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

Collinder 135
Collinder 135
Observation data (2000.0 epoch)
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
Associations
ConstellationPuppis
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.

References

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  1. ^ a b c d "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. 340: 402. Bibcode:1998A&A...340..402B.
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