ARICNS data Radius 143,700 km (0.2064 R☉) Constellation Ophiuchus | Surface temperature 3,026 K Magnitude 14.67 Apparent magnitude (V) 14.67 | |
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Mass 3.123 × 10^29 kg (0.157 M☉) Similar Gliese 1214 b, COROT‑7, 61 Virginis, HD 69830, COROT‑7b | ||
Gliese 1214 is a dim M4.5 red dwarf in the constellation Ophiuchus with an apparent magnitude of 14.7. It is located at a distance of approximately 47 light years from Earth. It is about one-fifth as large as the Sun with a surface temperature estimated to be 3000 K (2730 °C; 4940 °F). Its luminosity is only 0.003% that of the Sun.
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The estimate for the stellar radius is 15% larger than predicted by theoretical models. It also shows a 1% intrinsic variability in the near-infrared probably caused by stellar spots.
Une exoplan te l atmosph re riche en eau gliese 1214 b
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.
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.
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."