Ha filament PiPuppis Cluster

Around the orange supergiant Ahadi (or Pi Puppis), directly southward from Canis Major are a swarm of fainter stars that together make up the Pi Puppis Cluster. With a visual magnitude of +2.7, Ahadi is by far the most prominent menber of the cluster, but three other stars are also visible to the naked eye. These three blue stars form an approximate line, with v2 Puppis and NV Puppis lying close together, and HR 2770 falling more distantly from the others in the sky. The cluster also contains many other less luminous stars.