 2437: 553x.  Small faint, notched peanut when seeing stills.  Orange.  Must've been wider at discovery. [0.6" now, 1.1" at discovery -- I don't think Struve would have seen it <0.8"] 
19H 01M 53.16S +19° 10' 11.7" P.A. 4.2 SEP 0.56 MAG 8.41,8.83 SP G5 DIST. 84.39 PC (275.28 L.Y.)  

V338 Sge, BU 139: 553x.  Overlapping of messy airy disks.  Near equal wide pair in finder (STTA 177). 
19H 12M 34.45S +16° 50' 47.2" P.A. 136 SEP 0.6 MAG 7.11,7.95 SP B9IV DIST. 242.72 PC (791.75 L.Y.)

STT 375: 553x. Sense and elongation or rod, but can't quite claim it. 
19H 34M 37.45S +18° 07' 41.2" P.A. 188.1 SEP 0.6 MAG 7.72,8.88 SP G5 DIST. 233.64 PC (762.13 L.Y.)

STF 2484: 553x. Very close, ~2", orange, 1.5 delta mag. 
19H 14M 15.66S +19° 03' 50.3" P.A. 239.9 SEP 2.26 MAG 7.93,9.51 SP F8 DIST. 67.2 PC (219.21 L.Y.)

STF 2540: 552x.  Yellow and blue, pretty wide 1.5 delta mag. [AB seen; AC faint & wide] 
19H 33M 17.05S +20° 24' 50.5" P.A. 146 SEP 5.1 MAG 7.52,9.23 SP A3 DIST. 152.67 PC (498.01 L.Y.) 

STF 2585: 553x. Bright A and 3x fainter wide B.  [AB,C seen.  AB 0.2", AB,D faint and wide] 
19H 48M 58.65S +19° 08' 31.1" P.A. 311 SEP 8.4 MAG 5.04,9.01 SP A1V DIST. 78.19 PC (255.06 L.Y.) 

STF 2631: 553x.  Very nice orange and blue, a mini Alberio; a little more equal magnitude, though.  ~5", 1 delta mag. 
20H 07M 13.84S +21° 06' 13.4" P.A. 338 SEP 4.5 MAG 8.13,9.12 SP G0 DIST. 598.8 PC (1953.29 L.Y.)

STTA 177: 553x. Very wide orange-yellow and blue, ~2-3 delta mag
19H 12M 34.45S +16° 50' 47.2" P.A. 276 SEP 98.1 MAG 7.11,8.02 SP B9IV DIST. 242.72 PC (791.75 L.Y.) 

STT 368: 553x.  Very close orange, 1 delta mag, ~1.5-2".  Split but seeing is not good. [AB seen, AC wide and faint] 
19H 16M 01.84S +16° 09' 39.5" P.A. 219 SEP 1.1 MAG 7.53,8.49 SP A9IV DIST. 240.96 PC (786.01 L.Y.) 

STF 2424: 553x. For real this time; last observation was the wrong star!  Orange and blue, 2.5 delta mag, wide ~15" 
18H 59M 05.73S +13° 37' 21.2" P.A. 302 SEP 21 MAG 5.32,9.30 SP F6IV DIST. 48.43 PC (157.98 L.Y.)

BU 1471: 553x.  Very faint B, AV needed to notice, can just hold it direct.  Wide 10-12", 3 delta mag, orange A. 
19H 38M 27.48S +17° 15' 26.0" P.A. 333 SEP 13 MAG 7.51,11.86 SP B0.5V DIST. 719.42 PC (2346.75 L.Y.)

STF 2634: 553x.  Orange 1 delta mag, 5 delta mag, nice. [AB seen, AC wide and faint] 
20H 09M 34.30S +16° 48' 19.2" P.A. 14 SEP 4.1 MAG 7.77,9.92 SP K0 DIST. 23.66 PC (77.18 L.Y.) 

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