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Gemini is one of the constellations of the zodiac and is located in the northern celestial hemisphere. It was one of the 48 constellations described by the 2nd century AD astronomer Ptolemy , and it remains one of the 88 modern constellations today.
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.
With an apparent visual magnitude of 1.58, it is one of the brightest stars in the night sky. Castor appears singular to the naked eye, but it is actually a sextuple star system organized into three binary pairs. Although it is the 'α' (alpha) member of the constellation, it is half a magnitude fainter than 'β' (beta) Geminorum, Pollux.
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]
It is located in the northern hemisphere, about 73 light-years from the Earth, in the constellation of Gemini. [12] It is visually close to Pollux, the brightest star in the constellation. [7] HD 63433 is predicted to approach within 7.33 light-years of the Sun in 1.33 million years. [21] That will make it one of the nearest stars to the Sun.
NGC 2355 also known as NGC 2356, [3] is an old open cluster in the constellation Gemini. It is approximately a billion years old and is located about 5,400 light years (ly) from the Solar System and 1,100 ly above the plane of the Milky Way galaxy. At that distance, the angular size of the cluster halo corresponds to a radius of about 23 ly.
NGC 2129 is an open cluster in the constellation Gemini. It has an angular distance of 2.5 arcminutes and is approximately 2.2 ± 0.2 kpc (~7,200 light years) from the Sun inside the Local spiral arm. [3] At that distance, the angular size of the cluster corresponds to a diameter of about 10.4 light years.
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.