(IAAC) Obj: M16 (NGC 6611) - Inst: 12.5" f/6.5 Cave equatorial Newtonian


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 6/18/98 06:05 UT
Location of site: Naylor Observatory http://www.msd.org/obs.htm (Lat 40.1d N, 76.9d W, Elev 570')
Site classification: Exurban
Sky darkness: ~5.0 <Limiting magnitude>
Seeing: 8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 12.5" f/6.5 Cave equatorial Newtonian
Magnification: 65x, 121x
Filter(s): O-III
Object(s): M16 (NGC 6611)
Category: Emission nebula.
Constellation: Serpens
Data: mag 6.0  size 35.0' x 28.0'
Position: RA 18:18.8  DEC -13:47

Also known as the Eagle or Star Queen Nebula, M16 is a fairly large nebula and 
associated open cluster that lies at a distance of 5900 light years.  M16 spans
about 14 light years and is some 5,500,000 years old.  The open cluster consists
of approximately 40 to 60 stars.  The Eagle Nebula's talons were the subject of 
one of the Hubble Space Telescope's most famous images.
Only the star cluster could be seen without a nebula filter.  M16 appeared as a 
region of pale luminosity when an O-III filter was used.  The dark regions such 
as the Elephant's Trunk were not visible.
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