M 20 – Trifid Nebula

Trifid Nebula
M 20
5/18 – 5/22/2017
Brewsky Observatory, Casa Grande, AZ
Celestron Edge/11, SBig STF8300M, St-i Guider, Astrodon filters
# Exp (min) Filter Bin Net Time (min)
19/13 15 Red 1×1/2×2 480
14/10 15 Green 1×1/2×2 360
20/14 15 Blue 1×1/2×2 510
26 15 HAlpha 1×1 390
Total 29 hr
Calibrated in Maxim/DL
Aligned, processed with PixInsight
The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II region located in Sagittarius. It was discovered by Charles Messier on June 5, 1764. 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 trifurcated appearance; these are also designated Barnard 85). Viewed through a small telescope, the Trifid Nebula is a bright and peculiar object, and is thus a perennial favorite of amateur astronomers.

The Trifid Nebula is a star-forming region in the Scutum spiral arm of the Milky Way. The most massive star that has formed in this region is HD 164492A, an O7.5III star with a mass more than 20 times the mass of the Sun. This star is surrounded by a cluster of approximately 3100 young stars.