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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 ...
PKS 0735+178 is a classical BL Lac object in the northern constellation of Gemini. This is one of the brightest objects of its type in the night sky. [5] It has a redshift of z = 0.424, with a luminosity distance of 7,380 million light-years (2,263 Mpc). PKS 0735+178 is a nearly point-like source with an angular size of a milliarcsecond. [3]
Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04, [ 2 ] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.88 mas , [ 1 ] it is around 253 light years from the Sun .
1 Geminorum is a triple star system 0.17 degree south of the ecliptic. The primary component of the system, 1 Geminorum A, is a K-type red clump giant star around twice the mass of the Sun . [ 11 ] Component A is orbited by a spectroscopic binary pair of stars at a separation of about 9.4 astronomical units every 4877.6 days.
Eta Geminorum (η Geminorum, abbreviated Eta Gem, η Gem), formally named Propus / ˈ p r oʊ p ə s /, [16] [14] is a triple star system in the constellation of Gemini. It is a variable star visible to the naked eye , around 380 light years from the Sun .
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.
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.
Pollux is the brightest star in the constellation of Gemini. It has the Bayer designation β Geminorum , which is Latinised to Beta Geminorum and abbreviated Beta Gem or β Gem . This is an orange-hued, evolved red giant located at a distance of 34 light-years , making it the closest red giant (and giant star ) to the Sun.