NGC7023 Iris Nebula
DETAILS: Images with a 12.5" RCOS Truss RC at f9 mounted on a Paramount ME, guided by ProTrack and an AO-7. Only 60 minutes of Luminance possible due to constant clouds and storms during June and July 2004. RGB=30:30:30 minutes. Aligned in RegiStar, RGB assembled in MaxIm DL with the RC Console, and transported to Photoshop CS for curves and other processing with plug-ins to Photoshop. The Luminance was unbinned, and the RGB binned 2, the LRGB image combined in Photoshop. Due to considerable high clouds and moisture in the atmosphere, heavy processing was necessary to smooth out the noise.
COMMENTARY: NGC7023, know as the Iris Nebula due to its flower-like appearance, is located in the Constellation Cepheus. It is a complex of reflection, emission and dark nebulosity illuminated by a 7.4 magnitude star. The star, HD 200775, is a Herbig Be star that is pre-main sequence with a mass between 3 and 15 solar masses, and is approximately 5,000 years old, very young as stars go. Very faint dark nebulosity surround the entire complex. It is very difficult to see in the eyepiece because of low luminosity, and the bright 7th magnitude star in its center.