Gliese 180 (often shortened to GJ 180), is a small red dwarf star in the equatorial constellation of Eridanus. It is invisible to the naked eye with an apparent visual magnitude of 10.9.[2] The star is located at a distance of 39 light years from the Sun based on parallax,[1] and is drifting closer with a radial velocity of −14.6 km/s.[9] It has a high proper motion, traversing the sky at the rate of 0.765 arcseconds per year.[10]
The stellar classification of GJ 180 is catalogued as M2V[3] or M3V,[4] depending on the study, which indicates this is a dim red dwarf – an M-type main-sequence star that is generating energy by core hydrogen fusion. Reiners and associates (2012) do not consider it to be an active star.[11] It is about five[7] billion years old and is spinning with a projected rotational velocity of ~3 km/s,[5] giving it a rotation period of about 65 days.[6] The star has 43% of the Sun's mass and 42% of the radius of the Sun. It is radiating just 2.4%[3] of the luminosity of the Sun from its photosphere at an effective temperature of 3,634 K.[5]
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Gliese180 (often shortened to GJ 180), is a small red dwarf star in the equatorial constellation of Eridanus. It is invisible to the naked eye with an...
is thus no longer considered habitable. Several other planets, such as Gliese180 b, also appear to be examples of planets once considered potentially habitable...
Gliese 900 (GJ 900, BD+00 5017) is a triple star system, located 68 light-years from Earth in the constellation Pisces. It is made up of three main sequence...
(b, c and d). The nearest system with four or more confirmed planets is Gliese 876, with four known.[citation needed] The farthest confirmed multiplanetary...
Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2023-11-25. GJ 180 d GJ 229 A c Feng, Fabo; Butler, R. Paul; Shectman, Stephen A.; Crane, Jeffrey...
September 2012, the discovery of two planets orbiting Gliese 163 was announced. One of the planets, Gliese 163 c, about 6.9 times the mass of Earth and somewhat...
Gregory W.; Laughlin, Gregory (2014). "The Lick–Carnegie exoplanet survey: Gliese 687 b: A Neptune-mass planet orbiting a nearby red dwarf". The Astrophysical...
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