24 september 2020

Seeing was pretty rough last night, windy both at ground level and higher up.  I used the 8-inch mask throughout the session.  I did some investigative observations of BU 677 for a thread on Cloudy Nights.  I remained pointed nearly overhead to get the best seeing.  There are many 10th and 11th magnitude pairs in this part of the sky, but with only 8-inch I didn't try them.  The marine haze thickened as the night drew on, so I closed up at 10:30pm.  Tonight will have better seeing but with the moon the sky will be bright -- so I plan an shallow sky session, especially since Mars is big and bright now.

BU 677 AC: 508; 333x: T Cyg.  No trouble to see both AB and AC.  A is a pretty orange star, with two much fainter blue stars well separated at 333x, forming a near right triangle.  B is one delta brighter than C, and C is separated from A at approximately twice the distance B is.   Burnham discovered AB with the 18.5-inch, and the AC with the 36-inch. 

20H 47M 10.72S +34° 22' 26.8" P.A. 211 SEP 16.8 MAG 4.94,11.20 SP K3III DIST. 136.43 PC (445.03 L.Y.)

BU 677 AC: 203; 333x: Tight disks in poor seeing.  B is seen easily, but C was barely direct vision.

BU 677 AB: 152; 175x: Could not detect B or C in average seeing and transparency.  Suburban location with some haze in the sky and a quarter moon.

BU 694 AB: 203; 333x: V1942 Cyg.  Split with seeing, very much fainter B at the rim of A's diffraction, blue-white stars.  Burnham discovered in 1878 at 0.5" with the Dearborn 18.5-inch 

22H 02M 56.68S +44° 38' 59.8" P.A. 6 SEP 1 MAG 5.71,7.76 SP A0IV DIST. 151.06 PC (492.76 L.Y.)

AC 20 AB: 203; 205x: 75 Cyg.  I detect a brightening knot on the outside of A's diffraction.  Seeing does not resolve it to a point.  Both stars are orange.  Alvin Clark discovered in 1860 at 2.9" -- don't know what aperture.

21H 40M 11.11S +43° 16' 25.8" P.A. 327 SEP 2.7 MAG 5.28,10.10 SP M2III DIST. 123.76 PC (403.71 L.Y.)

BU 274 AB: 203; 205x: Delicate pair, white A and ~3 delta mag B, well separated ~4".  Very pretty, but not physical.
21H 41M 18.85S +39° 28' 26.4" P.A. 181 SEP 3.7 MAG 8.24,9.94 SP K0 DIST. 224.72 PC (733.04 L.Y.)

HU 693 AB: 203; 333x: Very tight split with seeing, faint pair with considerable magnitude difference (not near equal as in SkyTools) 
21H 43M 53.99S +50° 33' 43.9" P.A. 232 SEP 1.1 MAG 9.23,9.96 SP F8

ARG 43 AB: 203; 205x: Wide, pretty pair, ~1 delta mag, very light yellow A and very light blue B 
21H 44M 45.10S +49° 30' 46.4" P.A. 20 SEP 29.2 MAG 8.63,9.01 SP A0 DIST. 355.87 PC (1160.85 L.Y.)

STF 2832 AB: 203; 205x: White, wide, slight magnitude difference.  Physical.
21H 49M 14.48S +50° 30' 54.2" P.A. 212 SEP 13.1 MAG 7.77,8.32 SP B9IV DIST. 152.44 PC (497.26 L.Y.)

STT 456 AB: 203; 205x: Very nice tight pair, very close split, ~1 delta mag. white stars.  Physical.
21H 55M 31.59S +52° 31' 40.7" P.A. 37 SEP 1.6 MAG 8.25,8.93 SP F2V DIST. 252.53 PC (823.75 L.Y.)

HO 175 AB: 203; 333x: Notched elongation at 333x & 533x.  Seeing not good enough to resolve. 
22H 00M 55.66S +43° 38' 06.6" P.A. 323 SEP 0.8 MAG 7.86,9.55 SP A5 DIST. 166.67 PC (543.68 L.Y.)

ES 530 AB: 203; 205x: B seen with averted vision only, can't quite hold it direct.  Bright white A, widely separated ~8".  Lampens (1998) LMP 46 AC not seen, 8.08/13.45 24.6" -- though this is not physical.   
22H 03M 25.12S +48° 41' 02.9" P.A. 190 SEP 8.5 MAG 8.08,11.24 SP A0 DIST. 598.8 PC (1953.29 L.Y.)

BU 375 AB: 203; 333x: With seeing I get the barest of splits, >2 delta mag, very small scale and tight.  
22H 09M 05.98S +50° 46' 32.8" P.A. 301 SEP 1 MAG 8.95,10.44 SP A0 DIST. 2127.66 PC (6940.43 L.Y.)

STT 465 AB: 203; 205x: Easy brilliant white and fainter stars.  Not physical

22H 11M 57.53S +50° 11' 46.2" P.A. 315 SEP 12.7 MAG 7.30,10.55 SP F0II DIST. 649.35 PC (2118.18 L.Y.)

BU 991 AB: 203; 533x: Hairline split with seeing, near equal. 

22H 13M 35.37S +52° 33' 50.8" P.A. 136 SEP 0.7 MAG 9.21,9.05 SP B9

ES 1113 AB: 203; 205x: Part of an equilateral triangle of similar magnitude stars, this is a ~2 delta mag pair, pretty wide ~6".  Physical

22H 15M 24.49S +51° 03' 32.3" P.A. 221 SEP 7.1 MAG 9.80,10.95 SP A2