Beta Hydri

From Growing Horizons
Beta Hydri
Location of β Hydri (circled)
Spectral ClassG2IV
Mass M1.08 M
Surface Temperature5872 K
Heim-Feynman Limit Distance5.2 AU
Distance to Sol24.33 ly

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.


Geophysical Data
Distance from Primary1.24 AU
Planet TypeGaian
Natural Satellites2
Mean Temperature22°C
Surface Water64%
Age6.4 billion years
Nations (2185)
  • Empire of Jerat
  • Republic of Quaud
  • United Principalties of Jerat
  • Union of Free Jerat Republics
  • Krendal Coalition
  • Federation of Ternak Provinces
  • Rak'ris'ayc Freehold
Demographics (2185)
Empire of Jerat 
1.5 billion Tiaunt
Republic of Quaud 
965 million Tiaunt
United Principalties of Jerat 
1.1 billion Tiaunt
Union of Free Jerat Republics 
738 million Tiaunt
Krendal Coalition 
1.4 billion Tiaunt
Federation of Ternak Provinces 
1.2 billion Tiaunt
Rak'ris'ayc Freehold


Geophysical Data
Distance from Primary1.7 AU
Planet TypeEoArean
Natural Satellites1
Mean Temperature15°C
Surface Water41%
Age6.4 billion years
Demographics (2185)
  • 700 million Tiaunt
  • 65 million Rak'ris'ayc