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


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
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.
Optional related URLs: http://www.geocities.com/dobsonstathis
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