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(IAAC) Obj: NGC 6781 - Inst: 15 inch Obsession f4,5
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To: Internet Amateur Astronomers Catalog <netastrocatalog@visualdeepsky.org>
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Subject: (IAAC) Obj: NGC 6781 - Inst: 15 inch Obsession f4,5
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From: anonymous@sedna.atmob.org
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Date: 17 Aug 2004 15:03:25 -0000
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Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 16 Aug 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Exurban
Sky darkness: better 5mag <Limiting magnitude>
Seeing: 9+ <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 131 and 342x
Filter(s): none
Object(s): NGC 6781
Category: Planetary nebula.
Class:
Constellation: Aql
Data: mag 11,4v size 110"
Position: RA : DEC :
Description:
NGC6781 is fairly bright and appears as a uniform round disk (approx 2'
diameter) at 131x. It reminded me immediately of M97. At 342x the nebula
appears annular with averted vision. The SW edge is brighter than the opposite
side. The planetary darkens a little bit towards the center. There I could not
see any sign of a central star. I did see a faint star at the NE edge of the
nebula. Difficult object under less than perfect observing conditions.
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