Messier 67 (Cancer)

Object image
Fig.1 - One of the oldest known open clusters: Messier 67 in the constellation Cancer, photographed with a 16-inch f/4.5 Dob on an equatorial platform.
Object name: Constellation: Coordinates: Apparent size: Visual brightness:
Messier 67 (NGC 2682) Cancer 08h51m / +11°49' 30' 6.9 mag

The open cluster Messier 67 (NGC 2682, also called King Cobra cluster) in the constellation Cancer. Messier 67 is one oldest known open clusters and contains about 500 stars. Estimates of its age range between 3.2 and 5 billion years. Messier 67 is 2,600 - 2,900 light-years from Earth and was discovered by Johann Gottfried Koehler in 1779 (source: Wikipedia).

Twenty-five 3-minute exposures (72 minutes total exposure) at ISO 400 taken on February 19 / 20, 2021 were added for this shot with the DeepSkyStacker software and the final image processing was done in Photoshop. A first quarter moon high in the sky and rather dense cirrostratus clouds made it difficult to image the open cluster.

Equipment: Nikon D7500 Lifepixel h-alpha modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system.

Search chart
Fig.2 - Search chart for Messier 67. Map © 2021 "The Mag-7 Star Atlas Project", www.siaris.net. Map is slightly modified. The map can be downloaded here.