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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.
Eumnamusun_(Kalopanax_septemlobus)_blanched_prickly_castor_oil_tree_shoots.jpg (698 × 523 pixels, file size: 124 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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 .
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 ...
A visual band light curve for the 1979-1980 eclipse of Eta Geminorum [22] In 1865, Julius Schmidt first reported that η Geminorum was a variable star. The light variations were described by Schmidt and other observers as having long maxima of constant brightness, minima of greatly varying size and shape, and a period around 231 days. [23]
Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long. [119] Individual trees in the clonal patch have been listed as having ages of 2000 [120] [121] or even to 3000 years old. [122] [123]
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Delta Geminorum is a subgiant star with the stellar classification F0 IV. [3] It is about 60.5 light-years (18.5 parsecs) distant. [1] This star has 1.57 times the mass of the Sun [6] and is rotating rapidly with a projected rotational velocity of 129.7 km s −1. [8] The estimated age is 1.6 billion years. [7]