(IAAC) Obj: IC 1747 - 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: 12 Nov 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Rural
Sky darkness: 5,8 <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): OIII at 342x
Object(s): IC 1747
Category: Planetary nebula.
Class: 
Constellation: Cas
Data: mag 12,1magv  size 13"
Position: RA :  DEC :
Description:
Bright tiny and round disk. At 131x just non-stellar showing blueish color. The
 color is still obvious at 342x. Using the OIII filter the nebula shows a 
slightly brighter, mottled edge and darkens towards the center (annular shape).
 Without OIII filter I could glimpse the 15,8mag central star in moments of 
perfect seeing! That was quite a surprise given my aperture of 15".

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