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Castor is the second-brightest object in the zodiac constellation of Gemini. It has the Bayer designation α Geminorum, which is Latinised to Alpha Geminorum and abbreviated Alpha Gem or α Gem. With an apparent visual magnitude of 1.58, it is one of the brightest stars in the night sky.
Castor's torso is represented by the star τ Gem, Castor's left hand by ι Gem (which he shares with Pollux), Castor's right hand by θ Gem; all three of these stars are of the fourth magnitude. Castor's pelvis is represented by the star ε Gem , Castor's left foot by ν Gem , and Castor's right foot by μ Gem and η Gem ; ε, μ, and η Gem ...
Castor [a] and Pollux [b] (or Polydeuces) [c] are twin half-brothers in Greek and Roman mythology, known together as the Dioscuri or Dioskouroi. [d]Their mother was Leda, but they had different fathers; Castor was the mortal son of Tyndareus, the king of Sparta, while Pollux was the divine son of Zeus, who seduced Leda in the guise of a swan. [2]
β Geminorum (Latinised to Beta Geminorum) is the star's Bayer designation. The traditional name Pollux refers to the twins Castor and Pollux in Greek and Roman mythology. [16] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [17] to catalog and standardize proper names for stars.
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Gemini constellation map showing Castor, Pollux, Procyon and Beta Canis Minoris (Gomeisa) Al-Dhira' and similar spellings (e.g. "Alderaan", [citation needed] "Al-Dhirá'án", [1] "Aldryan" [2]) is a disused name for the two pairs of stars α and β Canis Minoris (Procyon and Gomeisa) and α and β Geminorum (Castor and Pollux).
π Geminorum (Latinised as Pi Geminorum, abbreviated to π Gem or pi Gem) is a star located in the constellation Gemini, to the north of Castor. With an apparent visual magnitude of 5.14, [ 2 ] it is faintly visible to the naked eye on a dark night.
Epsilon Geminorum or ε Geminorum, formally named Mebsuta / m ɛ b ˈ s uː t ə /, [11] [12] is a star in the constellation of Gemini, on the outstretched right 'leg' of the twin Castor. The apparent visual magnitude of +3.06 [2] makes it one of the brighter stars in this constellation. The distance to this star is determined at 860 light ...