(IAAC) Obj: M21 (NGC 6531) - Inst: 12.5" f/6.5 Cave equatorial Newtonian
Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 6/18/98 05:25 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA http://www.msd.org/obs.htm (Lat 40.1d N, 76.9d W, Elev 270')
Site classification: Exurban
Sky darkness: ~5.0 <Limiting magnitude>
Seeing: 8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 12.5" f/6.5 Cave equatorial Newtonian
Object(s): M21 (NGC 6531)
Category: Open cluster.
Class: I 3 m
Data: mag 5.9 size 13'
Position: RA 18:05 DEC -22:30
M21 can be found less than 1 degree northeast of M20. Approximately 60
stars of widely varying brightness comprise this bright open cluster.
At the eyepiece M21 was a somewhat compact group of about 20
moderately bright to bright stars. There were 2 diverging rows of
stars and an arc of stars to the north.
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