(IAAC) Obj: PNG 189.8+7.7, M 1-7 - Inst: 15 inch Obsession f4,5

[anonymous at sedna.atmob.org]

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Observation Poster: Armin Hermann <burmeseinn at yahoo.com>

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 10 Nov 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Exurban
Sky darkness: 5,4 <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): PNG 189.8+7.7, M 1-7
Category: Planetary nebula.
Class: 
Constellation: Gem
Data: mag 13 magv  size 37" (?)
Position: RA :  DEC :
Description:
At 342x this planetary looks slightly elongated. I estimated the size to approx 
10x15” which is much smaller than the given size in Uranometria. I saw a round 
central part that is brightening towards the middle. This fairly bright center is surrounded by a faint elongated (NW-SE) halo that seems to fade away. Bluish
 color is obvious at 131x but the color is no more visible at 342x. At 131x the 
nebula looks just non-stellar. 

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