NGC 2509

NGC 2509 is an open cluster in the constellation of Puppis. It was discovered on 3 December 1783 by William Herschel. It was described as "bright, pretty rich, slightly compressed" by John Louis Emil Dreyer, the compiler of the New General Catalogue.
The cluster is about 14 light-years wide, but the cluster's other parameters remain poorly known. Some studies have estimated a distance of about 9,500 light-years away from the Solar System, while older estimates put it at only 2980 light-years away. Estimates of the cluster's age have also varied significantly, from 1.2 billion years old to 8 billion years old. The latest analysis based on the parallaxes measured by the Gaia spacecraft confirms that it is a relatively distant object, with a distance between 2500 and 3000 parsecs.