Gliese 1214
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 15m 18.94s |
| Declination | +04° 57′ 49.7″ |
| Apparent magnitude (V) | 14.67[1] |
| Characteristics | |
| Spectral type | M4.5[1] |
| Apparent magnitude (B) | 16.40 |
| Apparent magnitude (R) | 13.8 |
| Apparent magnitude (I) | 11.1 |
| Apparent magnitude (J) | 9.75 |
| Apparent magnitude (H) | 9.09 |
| Apparent magnitude (K) | 8.78 |
| B−V color index | 1.73 |
| V−R color index | 0.9 |
| R−I color index | 2.7 |
| Variable type | planetary transit |
| Astrometry | |
| Proper motion (μ) | RA: 585 mas/yr Dec.: -752 mas/yr |
| Distance | 42.38 ly (13 pc) |
| Absolute magnitude (MV) | 14.10 |
| Details | |
| Mass | 0.157 ± 0.019[2] M☉ |
| Radius | 0.211 ± 0.0097[2] R☉ |
| Luminosity | 0.00328[2] L☉ |
| Surface gravity (log g) | 4.15 |
| Temperature | 3,026 ± 130[2] K |
| Metallicity | 0.39 ± 0.15.[3] |
| Age | 6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia |
data |
Gliese 1214 (GJ 1214) is a dim M4.5[1] red dwarf in the constellation Ophiuchus with an apparent magnitude of 14.7.[1] It is located at a distance of approximately 40 light years from Earth. It is about one-fifth as large as the Sun[4] with a surface temperature estimated to be 3,000 K (2,730 °C; 4,940 °F).[4] Its luminosity is only 0.3% that of the Sun.[4]
The estimate for the stellar radius is 15% larger than predicted by theoretical models.[2]
Contents |
[edit] 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.[2][4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | 0.0179 ± 0.0027 MJ | 0.0143 ± 0.0019 | 1.5803925 ± 0.0000117 | <0.27 |
Discovered by the MEarth project and investigated further by the HARPS spectrograph on ESO’s 3.6-metre telescope at La Silla, Gliese 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.
[edit] See also
[edit] References
- ^ a b c d e "LHS 3275 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GJ+1214. Retrieved 2009-12-16.
- ^ a b c d e f g Charbonneau, David; Zachory K. Berta, Jonathan Irwin, Christopher J. Burke, Philip Nutzman, Lars A. Buchhave, Christophe Lovis, Xavier Bonfils, David W. Latham, Stéphane Udry, Ruth A. Murray-Clay, Matthew J. Holman, Emilio E. Falco, Joshua N. Winn, Didier Queloz, Francesco Pepe, Michel Mayor, Xavier Delfosse, Thierry Forveille (2009). "A super-Earth transiting a nearby low-mass star". Nature 462 (17 December 2009): 891–894. Bibcode 2009Natur.462..891C. doi:10.1038/nature08679. PMID 20016595. http://arxiv1.library.cornell.edu/abs/0912.3229. Retrieved 2009-12-15.
- ^ Rojas-Ayala, Barbara; Covey, Kevin R.; Muirhead, Philip S.; Lloyd, James P. (26 July 2010). "Metal-Rich M-dwarf Planet Hosts: Metallicities with K-Band Spectra". e-Print. arXiv:1007.4593v1. Bibcode 2010arXiv1007.4593R. http://arxiv.org/PS_cache/arxiv/pdf/1007/1007.4593v1.pdf.
- ^ a b c d David A. Aguilar (2009-12-16). "Astronomers Find Super-Earth Using Amateur, Off-the-Shelf Technology". Harvard-Smithsonian Center for Astrophysics. http://www.cfa.harvard.edu/news/2009/pr200924.html. Retrieved December 16, 2009.
[edit] External links
Coordinates: 
17h 15m 18.94s, +4° 57′ 49.7″
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