Here is a bi-color combine of the Ha[+NII] and OIII data. I had to tone down the Ha so that the OIII would show up. The OIII is so dim from my backyard, and my camera so less sensitive to it, that I would have to take a lot more than 5 hours to brighten it up. There are many great images of this object around the web. Some of my favorites are Jim Wood and Emanuele Colognato's,
here, and Ken Crawford's,
here, taken with, respectively, 24" and 20" telescopes, and from darker skies. The Crescent Nebula is about 5,000 light years away in the constellation Cygnus.
Telescope: Orion 6" f/5 Imaging Newtonian and Astro-Tech Coma Corrector (eff. at f/5.5)
Camera and Exposure: Ha (13x20'), OIII (15x20'), thru the SXVF-H9, Alnitak Flat-man flats
Filter: Astronomik 12nm Ha & OIII
Guiding: SX Lodestar and SX OAG
Mount: Takahashi NJP
Software: Nebulosity, Maxim DL, Registar, Photoshop CS3
Location: The Woodlands, TX
Hat tip to Steve Cannistra for the bi-color processing method.
No comments:
Post a Comment