Wednesday, July 31, 2019

ophiuchus doubles

I almost didn't observe last night; I saw a lot of scintillation when I went outside.  But I opened up anyhow and looked at Jupiter.  It was surprisingly good, with moments of sharpness.  I used binoviewers and the apodizing mask.  I did a brief experiment where I turned the suspended boundary layer fan on and off; my impression was the on hurt the view, either from turbulence or vibration.  I need to run more tests but for now I'm thinking to take it out and just use a fan attached to one of the truss poles to blow down during cool down.

I thought to look at some of the pretty clusters in Ophiuchus, and that started me on to looking at some doubles.  Seeing 6-7/10, Transparency 3/5 with marine haze.

STF 2166: White and slight off-white wide separation B.  8" 333x.
17h 27m 52.25s +11° 23' 25.8" P.A. 282 sep 27.2 mag 7.15,8.58 Sp A5V dist. 115.07 pc (375.36 l.y.)

STF 2185: Finder split but the actual pair is probably the faint star to the side of one of these seen in the scope, 2 delta mag, wide, 8" 333x. [AB seen; many other pairings. CDSA" High CPM, solar type (2)+1 triple, AB ps = 3,440 AU 2013)."]
17h 34m 48.53s +06° 01' 25.8" P.A. 5 sep 27.2 mag 7.46,10.32 Sp F8 dist. 91.07 pc (297.07 l.y.)

Shy 726: Pretty yellowish-white A star and a very wide separated 1 delta mag bluish B.  Two more faint stars bracket the pair, wider, might be part of the system. 8" 333x
17h 33m 52.81s +08° 06' 13.5" P.A. 12 sep 228 mag 7.92,8.59 Sp G0+G dist. 84.1 pc (274.33 l.y.)

STF 2186: near equal, well separated.  8" 333x
17h 35m 50.43s +00° 59' 47.7" P.A. 78 sep 3 mag 8.23,8.43 Sp B8IV dist. 302.11 pc (985.48 l.y.)

Sh 251: Orange stars, finder split, 1.5 delta mag.  A star feels not round at 8" 333x & 667x & 20" 667x, though the 20" had too much diffraction.  [No close to A]
17h 39m 08.48s +02° 01' 41.2" P.A. 328 sep 110.8 mag 6.37,7.78 Sp K0III dist. 112.99 pc (368.57 l.y.)

STT 331: Slight red and pale blue, half delta mag, very tight ~1". Maybe +1 with wide star as faint as B. [AB tight pair, AC wide]
17h 32m 02.86s +02° 49' 25.4" P.A. 351 sep 1 mag 7.74,8.82 Sp B5V dist. 476.19 pc (1553.33 l.y.)

30 Oph: Orange star with several very wide faint stars which might be paired.
ENG 59 AB: 17h 01m 03.60s -04° 13' 21.5" P.A. 68 sep 100.4 mag 4.99,9.71 Sp K4III dist. 124.22 pc (405.21 l.y.)
ARN 16 AC: 17h 01m 03.60s -04° 13' 21.5" P.A. 85 sep 221 mag 4.99,8.75 Sp K4III dist. 124.22 pc (405.21 l.y.)

STF 2122: Pale yellow and wide separated B, 2 delta mag.
17h 06m 52.94s -01° 39' 22.0" P.A. 279 sep 20.3 mag 6.38,9.73 Sp A8V+G5V dist. 90.5 pc (295.21 l.y.)

A1145: Faint wide which might be B to the bright A.  I have marginal observation of a very faint, very close-in star which briefly resolves as a point and not a flare.  8" 667x. 20" seeing too messy. [Marginal.  What I saw seemed further separated than 0.67", though it might have been. Need a better seeing night.]
17h 08m 13.65s -01° 04' 46.1" P.A. 339.8 sep 0.67 mag 6.32,7.75 Sp A1V+F3V dist. 89.53 pc (292.05 l.y.)

A2984: Bright orange star. There are some faint stars about especially as revealed by the 20", but not certain which would be a pair.  A feels not round but uncertain.  8" 667x. [Not seen, or marginal detection of close pair -- need better seeing.]
17h 16m 36.69s -00° 26' 43.1" P.A. 22.7 sep 0.69 mag 4.92,7.51 Sp K1IV dist. 63.09 pc (205.8 l.y.)

Rag 9: Light orange star, with some faint stars nearby. [AB seen.  AC is 0.7" 11.9/12.0 and definitely worth another look! CDSA: "Local, solar type 1+2 triple with low mass binary companion, sparse field.  AB ps = 1,120 AU (2012)."]
17h 22m 51.29s -02° 23' 17.4" P.A. 146 sep 46.3 mag 6.30,11.90 Sp G3V+M3V dist. 19.52 pc (63.67 l.y.)
BU 1089: 8" 667x: Very fine point resolves next to a much brighter star. Well separated but a fine sight.  With seeing.
17h 29m 47.34s -05° 55' 10.1" P.A. 321 sep 1.4 mag 6.57,8.98 Sp G8IV dist. 78.99 pc (257.67 l.y.)

STF 2191: Wide separation near equal 8" 667x [AB seen. BC is Ho 419 12.71 7.6"]
17h 39m 47.28s -04° 58' 04.8" P.A. 267 sep 26.3 mag 7.83,8.47 Sp F2V dist. 140.45 pc (458.15 l.y.)

STF 2202: half delta mag wide separation white. 8" 667x [AB]
17h 44m 34.09s +02° 34' 45.9" P.A. 94 sep 20.8 mag 6.13,6.47 Sp A1IV-V dist. 84.82 pc (276.68 l.y.)

BU xxxx: Light orange star, wide separation, 1-2 delta mag, blue B?

STF 2223: Wide separation 1.5 delta mag. [A passenger jet, probably 10k feet up, flew through the finder as I was pulling this up -- thought I'd have to view this star through its turbulence, and the seeing did seem poorer!]
17h 48m 57.84s +04° 58' 03.2" P.A. 211 sep 18.3 mag 7.56,9.66 Sp F0V dist. 86.51 pc (282.2 l.y.)

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