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