(IAAC) Obj: NGC 6638 - Inst: 15 inch Obsession f4,5

Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 03 Oct 2004
Location of site: Sangkhlaburi, Thailand (Lat 15N, Elev 200m)
Site classification: Exurban
Sky darkness: ~5 <Limiting magnitude>
Seeing: 7-8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 131 and 342x
Filter(s): none
Object(s): NGC 6638
Category: Globular cluster.
Constellation: Sgr
Data: mag 9,1magv  size 7'
Position: RA :  DEC :
At 131x the cluster shows no single stars but a bright small core. 342x 
resolves some 20 stars down into the center. The core appears very condensed. 
It has a diameter of ~1,5' and the overall diameter of 6638 is about 5. 
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