(IAAC) Obj: M42 area - Inst: 8" f/6 Dobsonian


Observer: Michael Geldorp
Your skills: Intermediate (some years)
Date/time of observation: 1/8/00  23.12 UT
Location of site: Alphen ad Rijn, Netherlands (Lat 52*N, Elev )
Site classification: Suburban
Sky darkness: 4.5 <Limiting magnitude>
Seeing: II <I-V Seeing Scale (I best)>
Moon presence: None - moon not in sky
Instrument: 8"  f/6 Dobsonian
Magnification: 49X, 98X, 203X, 244X
Filter(s): OIII
Object(s): M42 area
Category: Emission nebula.
Constellation: Ori
Data: mag 4.0  size 1* x 1*
Position: RA 05:35  DEC -05:27
I spent a long time on M42 with my OIII filter. The amount of detail is
overwhelming! The dark fishmouth seemed to float in front of the nebula giving
a 3D effect. There are numerous knots, whisps and streams of gas visible in 
the central areas and also farther out. The following arm leading to a mag 10 
star could be traced clearly for more than one degree, getting fainter at first
and then becoming brighter again towards the star.

M43 also showed much more contrast than without the filter. There was some 
faint nebulosity farther away like NGC 1999 but the filter didn't seem to work
quite so well on them. 

Very good object with OIII
Optional related URLs: http://home.wxs.nl/~geldo006/home.html
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