(IAAC) Obj: Abell 4 (PK 144-15.1) - Inst: 24" f/4.1 Dobson


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

Observer: Stathis Kafalis
Your skills: Advanced (many years)
Date/time of observation: 2001 Aug 22
Location of site: German Alps  (Lat 48, Elev 1300 m)
Site classification: Exurban
Sky darkness: 3 <Bortle Scale (9 worst)>
Seeing: 6 <10-1 Seeing Scale (1 best)>
Moon presence: None - moon not in sky
Instrument: 24" f/4.1 Dobson
Magnification: 280
Filter(s): UHC and OIII
Object(s): Abell 4 = PK 144-15.1
Category: Planetary nebula.
Class: Irregular disk w. traces of ring structure
Constellation: Perseus
Data: mag 14.4 (vis)  size 22"
Position: RA 02:54  DEC +42:33
At 79x (32 mm WF) position found, but planetary not immediately recognized. 
At 280x (9 mm Nagler) pretty bright seen as an exactly round homogenous disk of approx. 1/2' diameter. The edge is well defined. UHC- filter brings more contrast,but not more detail.
OIII brings barely more contrast than UHC. No internal irregularities visible.

Directly 1/2' NW of planetary is the galaxy CGCG 539-091 (15p6). Not easy but surely seen with averted vision as an 3:1 elongated lens in NW-SO. Nice view next to the planetary

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