Beta Hydri

Stellar classification



  • X 15
  • Y -16
  • Z 11
→ Sol: 25

Object type

  • High proper-motion Star
  • Star
  • Infra-Red source
  • UV-emission source
  • Variable Star
simbad:* bet Hyi


Beta Hydri (β Hyi, β Hydri) is a star in the southern circumpolar constellation of Hydrus. (Note that Hydrus is not the same as Hydra.) With an apparent visual magnitude of 2.8, this is the brightest star in the constellation. Based upon parallax measurements the distance to this star is about 24.33 light-years (7.46 parsecs).

This star has about 104% of the mass of the Sun and 181% of the Sun's radius, with more than three times the Sun's luminosity. The spectrum of this star matches a stellar classification of G2 IV, with the luminosity class of 'IV' indicating this is a subgiant star. As such, it is a slightly more evolved star than the Sun, with the supply of hydrogen at its core becoming exhausted. It is one of the oldest stars in the solar neighborhood. This star bears some resemblance to what the Sun may look like in the far distant future, making it an object of interest to astronomers.

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