(IAAC) Obj: M75 (NGC 6864) - Inst: 17" f/15 equatorial classical Cassegrain


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 06/19/98 05:55 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, 259x, 381x
Filter(s): None
Object(s): M75 (NGC 6864)
Category: Globular cluster.
Class: 1
Constellation: Sagittarius
Data: mag 8.6  size 6.0'
Position: RA 20:06.1  DEC -21:55

M75 is a relatively small but highly concentrated globular cluster in eastern
Sagittarius.  It is actually the most concentrated and distant 
(78,000 light years) of the Messier globulars and has a diameter of about 88 
light years.

At 144x M75 was small, circular, and unresolved.  When I observed M75 at 259x it
was only partially resolved and a brighter central condensation was noticeable.
M75 appeared almost stellar at 37x through the 5" f/5 finder scope.
Optional related URLs: http://www.msd.org/obs.htm
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