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[[Image:Gemini constellation map.png|thumb|right|338px|Location of Castor in the constellation of Gemini]]
'''Castor''', also known as '''Alpha Geminorum''', is a star system in the constellation [[Gemini]]. Despite the star's alpha [[Bayer designation]], it is the second brightest star of the Gemini constellation, with a total apparent magnitude of 1.58.<ref name="illinois">http://stars.astro.illinois.edu/sow/castor.html</ref> Originally thought as a single binary star system, the Castor system is actually three sets of tight, spectroscopic binary stars. Based on measurements from the [[Hipparcos]] mission, it is estimated that the Castor system is 51.6 light years away.<ref name="illinois">http://stars.astro.illinois.edu/sow/castor.html</ref>
'''Castor''', also known as '''Alpha Geminorum''', is a star system in the constellation [[Gemini]]. Despite the star's alpha [[Bayer designation]], it is the second brightest star of the Gemini constellation, with a total apparent magnitude of 1.58.<ref name="illinois">http://stars.astro.illinois.edu/sow/castor.html</ref> Originally thought as a single binary star system, the Castor system is actually three sets of tight, spectroscopic binary stars. Based on measurements from the [[Hipparcos]] mission, it is estimated that the Castor system is 51.6 light years away.<ref name="illinois">http://stars.astro.illinois.edu/sow/castor.html</ref>