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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 ...
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.
• HD = Henry Draper Catalogue designation number • HIP = Hipparcos Catalogue designation number • RA = Right ascension for the Epoch/Equinox J2000.0 • Dec = Declination for the Epoch/Equinox J2000.0 • vis. mag. = visual magnitude (m or m v), also known as apparent magnitude • abs. mag. = absolute magnitude (M v)
Rho Geminorum (ρ Gem) is a star system that lies 59 light-years away in the constellation of Gemini, about 5 degrees west of Castor.The system consists of a primary bright enough to be seen with the naked eye, a faint secondary which has rarely been observed even professionally, and a distant, somewhat bright tertiary which requires telescopic equipment for observation.
74 Geminorum (f Geminorum) is a K-type giant star in the constellation Gemini. It is located about 640 light-years from Earth based on its Gaia DR3 parallax. The star is often subject to lunar occultations, allowing an accurate measurement of its angular diameter. [1] It has an apparent magnitude of 5.05, making it faintly visible to the naked ...
Xi Geminorum (ξ Geminorum, abbreviated Xi Gem, ξ Gem), formally named Alzirr / ˈ æ l z ər /, [10] is a star in the zodiac constellation of Gemini. It forms one of the four feet of the outline demarcating the Gemini twins. [11] The star has an apparent visual magnitude of 3.35, [2] which is bright enough for it to be seen with the naked eye.
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.