Pi Puppis

Stellar classification



  • X 741
  • Y -154
  • Z -281
→ Sol: 807

Object type

  • Semi-regular pulsating Star
  • Star
  • Double or multiple star
  • Star in Cluster
  • Infra-Red source
  • Variable Star
simbad:* pi. Pup


Pi Puppis (Pi Pup, π Puppis, π Pup), also named Ahadi, is the second-brightest star in the southern constellation of Puppis. It has an apparent visual magnitude of 2.733, so it can be viewed with the naked eye at night. Parallax measurements yield an estimated distance of roughly 810 light-years (250 parsecs) from the Earth. This is a double star with a magnitude 6.86 companion at an angular separation of 0.72 arcsecond and a position angle of 148°.

The spectrum of Pi Puppis matches a stellar classification of K3 Ib. The Ib luminosity class indicates this a lower luminosity supergiant star that has consumed the hydrogen fuel at its core, evolved away from the main sequence, and expanded to about 48 times the Sun's radius. The effective temperature of the star's outer envelope is about 4,000 K, which gives it the orange hue of a K-type star. It is a semiregular variable star that varies in apparent magnitude from a high of 2.70 down to 2.85. Pi Puppis is the brightest star in the open cluster Collinder 135.

This article uses material from the Wikipedia article "Pi Puppis", which is released under the Creative Commons Attribution-Share-Alike License 3.0.