Hadar
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- This is an article on the star Hadar, for the place see Hadar, Ethiopia
Beta Centauri (β Cen / β Centauri), also known as Hadar or Agena, is the second brightest star in the constellation Centaurus and the eleventh brightest star in the nighttime sky.
Beta Centauri is a blue-white giant star that is approximately 525 light-years from the Solar system.
The name hadar comes from the Arabic word for "ground", while the name agena comes from Latin words for "the knee".
- Apparent Visual Brightness (Sirius A = 1): 0.151
- Spectral type: B1 II
- Radial velocity: −12 km/s
- Proper Motion: 0.042 arcsecs/year
- Apparent Visual Magnitude: 0.61
- Absolute Visual Magnitude: −5.42
- Luminosity: 8.6×104 Solar Luminosities