M67 in Cancer. This images was taken at the 90mm observatory in Harleysville, PA on March 26, 2011 at 12:38 AM. M67 is the nearest old open cluster, and thus has become a standard example for studying stellar evolution. It is probably the second best observed open cluster after the Hyades cluster, which is the nearest open cluster and much younger than M67. M67 has more than 100 stars similar to the Sun, and many red giants. The total star count has been estimated at over 500. Details: Pentax *ist DS attached to the prime focus of a Celestron Omni XLT 150mm refractor. 4 images at 65 seconds each stacked for a total of 4min, 20sec. ISO 800.