The Trifid Nebula | Stephen D Pastor

Photographer
Stephen D Pastor
Email
astro3d@pvtnetworks.net
Location of photo
Mayhill, New Mexico
Date/Time of photo
Aug 7 and 8th, 2013
Equipment
TeleVue 140 f/5 refractor and a SBIG ST2000xcm camera (@ -15 degrees)on an Astro-Physics 1200 mount.
Description
Messier 20 is both an emission nebula (H-II region imaged in red) and reflection nebula (blue coloration), which is found in the constellation Sagittarius. Admiral Smyth writes in his “ A Cycle of Celestial Objects” (2nd Edition, 1881) that J. Herschel’s catalog of 1864 summarized M20 as “!!!; vB; vL; trifid; : involved”, which stands for “very remarkable; very bright; very large; trifid; double star involved.” Image is a total of 4 hr 20 min exposure (26 x 10 min lights, 64 flats, 64 bias, 15 darks) that was calibrated, aligned, integrated, and processed in PixInsight 1.8 with final levels/curves in Photoshop CS6. Optec Alnitak panel used for flats.
All comments must follow the Sky & Telescope Terms of Use and will be moderated prior to posting. Please be civil in your comments. Sky & Telescope reserves the right to use the comments we receive, in whole or in part, and to use the commenter’s username, in any medium. See also the Terms of Use and Privacy Policy.

COMMENT