Collinder 135

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

Collinder 135
Observation data (2000.0 epoch)
ConstellationPuppis
Right ascension07h 08m [1]
Declination−37° 10′[1]
Distance1,040.5 ly (319 pc [1])
Apparent magnitude (V)2.1[1]
Apparent dimensions (V)50'
Physical characteristics
Other designationsPi Puppis Cluster, Cr 135, C 0715-367

It consists of four stars visible also to naked eye, and a widespread population of 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. The 5th magnitude stars are all variables: one (NV Puppis) is a Gamma Cassiopeiae variable, and the other (NW Puppis) is a Beta Cephei variable.

References
  1. "Cl Collinder 135". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-08-15.
  2. H. Baumgardt (1998). "The Nature of some doubtful Open Clusters as revealed by Hipparcos". Astronomy and Astrophysics. Bibcode:1998A&A...340..402B. Retrieved 2011-08-15.
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