Object name: NGC2186
NGC 2186 is a type II2p open cluster in eastern Orion about half way between Betelgeuse and the Rosette Nebula. WEBDA says it is about 55 million years old, 4,700 light-years distant and reddened by only 0.27 magnitudes. This means its O and B stars have died though late B might create still exist as a red giant, maybe the one seen at the top of the cluster. Brilliant A and F stars make up most of the blue stars seen in this cluster.