Friday, February 9, 2018

double stars around pleiades . M45

Big Blue, 553x most of the time. Seeing 6-7, Transparency 4/5. Viewed mostly around M45, tried to make a small project of viewing double stars around the Pleiades

STF 435: Wide orange and blue, 2 delta mag. Nice big orange finder split 1 degree to the north from here; one of which has a faint wide pair when viewed through the telescope.
03H 43M 06.52S +25° 40' 52.9" P.A. 3 SEP 13.5 MAG 7.20,8.87 SP F3V

STF 427
= V1268: Wide near equal orange in finder, loses color in the scope.
03H 40M 38.77S +28° 46' 24.0" P.A. 207 SEP 7 MAG 7.41,7.84 SP A1V+A2V DIST. 113.12 PC (369 L.Y.)

STF 401: Wide near equal. [SHY 445, 4 delta mag and 999” separation!?]
03H 31M 20.76S +27° 34' 18.5" P.A. 269 SEP 11.4 MAG 6.58,6.93 SP A2V DIST. 97.47 PC (317.95 L.Y.)

EI 7: Pretty finder split.

Tok 13: Orange-yellow with very wide 2x fainter B
03H 26M 35.36S +28° 42' 55.2" P.A. 129 SEP 96.4 MAG 6.59,10.00 SP G5IV-V DIST. 51.63 PC (168.42 L.Y.)

A 1830: Wide separation, 2 delta mag. [AC = GRV 195 3 delta mag super wide, likely what was seen. Aitken is 0.1” separation
03H 51M 20.24S +26° 21' 13.6" P.A. 166.9 SEP 0.12 MAG 8.02,8.00 SP F8

HU 813
: B not seen, too faint.
03H 40M 21.58S +21° 24' 20.6" P.A. 294 SEP 3.7 MAG 7.18,14.70 SP A5 DIST. 81.97 PC (267.39 L.Y.)

HJL 1024: Very wide faint companion, ~3 delta mag
03H 43M 41.53S +23° 38' 56.9" P.A. 175 SEP 196.8 MAG 7.96,9.61 SP A9V DIST. 131.93 PC (430.36 L.Y.)

HJL 1026: Two faint stars near two brighter stars. Pretty wide, 1 delta mag. View disrupted by the brighter stars, the finder not at enough scale to separate them. [Multiple system, seems the brighter stars are part of the system.]
03H 45M 54.47S +24° 33' 16.2" P.A. 130 SEP 149.6 MAG 5.75,6.42 SP B8V DIST. 114.03 PC (371.97 L.Y.)

BU 536: Large pair split in the finder. In scope it is a 2+1, but there are two fainter stars seen, one 5” from its star. Can not find a 0.9” pair which is supposed to be there. [6 stars in system, so it’s a little confusing…]
03H 46M 16.00S +24° 11' 23.5" P.A. 179 SEP 1.03 MAG 8.13,9.39 SP A7V

BU 537: Seeing too unsteady; suddenly it is very poor.
03H 47M 03.55S +24° 49' 11.7" P.A. 219 SEP 0.6 MAG 8.70,10.70 SP A9V

STF 450: Easy yellow-blue 5” 1.5 delta mag. [AB seen. AC = HL 21 and is 6.65 delta mag and very wide separation.]
03H 47M 24.41S +23° 54' 52.8" P.A. 261 SEP 6.2 MAG 7.29,9.40 SP A2V

STF 449: B comes to view with seeing and averted vision. Wide ~7”, 2 delta mag. [Not sure what I saw, my separation too close; 6 stars in system.]
04H 10M 04.99S +24° 06' 53.8" P.A. 281 SEP 31 MAG 10.36,11.12 SP G0 DIST. 166.67 PC (543.68 L.Y.)

STF 457
: Messy elongation but not split. [0.9”, should have been doable, if seeing was better.]
03H 50M 19.66S +22° 40' 41.6" P.A. 91 SEP 0.9 MAG 9.31,9.44 SP F5

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