Star

Castor

α Geminorum · HIP 36850 · White main-sequence star

True colour from its B–V index (0.03) — a surface around 9,800 K.

Distance

50.9 light-years

Spectral type

A2Vm

Brightness

mag 1.58

Absolute mag

0.61

Luminosity

49 × Sun

Surface

~9,800 K

Right ascension

7h 34m 36s

Declination

+31° 53′

In your sky

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Distances and spectral types: HYG Database (Hipparcos parallaxes), CC BY-SA 4.0.