The Iris Nebula (NGC 7023)

on Wednesday, March 23, 2011

by Alvin Jeng

Also known as Caldwell 4.

Taken through LB-0003: 14.5-inch (0.37-meter) RC Optical Systems Ritchey-Chretien reflector with ion-milled optics at f/9.0 on a Software Bisque Paramount ME German Equatorial mount, Apogee Alta U16M CCD camera, LRGB image with exposures of 360, 190, 190, and 190 minutes, respectively

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