(IAAC) Obj: NGC 6644 - Inst: 15" f4.5 Obsession

[anonymous at s15272250.onlinehome-server.com]

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

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 27 Jun 2008
Location of site: 5 km N of Kanchanaburi, Thailand (Lat 14 N, Elev 50m)
Site classification: Exurban
Sky darkness: 5.5 <Limiting magnitude>
Seeing: 9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15" f4.5 Obsession
Magnification: 131x, 342x
Filter(s): OIII
Object(s): NGC 6644
Category: Planetary nebula.
Class: 
Constellation: Sgr
Data: mag 10.7  size 12"
Position: RA 18:33  DEC -25:
Description:
Tiny round and blueish disk at 131x. Almost stellar at that magnification. At 
342x the disk displays a brighter center and an edge that is fading away. It 
appears a bit bigger when observed through averted vision. NGC6644 responds 
very strongly to the use of the OIII filter. Diameter not more than 6-7".

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