(IAAC) Obj: M8 (NGC 6523) - Inst: 12.5" f/6.5 Cave equatorial Newtonian

Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 6/18/98 05:15 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA  (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: 121x
Filter(s): O-III
Object(s): M8 (NGC 6523)
Category: Emission nebula.
Constellation: Sagittarius
Data: mag 5.8  size 90'x40'
Position: RA 18:03.8  DEC -24d:31'
M8, or the Lagoon Nebula, was the second of the suggested M objects that I
observed on Wednesday morning.  This very large and bright emission nebula also
contains the young open cluster NGC 6530 and the dark nebulae B88, B89, and B296.
M8 spans about 100 light years and is some 4900 light years distant.
M8's nebulosity was barely visible without the O-III filter.  With the filter in
place nebulosity was clearly evident, the so-called Hourglass was very distinct,
and the major dark lane was quite noticeable.
Optional related URLs: http://www.msd.org/obs.htm
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