Gliese 1214
Gliese 1214 is a dim M4.5[4] red dwarf in the constellation Ophiuchus with an apparent magnitude of 14.7.[3] It is located at a distance of approximately 47 light years from Earth.[9] It is about one-fifth as large as the Sun[10] with a surface temperature estimated to be 3000 K (2730 °C; 4940 °F).[10] Its luminosity is only 0.003% that of the Sun.[10]
The estimate for the stellar radius is 15% larger than predicted by theoretical models.[7] It also shows a 1% intrinsic variability in the near-infrared probably caused by stellar spots.[3]
Planetary system
In mid-December 2009, a team of Harvard-Smithsonian astronomers announced the discovery of a companion extrasolar planet, Gliese 1214 b, potentially composed largely of water and having the mass and diameter of a super-Earth.[7][10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 6.55 ± 0.98 M⊕ | 0.0143 ± 0.0019 | 1.58040456 ± 1.6x10−7[11] | <0.27 | 88.17° | 2.64 ± 0.13 R⊕ |
Discovered by the MEarth project and investigated further by the HARPS spectrograph on ESO’s 3.6-metre telescope at La Silla, GJ 1214 b is the second super-Earth exoplanet for which astronomers have determined the mass and radius, giving vital clues about its structure. It is also the first super-Earth around which an atmosphere has been found. A search for additional planets using transit timing variations was negative.[3]
No transit-time variations have yet been found for this transit. As of 2012, "the given data does not allow us to conclude that there is a [second] planet in the mass range 0.1–5 Earth-masses and the period range 0.76–1.23 or 1.91–3.18 days."[11]
See also
References
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Coordinates: 
17h 15m 18.94s, +4° 57′ 49.7″
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- ↑ 11.0 11.1 Lua error in package.lua at line 80: module 'strict' not found.
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