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Obj: M 108 - Inst: 15 inch Obsession f4,5



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Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 12 May 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Exurban
Sky darkness: ~6 <Limiting magnitude>
Seeing: 8-9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 244x
Filter(s): 
Object(s): M 108
Category: External galaxy.
Class: 
Constellation: UMa
Data: mag 10,5  size 8,8x2'
Position: RA :  DEC :
Description:
At 244x I could see several features within the approx 2’x8’ long bright 
galaxy. The most obvious detail is a 1’ long, oval patch towards the W edge of 
M108. This cloud appears bright and is easily visible. More subtle is another 
elongated patch in the galaxy’s center. Between that patch and the western 
cloud is a dark irregular rift that winds further along the southern side of M108. I 
could see 3 stars embedded in M108, the brightest one (~13mag) near the center 
and two fainter stars (~14,5mag) E and further NE of the center. Just N of the 
center near the brightest foreground star I could see another faint star or 
star-like cloud in M108. That one only with AV and with difficulty. Though not 
as bright as M82, M108 is as spectacular and rich in detail as M82.
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