Star
Alhena
White star · A0IV
γ Geminorum · Gemini
Shown in its true colour — like most stars, it is too far away to photograph as more than a point of light.
Gamma Geminorum, formally named Alhena, is the third-brightest object in the constellation of Gemini. It has an apparent visual magnitude of 1.9, making it easily visible to the naked eye even in urban regions. Based upon parallax measurements with the Hipparcos satellite, it is located at a distance of roughly 109 light-years.
Description from Wikipedia (CC BY-SA 4.0).
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Key facts
Distance
~109 light-years
Apparent mag.
+1.93
Spectral type
A0IV
Luminosity
165 × Sun
Absolute mag.
−0.70
Catalogue
HIP 31681
Spectral type
A0IV
True colour from its B–V index (0.00): a surface around 10100 K.
Did you know
- Alhena is also known as γ Geminorum.
- Its spectral type A0IV marks it as a white star.
- It lies in the constellation Gemini.
