Sunday, January 17, 2021

16 january 2021

Started out at 20-inches but masked down to 7-inches pretty quickly since seeing did not hold.  I think my 8-inch mask might vignette a bit with the secondary and the edge of the primary, so I made a 7-inch mask.  Besides the 7-inch works out to a f/15 focal ratio -- a good common number. 

A 2345 AB: 508; 333x: The faint companion is just split with seeing, ~1 delta mag, very tight <1".  Physical with a 959-year period.  The PA is currently precisely to the south.
03h 27m 32.03s +19° 11' 13.4" P.A. 178.90 sep 1.0 mag 9.66,10.58 Sp G0 dist. 183.49 pc (598.54 l.y.)
STT 57 CD; 508; 205x: Part of a wide bright pair (AB), this is a large delta mag, pretty wide, attractive pair
03h 33m 26.53s +23° 23' 03.5" P.A. 321.00 sep 10.0 mag 7.67,12.00 Sp G5

STF 414 AB: 508; 205x: Near equal white pair, well split.  Physical.
03h 34m 27.73s +19° 47' 52.4" P.A. 187.00 sep 7.5 mag 8.15,8.28 Sp A0

STF 420 AB: 508; 205x: Almost 3 delta mag, well split, light yellow stars.
03h 36m 29.66s +23° 54' 45.5" P.A. 113.00 sep 6.7 mag 8.72,11.00 Sp G0

PAT 1 AB: 508; 205x: Listed as kyTools as a 9th magnitude pair but no magnitude given for B.  I only see it as single.  No wonder, as WDS's note is B is visible in infrared K-band.  Patience, J., Ghez, A.M., Reid, I., published in the late 1990s.
03h 37m 34.98s +21° 20' 35.4" P.A. 233.00 sep 0.5 mag 7.80,10.40 Sp G5 dist. 39.71 pc (129.53 l.y.)

STF 450 AB: 178; 205x: Pretty blue-white A and lightly red B pair, wide, large delta mag ~3.
03h 47m 24.41s +23° 54' 52.8" P.A. 263.00 sep 5.7 mag 7.29,9.40 Sp A2V

LOH 1 AB: 178; 205x: Faint pair, slight delta between them, well separated.   One of the base stars forming a pointed triangle.  This is Wilhelm Oswald Lohse's one and only double star discovery, Publications of the Observatory of Potsdam 20, #58, 1908.  He has craters on both the moon and Mars named for him.  
03h 48m 08.14s +22° 33' 32.3" P.A. 132.00 sep 9.3 mag 10.00,11.50

STF 453 Aa-Ab: 178; 533x: I see an out of roundness in the A star, bright white.  There are many more pairings, many HLs (Asaph Hall).   
03h 49m 09.73s +24° 03' 12.7" P.A. 40.00 sep 0.5 mag 3.80,6.80 Sp B8III dist. 117.23 pc (382.4 l.y.)
 
STT 64 AB: 178; 205x: Significantly fainter ~4 delta mag B, wide, it's a tiny white dot to bright white A.  
03h 49m 58.06s +23° 50' 55.3" P.A. 235.00 sep 3.3 mag 6.81,10.15 Sp B9.5Vp dist. 146.84 pc (478.99 l.y.)

STF 457 AB: 178; 205x: Very finely split at 205x, better split--but more dependent on seeing--with 333x. Equal pair, faint.
03h 50m 19.66s +22° 40' 41.6" P.A. 91.00 sep 0.7 mag 9.31,9.44 Sp F5

STT 65 AB: 178; 333x: Notched snowman, B is a little bluish to white A, can tell orientation, short period with PA to the SW (correct!).  61.2-year period, it will soon be at apastron.  Given it's nearly edge-on orbit, I won't see significant change, except for a slightly better split, in my time.
03h 50m 18.91s +25° 34' 46.7" P.A. 202.60 sep 0.6 mag 5.73,6.52 Sp A2V+A5V dist. 56.47 pc (184.21 l.y.)



HEI 9
AB: 178; 205x: B flashes with averted vision, pretty close to white A, ~3"
03h 51m 21.55s +25° 38' 07.4" P.A. 282.00 sep 4.3 mag 9.30,10.40 Sp G5

BU 85 AB: 178; 205x: Very faint B can be seen direct, ~4".  Discovered with 6-inch.  Not physical.
03h 55m 26.06s +17° 37' 57.6" P.A. 217.00 sep 4.0 mag 7.95,9.95 Sp G5 dist. 197.63 pc (644.67 l.y.)

MLB 639 AB: 178; 205x: B barely seen direct, flashes with averted vision.  Very light orange A.  Not physical.
04h 00m 05.00s +27° 33' 18.3" P.A. 267.00 sep 8.1 mag 8.14,9.70 Sp K5

STF 479 AB: 178; 205x: White stars, ~1 delta, wide.
04h 00m 56.81s +23° 12' 05.4" P.A. 126.00 sep 7.5 mag 6.92,7.76 Sp B9V dist. 328.95 pc (1073.03 l.y.)

STF 481 AB: 178; 205x: B is faint but easily seen and steady, white A, ~3 delta mag, wide
04h 02m 14.87s +28° 07' 35.0" P.A. 106.00 sep 2.7 mag 7.52,9.60 Sp G8II

STF 495 AB: 178; 205x: White A, ~3 delta mag B, ~3".   OCC9088 Aa-Ab is 6.20/7.80 1.6", not seen.  
04h 07m 41.98s +15° 09' 46.1" P.A. 224.00 sep 3.8 mag 6.11,8.77 Sp F3V dist. 43.63 pc (142.32 l.y.)

STT 72 AB: 178; 205x: Very light orange A, and very faint B, need foveal coaxing to hold it direct, ~4"
04h 07m 59.42s +17° 20' 23.6" P.A. 328.00 sep 4.7 mag 6.10,9.71 Sp K5IIIb dist. 123.15 pc (401.72 l.y.)

BU 309 AB: 178; 205x: White star A and very much fainter B, seen direct barely, ~4"
04h 08m 20.64s +19° 44' 15.5" P.A. 280.00 sep 5.7 mag 7.77,11.03 Sp A2 dist. 326.8 pc (1066.02 l.y.)

STF 494 AB: 178; 205x: Near equal white stars, well separated
04h 08m 53.50s +23° 05' 55.1" P.A. 188.00 sep 5.2 mag 7.53,7.65 Sp A8IV+A8IV dist. 104.71 pc (341.56 l.y.)

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