(IAAC) Obj: Struve 2472/2473 - Inst: 17" f/15 classical Cassegrain


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 01:40 6/1/98 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA (Lat 40d08'54" N, 76d53'04" W, Elev 285m)
Site classification: Exurban
Sky darkness: 6 <1-10 Scale (10 best)>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 17" f/15 classical Cassegrain
Magnification: 202x
Filter(s): none
Object(s): Struve 2472/2473
Category: Multiple star.
Constellation: Lyra
Data: mag   size 
Position: RA 19h:08m  DEC 37d:55'
Armed with some recently acquired data from Brian Skiff I was readily able to
observe the third of Lyra's "double doubles", Struve 2472/2473, also known as
ADS 12090AB/CD.  AB is the southern pair consisting of 8.3 and 10.8 magnitude
stars.  CD's two stars are evenly matched at 10.1 and 10.2 magnitude and are
oriented roughly east-west. Separation between A and B is about 22"; between C
and D about 6". The two pairs are about 85" apart.  Of the three double pairs
in this constellation I feel that Struve 2470/2474 is the most attractive.
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