Thursday, September 23, 2021

catching up

I had a couple nights this week when I observed with the 20-inch.  Seeing was poor each night so most of the time was spent masked to 7-inches.  For certain the refractor gives the best star images, but when seeing cooperates the reflector can really push the limits.  So I have the best of both worlds.  I've become a bit of a conditions snob: if seeing is predicted to be merely average I use the refractor, and will only open the 20-inch if the seeing is predicted to be above average or excellent.

BU 139 AB: 178; 445x: Snowman only even at best moments of seeing, around 2 delta mag.  Physical with a 587-year period now coming off apastron.  
19h 12m 34.45s +16° 50' 47.2" P.A. 135.80 sep 0.6 mag 7.11,7.95 Sp B9IV dist. 242.72 pc (791.75 l.y.)

STF2437 AB: 178; 333x: Light orange, snowman only.  Physical with a 804.6-year period, 
19h 01m 53.16s +19° 10' 11.7" P.A. 1.50 sep 0.6 mag 8.41,8.83 Sp G5 dist. 84.39 pc (275.28 l.y.)

STF2460 AB: 178; 205x: Faint, wide, about 1 delta mag.  Physical
19h 07m 59.39s +19° 45' 19.7" P.A. 198.00 sep 9.5 mag 10.02,10.25 Sp A0

STF2475 AB: 178; 205x: B is faint, can just hold direct vision brightens with averted vision, 2 delta mag and wide.  WDS uncertain.
19h 10m 25.71s +17° 44' 09.5" P.A. 321.00 sep 6.8 mag 9.19,11.30 Sp F0+G5

A 151 AB: 178; 205x: Very subtle notched elongation, white stars, seeing not supporting higher powers.  WDS uncertain, 
19h 11m 22.81s +21° 15' 39.2" P.A. 158.00 sep 0.6 mag 8.55,9.56 Sp B9.5V dist. 775.19 pc (2528.67 l.y.)

STF2484 AB: 178; 205x: Cream white A and yellow B, 2" separation, 2 delta mag, very pretty.  Physical with a 1500-year period.
19h 14m 15.66s +19° 03' 50.3" P.A. 240.90 sep 2.1 mag 7.93,9.51 Sp F8 dist. 67.2 pc (219.21 l.y.)
STF2488 AB: 178; 205x: Faint pair, quite closely separated, 1 delta mag, very nice.  WDS uncertain
19h 15m 28.07s +20° 01' 53.2" P.A. 352.00 sep 1.8 mag 9.08,9.99 Sp G5

STF2552 AB: 178; 205x: 1 delta mag, well separated white stars.  WDS says physical.
19h 37m 55.00s +19° 21' 32.2" P.A. 195.00 sep 5.3 mag 8.49,9.11 Sp A2 dist. 740.74 pc (2416.29 l.y.)

HU 342 AB: 178; 205x: 1 delta mag, well separated white stars fairly faint.  WDS says physical.
19h 37m 07.56s +17° 23' 11.0" P.A. 256.00 sep 4.6 mag 9.83,10.36 Sp F8

STF2563 AB: 178; 205x: White, 1 delta mag, well separated.  WDS says physical.
19h 42m 28.87s +17° 25' 38.9" P.A. 286.00 sep 6.0 mag 8.66,9.52 Sp G0

STF2500 A-BC; 178; 205x: White A and very faint wide B, not physical.  Not seen, BC is COU 421, 0.4" 11.50/11.50.  
19h 19m 26.19s +19° 43' 06.1" P.A. 23.00 sep 20.0 mag 8.21,10.74 Sp A0 dist. 200.4 pc (653.7 l.y.)

STF2482 AB: 178; 205x: B is very faint and flashes with averted vision, and I can barely hold it direct, very closely split.  WDS uncertain.
19h 13m 02.20s +19° 08' 20.6" P.A. 341.00 sep 1.8 mag 9.03,10.20 Sp F0V dist. 186.22 pc (607.45 l.y.)

HO 573 AB: 178; 205x: Fairly wide, white A and faint B which brightens with averted vision.  WDS uncertain.
19h 13m 17.36s +19° 33' 47.7" P.A. 127.00 sep 7.7 mag 9.75,10.20 Sp A5

HU 345 AB: 178; 205x: Light yellow-orange stars, 1 delta mag, well split, nice!  WDS says physical.
19h 46m 45.89s +17° 33' 09.0" P.A. 104.00 sep 3.8 mag 8.98,9.98 Sp K

ENG 66 AB: 178; 205x: Light yellow A and super-wide B.  This pair must have been suggested by proper motion data.  WDS says not physical
19h 07m 57.32s +16° 51' 12.1" P.A. 288.00 sep 132.3 mag 6.15,10.78 Sp G5V dist. 21.43 pc (69.9 l.y.)

BLL 37 AB: 178; 205x: Light orange and faint super-wide B.  Not physical.
19h 15m 33.36s +18° 30' 58.9" P.A. 165.00 sep 139.4 mag 6.67,12.44 Sp M2III dist. 257.73 pc (840.72 l.y.)

AG 432 AB: 178; 205x: White and super wide B.  WDS uncertain.  
19h 18m 48.41s +19° 36' 37.7" P.A. 318.00 sep 92.8 mag 6.50,9.68 Sp B9V dist. 239.81 pc (782.26 l.y.)

HO 105 AB: 178; 205x: Excellent pair at this aperture, close split and 3 delta mag, just steady and bright enough to see despite haze and full moon.  WDS says not physical.
19h 22m 12.87s +16° 39' 45.0" P.A. 189.00 sep 2.8 mag 8.91,9.94 Sp B9 dist. 854.7 pc (2788.03 l.y.)

H N 84 AB: 178; 205x: Very pretty orange A and neon blue B, 1 delta mag, very wide
19h 39m 25.33s +16° 34' 16.0" P.A. 301.00 sep 28.4 mag 6.38,9.46 Sp K4Ib dist. 1265.82 pc (4129.1 l.y.)

HO 112 AB: 178; 205x: Very faint, almost ghostly, near equal, split, really nice.  Not physical.
19h 41m 29.50s +18° 38' 03.2" P.A. 259.00 sep 2.8 mag 10.17,10.22 Sp F2

OL 72 AB: 178; 205x: Faint, well split, slight magnitude difference.  Not physical.
19h 46m 42.32s +18° 38' 49.7" P.A. 9.00 sep 7.1 mag 10.50,10.60

STT 396 AB: 178; 205x: Light orange and super-wide B.  Not physical.
20h 03m 16.40s +18° 30' 03.6" P.A. 208.00 sep 46.6 mag 6.13,10.38 Sp K3II-III dist. 248.14 pc (809.43 l.y.) 

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