Triffid with M21
Exposure type:
Roth Ritter
Lamy, NM on 2009, Jul 11
LRGB (410:80:80:80)
RCOS 10RCA @ f/7 (1825mm)
Paramount ME
SBIG STL-11000M, AO-L, Filter set C L R G B

[ click the photo to enlarge ]
Additional Notes:
The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II region located in Sagittarius. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars, an emission nebula (the lower, red portion), a reflection nebula (the upper, blue portion) and a dark nebula (the apparent 'gaps' within the emission nebula that cause the trifid appearance. M21 is a relatively young cluster of a mere 4.6 million years of age. It is tightly packed but contains about 57 stars. A few blue giant stars have been identified in the cluster, but Messier 21 is composed mainly of small dim stars. With a magnitude of 6.5, M21 is not visible to the naked eye; however, with the smallest binoculars it can be easily spotted on a dark night. [Wikipedia]