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Alhena

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description Alhena Overview

Alhena, designated Gamma Geminorum, is a white giant star located approximately 109 light-years from Earth in the zodiacal constellation of Gemini. As the third-brightest star in the constellation, it is readily visible to the naked eye under dark sky conditions. Historically, its predictable heliacal rising made it useful for timekeeping and agricultural calendars in ancient cultures. Astronomically, it is a spectroscopic binary system, characterized by a primary star that has evolved away from the main sequence.

help Alhena FAQ

Where is Alhena located in the Gemini constellation?

Alhena is Gamma Geminorum, a bright star associated with the feet of the mythological twin Pollux. It lies roughly 109 light-years from Earth and is visible without a telescope under suitable skies.

Is Alhena a single star or a binary system?

Alhena is a spectroscopic binary, meaning its companion is detected through shifts in the primary star's spectrum rather than easily seen separately. The visible primary is an A-type star much hotter and brighter than the Sun.

Why is Alhena called Gamma Geminorum if it is so bright?

The Bayer designation Gamma Geminorum does not constitute a strict modern brightness ranking. Alhena is generally listed behind Pollux and Castor in Gemini's apparent brightness.

What does the name Alhena mean?

Alhena comes from an Arabic name traditionally interpreted as a brand or mark on a camel. The International Astronomical Union recognizes Alhena as the proper name of Gamma Geminorum's primary component.

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