(IAAC) Obj: M57 (NGC 6720) - Inst: 8" f/6 Dobsonian

Observer: Michael Geldorp
Your skills: Intermediate (some years)
Date/time of observation: 8/22/2000  21.30 UT
Location of site: Alphen ad Rijn, Netherlands (Lat 52*N, Elev )
Site classification: Suburban
Sky darkness: 4.5 <Limiting magnitude>
Seeing: II <I-V Seeing Scale (I best)>
Moon presence: None - moon not in sky
Instrument: 8"  f/6 Dobsonian
Magnification: 49X, 98X, 203X, 244X
Filter(s): OIII
Object(s): M57 (NGC 6720)
Category: Planetary nebula.
Constellation: Lyr
Data: mag 8.8  size 70" x 150"
Position: RA 18:54  DEC +33:02
Seen at 49X and 98X both with and without an OIII filter although the filter
made it a much brighter nebula. Superb object at 203X with the OIII filter in
Donut shaped nebula elongated about E-W. The ring structure is not the same
thickness in all places and there are areas along the N and S rim which show
brighter knots with the OIII. The central hole was much brighter with the filter
whereas it is almost dark without it.
The central star is much too faint to be seen with my 8".
There is a sketch on this object on my homepage: URL mentioned below.
Optional related URLs: http://home.wxs.nl/~geldo006/home.html
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