(IAAC) Obj: M9 (NGC 6333) - Inst: 12.5" f/6.5 Cave equatorial Newtonian


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 06/18/98 04:30 UT
Location of site: ASH Naylor Observatory (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: 46, 83, and 159x
Filter(s): None
Object(s): M9 (NGC 6333)
Category: Globular cluster.
Class: class 8
Constellation: Ophiuchus
Data: mag 7.9  size 9.3'
Position: RA 17:19  DEC -18:31
Tonight I began to observe some of those Messier objects that Lew Gramer
requested additional observations on and M9, a rather compact globular cluster
in southern Ophiuchus, was the first.  M9 is some 9.1 kiloparsecs distant and
has a diameter of about 49 light years.  It is the smallest of the many Messier
globulars in Ophiuchus and is situated approximately 1 degree to the east of a
line connecting Eta and Xi.  M9 was easily visible in the Lumicon 11x80 finder
scope.  It was unresolved at 46x (45mm University Optics Ploessl).  At 83x (25mm
U.O. MK-70) there was partial resolution of the cluster's outermost stars.  The
cluster was somewhat resolved at 159x (13mm Tele Vue Ploessl) and had an almost
triangular appearance at this magnification.
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