March 24, 2019

AstroEvent of the Week: 25.05.09: Castor: a Sextuplet Star!

This week’s astro-challenge is a unique multiple star system…Castor, also known as Alpha Geminorum, rides high in the west of the northern hemisphere sky on clear late May evenings. Shining at a brightness of magnitude +1.6, it forms one half of the pair Castor and Pollux, known as the Twin stars of Gemini.

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