Collinder 135

Collinder 135, known sometimes as the Pi Puppis Cluster, is an open cluster in Puppis constellation.

Collinder 135
Simulated image of the Pi Puppis Cluster
Observation data (2000.0 epoch)
Right ascension	07h 08m [1]
Declination	−37° 10′[1]
Distance	1,040.5 ly (319 pc [1])
Apparent magnitude (V)	2.1[1]
Apparent dimensions (V)	50'
Physical characteristics
Other designations	Pi Puppis Cluster, Cr 135, C 0715-367
Associations
Constellation	Puppis
See also: Open cluster, List of open clusters

It consists of six stars brighter than 6th magnitude, and a widespread population of fainter stars.^[2] It lies in the southern celestial hemisphere near a rich star field. The main component is the star Pi Puppis, which gives to the cluster its common name; it is an orange supergiant with a visual magnitude of 2.71. Two of the 5th magnitude stars are all variables: NV Puppis is a Gamma Cassiopeiae variable, while NW Puppis is a Beta Cephei variable.