(IAAC) Obj: NGC 6939 - Inst: TV-102 (102mm f/8.6 APO refractor)


Observation Poster: Ron B[ee] <ronby@home.com>

Observer: Ron B[ee]
Your skills: Beginner (< one year)
Date/time of observation: 10/21/01
Location of site: 117h 9m W (Lat 32h 43m N, Elev 2000 ft)
Site classification: Exurban
Sky darkness: 5 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: TV-102 (102mm f/8.6 APO refractor)
Magnification: 22x, 60x, 110x, 146x
Filter(s): none
Object(s): NGC 6939
Category: Open cluster.
Constellation: Cep
Data: mag 7.8  size 8'
Position: RA :  DEC :
My dimmest OC yet, much dimmer than its listed 7.8 magnitude.  This OC is a 
very faint smudge at 22x, much dimmer than its mag 7.8 would suggest.  Looked 
more like OC at 30x and more definite at 60x.  Better view at 110x, now can see 
4 (10th magnitude) stars enclosing the OC: SAO 18910, GSC 4233:1282, GSC 
4233:1918 and GSC 4233:2480.  Best view at 146x with V shape impression, about 
10 stars now seen with direct vision.  The 4 enclosing stars still fit within 
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