PhotographerStephen D Pastor
Location of photoMayhill, New Mexico
Date/Time of photoAug 7 and 8th, 2013
EquipmentTeleVue 140 f/5 refractor and a SBIG ST2000xcm camera (@ -15 degrees)on an Astro-Physics 1200 mount.
DescriptionMessier 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.