(IAAC) Obj: Abell 21 (Medusa Nebula) - Inst: 13.1" Dobsonian
Observer: Dave Aucoin
Your skills: Advanced (many years)
Date/time of observation: 10:00PM EST
Location of site: Westford, MA (Lat , Elev )
Site classification: Exurban
Sky darkness: 5.0 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 13.1" Dobsonian
Magnification: 79 X
Object(s): Abell 21 (Medusa Nebula)
Category: Planetary nebula.
Data: mag 10.2 SB 16.3 size 744 X 509"
Position: RA 7h:29m DEC +13 :15
Best viewed with 19mm Konig and UHC. Very large, but could
only see N and S portions of the Nebula. The fainter wisps
of dust and gas could not be seen, due to seeing conditions.
Could not see the horse shoe appearance. Scope jiggling
helped find the object and averted vision is required.
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