M37 Open Cluster in Auriga. A beautiful and compact open cluster of 150 stars that is located approximately 4,400 light years from earth. In a dark sky location, this cluster truly resembles diamonds on black velvet! A topaz colored star lies in the heart of this cluster. Technical: Brandon 130 APO, f/8, Canon 10D, stack of 4 X 90 sec. Colorado Springs, December 2003