(IAAC) Obj: M 20, Trifid Nebula - Inst: 15 inch Obsession f4,5

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Sat Jul 17 00:16:10 EDT 2004


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

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 16 Jul 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Exurban
Sky darkness: 5,5 mag <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 131, 244,  342x
Filter(s): none
Object(s): M 20, Trifid Nebula
Category: Emission nebula.
Constellation: Sgr
Data: mag -  size 30x20'
Position: RA :  DEC :
The Trifid Nebula looks spectacular at all powers and particularly at high 
power. 342x does reveal a number of detail in the nebula and its 3 prominent 
dark lanes. The W lane does actually split up into 2 lanes (one going N, the 
other going W). The S lane is the thinnest and features sharp edges. As it goes 
over into the E lane it does get wider and the edges are not as well defined 
anymore. North of M20 I could see the faint mottled glow of the attached 
reflection nebula. This part of M20 is better seen at 131x because of its very 
low SB. The Trifid Nebula is a very difficult object in a small scope and so I 
was surprised to find it that spactacular in my 15-inch Dobson.

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