M101 Color Image from the KPNO 4-m Mayall Telescope

An approximately true color (B and R) image of the nearby Sc galaxy M101 taken with the KPNO 4-m Mayall telescope with the 8K x 8K CCD Mosaic imager. Each color was built from a dithered sequence of five 180 second exposures. The data were processed using the IRAF Mosaic package MSCRED to remove cosmetic defects, to fill in the gaps between the CCDs, and to geometrically correct the two images onto the same astrometric system

Image taken by T. Armandroff and T. Boroson.