(IAAC) Obj: Abell 20 - Inst: 13" f/5.6 Newtonian on Bigfoot German EQ

Observer: Steve Coe
Your skills: Advanced (many years)
Date/time of observation: 12 Feb 1999
Location of site: Salome, Arizona USA (Lat +34, Elev 3000 ft)
Site classification: Rural
Sky darkness: 8 <1-10 Scale (10 best)>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument:  13"  f/5.6 Newtonian on Bigfoot German EQ 
Magnification: 100X, 220X
Filter(s): UHC
Object(s): Abell 20
Category: Planetary nebula.
Constellation: CMI
Data: mag 14.2  size 67 arcsec
Position: RA 07:23  DEC +01:46
At 100X this planetary was extremely faint, pretty small, round and not brighter
in the middle.  There are two very faint stars involved on the north side.
The UHC helps the contrast some, but there are not many photons to filter.
This is an extremely low surface brightness object, averted vision does
help, but it is still a toughie, even on an excellent dark night.  
Raising the power to 150x was no help at all.
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