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(IAAC) Obj: Abell 18 - Inst: 18" f/4.5 dobsonian
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Observation Poster: John Tatarchuk <tatarjj@auburn.edu>
Observer: John Tatarchuk
Your skills: Advanced (many years)
Date/time of observation: 11/24/06
Location of site: Conecuh National Forest, South Alabama (Lat , Elev )
Site classification: Rural
Sky darkness: 6.7+ (Gegenschein visible) <Limiting magnitude>
Seeing: N/A <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 18" f/4.5 dobsonian
Magnification: 110X, 230X
Filter(s): OIII
Object(s): Abell 18
Category: Planetary nebula.
Class:
Constellation: Monoceros
Data: mag 17.5p size 71"x66"
Position: RA 6:56.2 DEC -02:53
Description:
I'd searched for this object several times previously. Under the dark skies of
Conecuh National Forest, I was at last successful in eeking out its faint glow.
Almost immediately after matching the field of view with the Aladin Previewer
finder chart, I was able to pick out an incredibly weak glow at 110X (19mm
Panoptic) with OIII filtration right at the correct position. I was unable to
hold the nebula in adverted vision for more than a moment or two, but I was
able to reacquire rather easily. Increasing the magnification to 230X (9mm
Nagler) seemed to slightly diminish the visibility of the object. Perhaps a
slight elongation was detected to the nebula, but for the most part the nebula
seemed to have no clearly defined form.
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