K2-18
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 Artist's impression of the K2-18 system, with K2-18 on left, K2-18b on right, and K2-18c between. Credit: ESA/Hubble | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 30m 14.518s[1] |
| Declination | +07° 35′ 18.26″[1] |
| Apparent magnitude (V) | 13.50[2] |
| Characteristics | |
| Evolutionary stage | Red dwarf |
| Spectral type | M2.8[3] |
| Astrometry | |
| Proper motion (μ) | RA: −80.377[1] mas/yr Dec.: −133.142[1] mas/yr |
| Parallax (π) | 26.2686 ± 0.0546[1] mas |
| Distance | 124.2 ± 0.3 ly (38.07 ± 0.08 pc) |
| Details | |
| Mass | 0.495[4] M☉ |
| Radius | 0.469[4] R☉ |
| Luminosity | 0.0234[5] L☉ |
| Temperature | 3,503[4] K |
| Metallicity [Fe/H] | 0.123±0.157[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
K2-18, also known as EPIC 201912552, is a red dwarf star located 124 light-years (38 pc) from Earth, in the constellation of Leo. This star has an exoplanet, called K2-18b, a super-Earth located within the habitable zone of K2-18.[7][8] It is the first exoplanet in the habitable zone to have water discovered in its atmosphere. There is also a second planet K2-18c.[9]
References[edit]
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode:2012yCat.1322....0Z.
- ^ Montet, Benjamin T.; et al. (5 August 2015). "Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation". The Astrophysical Journal. 809 (1): 25. arXiv:1503.07866. Bibcode:2015ApJ...809...25M. doi:10.1088/0004-637X/809/1/25.
- ^ a b c Cloutier, R.; Astudillo-Defru, N.; Doyon, R.; Bonfils, X.; Almenara, J.-M.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Menou, K.; Murgas, F.; Pepe, F.; Santos, N. C.; Udry, S.; Wünsche, A. (2019). "Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES". Astronomy & Astrophysics. 621: A49. arXiv:1810.04731. Bibcode:2019A&A...621A..49C. doi:10.1051/0004-6361/201833995.
- ^ Martinez, Arturo O.; Crossfield, Ian J. M.; Schlieder, Joshua E.; Dressing, Courtney D.; Obermeier, Christian; Livingston, John; Ciceri, Simona; Peacock, Sarah; Beichman, Charles A.; Lépine, Sébastien; Aller, Kimberly M.; Chance, Quadry A.; Petigura, Erik A.; Howard, Andrew W.; Werner, Michael W. (2017). "Stellar and Planetary Parameters for K2's Late-type Dwarf Systems from C1 to C5". The Astrophysical Journal. 837 (1): 72. arXiv:1701.00588. Bibcode:2017ApJ...837...72M. doi:10.3847/1538-4357/aa56c7.
- ^ Benneke, Björn; Werner, Michael; Petigura, Erik; Knutson, Heather; Dressing, Courtney; Crossfield, Ian J. M.; Schlieder, Joshua E.; Livingston, John; Beichman, Charles; Christiansen, Jessie; Krick, Jessica; Gorjian, Varoujan; Howard, Andrew W.; Sinukoff, Evan; Ciardi, David R.; Akeson, Rachel L. (2017). "SPITZEROBSERVATIONS CONFIRM AND RESCUE THE HABITABLE-ZONE SUPER-EARTH K2-18b FOR FUTURE CHARACTERIZATION". The Astrophysical Journal. 834 (2): 187. arXiv:1610.07249. Bibcode:2017ApJ...834..187B. doi:10.3847/1538-4357/834/2/187.
- ^ "HABITABLE EXOPLANETS CATALOG". UPR. 7 March 2016. Retrieved 12 September 2019.
- ^ "EPIC 201912552 b reality check drewexmachina 11-22-2015". Drew ExMachina. 7 March 2016. Retrieved 12 September 2019.
- ^ "EPIC 201912552". Open Exoplanet Catalogue. 7 March 2016. Retrieved 12 September 2019.
Coordinates: 
11h 30m 14.518s, +07° 35′ 18.257″
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