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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 ...
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.
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 ...
As a result, the brightest star in each class did not always get listed first in Bayer's order—and the brightest star overall did not necessarily get the designation "Alpha". A good example is the constellation Gemini, where Pollux is Beta Geminorum and the slightly dimmer Castor is Alpha Geminorum.
Iota Geminorum (ι Geminorum, ι Gem) is a solitary [9] fourth-magnitude star in the constellation Gemini. In the sky, it forms an isosceles triangle with Castor and Pollux , and is located less than a degree from the 5th magnitude stars 64 and 65 Geminorum.
Gamma Geminorum (γ Geminorum, abbreviated Gamma Gem, γ Gem), formally named Alhena / æ l ˈ h iː n ə /, [13] is the third-brightest object in the constellation of Gemini. It has an apparent visual magnitude of 1.9, [ 2 ] making it easily visible to the naked eye even in urban regions .
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...