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(IAAC) Obj: Abell 39 (PK 47+42.1) - Inst: 17.5" f/4.5 Dobson



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Observation Poster: Stathis Kafalis <dobsonstathis@planet-interkom.de>

Observer: Stathis Kafalis
Your skills: Advanced (many years)
Date/time of observation: 2000 May 10
Location of site: 50 km south of Munich/ Germany (Lat 48, Elev 700)
Site classification: Exurban
Sky darkness: 4 <Bortle Scale (9 worst)>
Seeing: 5 <10-1 Seeing Scale (1 best)>
Moon presence: None - moon not in sky
Instrument: 17.5" f/4.5 Dobson
Magnification: 83 and 132
Filter(s): OIII
Object(s): Abell 39 = PK 47+42.1
Category: Planetary nebula.
Class: Smooth disk w. traces of ring structure
Constellation: Hercules
Data: mag 13.0 (vis)  size 170"
Position: RA 16:28  DEC +27:54
Description:
Without filter nothing to see.
At 132x (15 mm Panoptic) with OIII obvious with averted vision.
Exactly round, big with slightly diffuse edge. 
Sometimes darker in the middle.
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Optional related URLs: http://www.geocities.com/dobsonstathis
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