Beta Gruis

Stellar classification



  • X 22
  • Y -151
  • Z 90
→ Sol: 177

Object type

  • Long Period Variable candidate
  • Star
  • Infra-Red source
  • UV-emission source
  • Variable Star
simbad:* bet Gru


Beta Gruis (β Gruis, β Gru) is the second brightest star in the southern constellation of Grus. It was once considered the rear star in the tail of the constellation of the (Southern) Fish: it, with α, δ, θ. ι, and λ Gru, belonged to Piscis Austrinus in medieval Arabic astronomy.

This is a red giant star with an estimated mass of about 2.4 times that of the Sun and a surface temperature of approximately 3,480 K, just over half the surface temperature of the Sun. This low temperature accounts for the dull red color of an M-type star. The total luminosity is about 2,500 times that of the Sun, and it has estimated 180 times the Sun's radius.

Beta Gruis is a type semiregular variable (SRb) star that varies in magnitude by about 0.4. It varies between intervals when it displays regular changes with a 37-day periodicity and times when it undergoes slow irregular variability.

Beta Gruis played a crucial part in Perth Observatory's tracking of comet 2000 WM1 LINEAR in December 2001.

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