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(IAAC) Obj: NGC 6309 - Inst: 15" f4,5 Obsession



Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 11 Apr 2005
Location of site: Sangkhlaburi, Thailand (Lat 15.09 N, Elev 200)
Site classification: Exurban
Sky darkness: 5,8 <Limiting magnitude>
Seeing: 10 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15" f4,5 Obsession
Magnification: 342x
Filter(s): O III
Object(s): NGC 6309
Category: Planetary nebula.
Class: 
Constellation: Oph
Data: mag 11,5  size 15x20"
Position: RA :  DEC :
Description:
At 342x this planetary appears rectangular in shape (size approx 15x20"). The disk 
is split into 2 lobes of which the northern lobe is the more distinct one. The center 
of the disk appears darker and interestingly I did not see the central star. An 
11mag star is located just 20" N of the nebula and another very faint star 
(<14mag) pops into view at the W edge of 6309. That star almost touches the 
nebula. NGC 6309 did not respond well to the OIII filter. The nebula did appear 
brighter but detail seemed to disappear.
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