(IAAC) Obj: M55 (NGC 6809) - Inst: 17" f/15 equatorial classical Cassegrain


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 06/19/98 05:40 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA (Lat 40.1d N, 76.9d W, Elev 570')
Site classification: Exurban
Sky darkness: <5.0 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 17" f/15 equatorial classical Cassegrain
Magnification: 144x, 202x, 259x
Filter(s): None
Object(s): M55 (NGC 6809)
Category: Globular cluster.
Class: 11
Constellation: Sagittarius
Data: mag 7.0  size 19.0'
Position: RA 19:40/.0  DEC -30:58
Located some 20,000 light years away, M55 is a very large and rich
globular cluster that is about 81 light years in diameter.  It is the
least concentrated of the Messier globulars.
M55's southerly location makes it a less imposing object in mid-northern
latitudes than it is from southern climes.  It was unresolved in the 5"
f/5 finder scope.  At 259x through the 17" M55 appeared as a large and
"loose" globular that was roughly circular in shape.
Optional related URLs: http://www.msd.org/obs.htm
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