Monday, October 12, 2020

11 october 2020

Last night was good, if somewhat disappointing of a session.  Transparency was very good, such a difference with past weeks with many more stars visible in the sky, making for good binocular scanning.  Seeing, on the other hand, was middling, about 5-6/10, so I kept magnifications rather low and the apodising mask on the 20-inch the whole time.  I felt tired (went to Agate beach during the day) so I did not stay out past 11pm, though the seeing was forecasted to improve.  Fairly heavy dew, as is normal this time of year.  Ended the night with a view of Mars.

SHJ 1721 AB: 508; 205x: OX Peg. A surprisingly pretty pair, light orange A and light blue B, ~2 delta mag, wide.  The A star is spectral class M (red).  There's a fine near equal double in the same field, J 1225.
22H 05M 44.53S +29° 54' 23.3" P.A. 265 SEP 12.8 MAG 7.94,9.41 SP M DIST. 900.9 PC (2938.74 L.Y.)

J 1225 AB: 508; 205x: Fine near equal faint stars, about 11th magnitude, ~3" separated.  In same field as SHJ 1721.  
22H 05M 55.42S +29° 51' 16.9" P.A. 115 SEP 3.2 MAG 11.51,11.39

COU 435 AB: 508; 333x: Quite difficult, when A settles, B appears as a very fine point just outside A's first diffraction, noticed with averted vision. 
22H 06M 20.04S +26° 56' 13.2" P.A. 12 SEP 1.5 MAG 8.65,11.50 SP F5

MLB 579 AB: 508; 205x: B is considerably fainter than A and was noticed with averted vision, and could the hold direct with foveal coaxing.  Faint, wide, and not physical
22H 07M 02.79S +27° 35' 32.6" P.A. 21 SEP 8.3 MAG 11.12,13.00

HO 641 AB: 508; 205x: Easy wide ~10" and ~3 delta mag, why suspect double? 
22H 10M 07.38S +32° 20' 34.0" P.A. 174 SEP 9.9 MAG 8.11,12.30 SP K0

AG 280 AB: 508; 205x: A is a very light yellow color and B a light blue, wide, half delta mag.  Pretty, subtle colors.  Physical
22H 10M 24.99S +31° 40' 30.0" P.A. 180 SEP 11.2 MAG 9.81,10.30 SP G5

HO 178 AB: 508; 205x: ! Wow this is a good one.  A is a blazing white and just beyond its glow is a very faint point of the B star, such a contrast in the magnitudes.  ~4" and ~4 delta mag. 
22H 11M 28.36S +32° 05' 09.9" P.A. 223 SEP 3.4 MAG 7.40,11.16 SP F0 DIST. 121.8 PC (397.31 L.Y.)

HO 289 BC: 508; 333x: BC seen with 205x, but much easier view with 333x.  They are a tight blue, faint pair, well separated from bright light orange A, PA is in a line away from the a star.  Surprisingly it is not physical.
22H 11M 33.83S +27° 16' 28.1" P.A. 324 SEP 3.1 MAG 11.80,12.10

A 1228 AB: 508; 205x: ~2 delta mag well separated pair ~4", in a triangle of similar magnitude stars
22H 11M 39.47S +31° 48' 44.1" P.A. 350 SEP 3.8 MAG 9.60,11.40 SP G5

HO 179 AB: 508; 333x: Yellow-white stars, ~1 delta mag, well split <1" 
22H 12M 37.85S +30° 12' 34.3" P.A. 282 SEP 1 MAG 8.64,9.41 SP F5

ES 388 AB: 508; 205x: Easy wide ~1 delta mag white stars.  Not physical 
22H 13M 16.57S +32° 08' 25.8" P.A. 263 SEP 7.9 MAG 10.05,10.60

TDT3410 AB: 508; 205x: Very interesting, near a bright tar and I saw it plainly at low power 205x, but wanted higher power confirmation.  At 333x it kind of disappeared but with 533x it is back, more than 1 delta mag, very faint, <1".  There is a brighter star nearby which distracts and maybe is why not discovered before.  [This one is also a fast mover, 0.7" at 1991 discovery and 0.4" at 2009 measure -- I wonder if there's a difference in measurement methodologies which causes the difference?]
22H 13M 26.46S +31° 23' 10.5" P.A. 200 SEP 0.4 MAG 10.24,11.04

BU 476 AB: 508; 205x: Easy white stars, slight magnitude difference, well separated [Burnham discovered in 1877 with his 6-inch, and noted BU 477 is in the same low power field -- I did not notice it, maybe not using low enough power.]
22H 14M 06.05S +31° 24' 06.1" P.A. 93 SEP 2.8 MAG 9.50,9.82 SP A2

STF2881 AB: 508; 205x: Close white stars, ~1 delta mag, >1", nice
22H 14M 34.67S +29° 34' 20.6" P.A. 76 SEP 1.3 MAG 7.65,8.24 SP F6III DIST. 171.53 PC (559.53 L.Y.)

BU 477 AB: 508; 205x: Easy wide pair, ~1 delta mag.  Physical. [Discovered in 1877 with his 6-inch, in the same low power field as BU 476.]
22H 15M 54.66S +31° 25' 09.1" P.A. 41 SEP 6.6 MAG 9.50,10.34 SP F5

STF 2889 AB: 508; 205x: Very fine pair, light yellow stars, ~2" separation ~2 delta mag.
22H 16M 19.71S +26° 16' 15.8" P.A. 198 SEP 2.3 MAG 8.49,10.15 SP K0III DIST. 377.36 PC (1230.95 L.Y.)

BU 1216 AB: 508; 333x: White stars, nicely split, noticeable delta mag.  Physical with 503 year period.  Discovered in 1890 with the 16-inch of the Warner Observatory at 0.6"
22H 20M 12.75S +29° 31' 07.8" P.A. 276.7 SEP 0.89 MAG 8.61,9.21 SP F5 DIST. 113.25 PC (369.42 L.Y.)

HO 615 BC: 508; 533x: BC suspected at 205x, seen with 333x, seen best with 533x. Very faint star compared with brilliant white A, there are several faint stars surrounding A like debris from an explosion.  BC is a close pair ~3", ~1 delta mag, and forms an arc with a third faint star.
22H 21M 23.56S +28° 19' 05.4" P.A. 17 SEP 3.1 MAG 10.73,12.40 SP F2V

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