(IAAC) Obj: M22 (NGC 6656) - 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 570')
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
Magnification: 121x, 159x
Filter(s): None
Object(s): M22 (NGC 6656)
Category: Globular cluster.
Class: 7
Constellation: Sagittarius
Data: mag 5.1  size 24.0
Position: RA 18:36.4  DEC -23:54
The largest and brightest globular cluster easily visible to mid-northern
latitudes is M22.  Unfortunately, its southerly position prevents it (unlike
the smaller and dimmer M13) from being truly appreciated.  This very rich and
well resolved globular is about 7800 light years distant and has a diameter of
approximately 110 light years.
M22 appeared as a circular mass of stars with a somewhat rectangular core.
Sprinkled throughout were a number of brighter stars.  A larger instrument
such as the ASH 17" f/15 classical Cassegrain produces a very impressive image
of this object at magnifications above 200x.
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