Trifid, Nebula, M20
Copyright © 2011
Trifid Nebula, M20, NGC 6514, 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.
Distance: 7600 light years.
Camera: SBIG ST-10XME
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: Exposure data lost.
Date: April 2010
Software: Camera and guider control - CCDCommander, MaximDL; calibration and stacking - CCDStack2, further processing in Photoshop CS4.