Castor (Star)
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Castor is the second brightest star in the constellation Gemini and one of the brightest stars in the night sky. Although it has the Bayer designation "alpha", it is actually fainter than Beta Geminorum. Castor is 49.8 light years away from Earth. Castor was discovered to be a visual binary in 1678, with the magnitude of its components being 2.0 and 2.9. The separation of the components is about 6" and the period of revolution is around 467 years.

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Castor is the second brightest star in the constellation Gemini and one of the brightest stars in the night sky. Although it has the Bayer designation "alpha", it is actually fainter than Beta Geminorum. Castor is 49.8 light years away from Earth. Castor was discovered to be a visual binary in 1678, with the magnitude of its components being 2.0 and 2.9. The separation of the components is about 6" and the period of revolution is around 467 years.