(IAAC) Obj: PNG 232.4-1.8, M1-13, Minkowski 1-13 - Inst: 15 inch Obsession f4,5

Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 09 Feb 05
Location of site: Sangkhlaburi, Thailand (Lat 1509' N, Elev 200m)
Site classification: Exurban
Sky darkness: 5,5 <Limiting magnitude>
Seeing: 8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 342x
Filter(s): O III
Object(s): PNG 232.4-1.8, M1-13, Minkowski 1-13
Category: Planetary nebula.
Constellation: CMa
Data: mag 12,6  size 36" ?
Position: RA 07h:21m 15s  DEC 18:08' 37"
Pos: 07 21 15 / -18 08 37. Fairly bright PN that responds well to the OIII 
filter. At 342x it appears as a small, round ~10" disk that is brighter towards 
the inner part. The edge is quite clearly defined, though not sharp. The NW 
part of the tiny disk seems to be slightly brighter. I could not see any sign 
of a fainter outer shell, so the diameter of the object given in Uranometria 
does not correspond with my observations. The program Guide 6 gives 10" as the 
figure for the diameter of M1-13. The planetary is located less than 1' N of an 
11mag star. Easy object that was not so easy to find with low magnification (131x). 
Uranometria 153
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