(IAAC) Obj: Abell 21 (Medusa Nebula) - Inst: 10" f/6 equatorial Newt


Observer: Susan C. French
Your skills: Advanced (many years)
Date/time of observation: 3-24-00, 9:45pmEST
Location of site: West Glenville, NY (Lat 43, Elev 995 ft)
Site classification: Exurban
Sky darkness: Transparency: fair <Limiting magnitude>
Seeing: poor <Photographic (Airy disk sec)>
Moon presence: None - moon not in sky
Instrument: 10" f/6 equatorial Newt
Magnification: 118x
Filter(s): OIII
Object(s): Abell 21 (Medusa Nebula)
Category: Planetary nebula.
Constellation: Gem
Data: mag   size 
Position: RA 07:29  DEC 13:15
Large planetary nebula ~ 10' across.  The shape is tough to tell under
these sky conditions, but it looks something like a fat arc.  The OIII
filter makes this planetary rather easy to spot.  It is not uniform in
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