![Star Castor](http://www.star-registration.com/cdn/shop/articles/stars_desktop_1.5x_cc200fcc-9fa5-46ea-b5f7-d72f06d431cc.jpg?v=1657104170&width=1400)
Star Castor
The star Castor is the second brightest star in the constellation of Gemini and has long been known as a special six-star system.
Facts about Castor
The star Castor is 51 light-years away and with about 2.7 solar masses it is a blue main sequence star. In addition, its magnitude is 1.58 mag. Castor is a rare six-star system where three individual stars can be seen through the view of a telescope: Castor A, Castor B and YY Geminorum. These 3 stars are also in reality binary stars. The two brightest stars are A-class main sequence stars, which are more massive and brighter than the Sun. In addition, all three pairs of stars orbit around a common center of gravity (barycenter). To the naked eye Castor appeared as a single star and only years later was recorded as a multiple star system.
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