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Gemini is dominated by Castor and Pollux, two bright stars that appear relatively very closely together forming an o shape, encouraging the mythological link between the constellation and twinship. The twin above and to the right (as seen from the Northern Hemisphere) is Castor, whose brightest star is α Gem; it is a second-magnitude star and ...
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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.
NGC 2291 is an unbarred lenticular galaxy in the constellation Gemini. It was discovered by John Herschel on January 22, 1827. [ 2 ] The visual magnitude is 13, and the apparent size is 1.0 by 0.8 arc minutes .
NGC 2266 is an open cluster [5] of stars in the constellation of Gemini. It was discovered by German-British astronomer William Herschel on 7 December 1785. [6] This is a relatively dim cluster with an integrated visual magnitude of 9.5 and an angular size of 5.0′. The stellar members can be readily resolved with an amateur telescope. [3]
NGC 2158 is an open cluster in the constellation of Gemini. It is, in angle, immediately southwest of open cluster Messier 35 , and is believed to be about 2 billion years old. [ 2 ] The two clusters are unrelated, as the subject is around 9,000 light years further away.
Messier 35 or M35, also known as NGC 2168 or the Shoe-Buckle Cluster, is a relatively close open cluster of stars in the west of Gemini, at about the declination of the Sun when the latter is at June solstice. [a] It was discovered by Philippe Loys de Chéseaux around 1745 and independently discovered by John Bevis before 1750. [3]
Kappa Geminorum (κ Geminorum, κ Gem) is a binary star system in the northern zodiac constellation of Gemini. It is visible to the naked eye with an apparent visual magnitude of 3.568. [2] Based upon an annual parallax shift of 23.07 mas, [1] the system is located about 141 light years distant from the Sun.