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GJ 1214 b
|- |- |- GJ 1214 b Extrasolar planet List of extrasolar planets|- Size comparison of GJ 1214 b with Earth (left) and Neptune (right). GJ 1214 b is shown as blank because its detailed surface features are unknown. |- Parent star Star GJ 1214 Constellation Ophiuchus Right ascension (a) 17h 15m 18.94s Declination (d) +04° 57' 49.7? Apparent magnitude (mV) 14.67 Distance 40 ly (13 pc) Spectral type M4.5 Mass (m) 0.157 M? Radius (r) 0.211 R? Temperature (T) 3026 K Age 6 Gyr Orbital elements Semimajor axis (a) 0.0143 ± 0.0019 AU (2.14 Gm)     1.1 mas Eccentricity (e) Orbital period (P) 1.5803925 ± 0.0000117 d (0.004326803 y)     (37.92942 h) Orbital speed (?) 99 km/s Inclination (i) 88.62+0.36 -0.28° Time of transit (Tt) 2,454,999.712703 ± 0.000126 JD Physical characteristics Mass (m) 6.55 ± 0.98 (HARPS) M? Radius (r) 2.678 ± 0.13 R? Density (?) 1870 ± 400 kg m-3 Surface gravity (g) 0.91 g Temperature (T) 393–555 (equilibrium) K Discovery information Discovery date December 16, 2009 Discoverer(s) David Charbonneau, et.al. Detection method Transit (MEarth Project) Discovery site Fred Lawrence Whipple Observatory Discovery status Published Database references Extrasolar Planets Encyclopaedia data SIMBAD data GJ 1214 b is an extrasolar planet that orbits the star GJ 1214. The parent star is 13 parsecs (approximately 40 light-years) from the Sun, in the constellation Ophiuchus. The planet was discovered in December 2009. It is classified as a super-Earth because it is larger than Earth but has a mass and radius significantly less than those of the gas giants in the Solar System. After COROT-7b, it is the second such planet to be known and is the first of a new class of planets with small size and relatively low density. GJ 1214 b is also significant because its parent star is relatively near the Sun and because it transits (crosses in front of) that parent star, which allows the planet's atmosphere to be studied using spectroscopic technologies. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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