Kepler-20b
Kepler-20b is an exoplanet orbiting Kepler-20. It is classified as a Super-Earth, as it has a radius and mass greater than that of Earth. At about 1.87 R⊕, it would most likely be a Mini-Neptune, but its high mass of 9.7 M⊕ implies that it is an iron-rich rocky world. Along with the other four planets in the system, Kepler-20b was announced on 20 December 2011.
| Discovery | |
|---|---|
| Discovered by | Kepler team |
| Discovery date | 20 December 2011 |
| Transit (Kepler Mission) | |
| Orbital characteristics | |
| 0.04537 AU | |
| Eccentricity | <0.32 |
| 3.6961219 d | |
| Inclination | 86.50+0.36 −0.31 |
| Star | Kepler-20 (KOI-070) |
| Physical characteristics | |
Mean radius | 1.868+0.066 −0.034 R⊕ |
| Mass | 9.7+1.41 −1.44 [1] M⊕ |
Mean density | 8.2+2.0 −2.7 g cm−3 |
| Temperature | 1014 |
References
- Buchhave, Lars A.; Dressing, Courtney D.; Dumusque, Xavier; Rice, Ken; Vanderburg, Andrew; Mortier, Annelies; Lopez-Morales, Mercedes; Lopez, Eric; Lundkvist, Mia S.; Kjeldsen, Hans; Affer, Laura; Bonomo, Aldo S.; Charbonneau, David; Cameron, Andrew Collier; Cosentino, Rosario; Figueira, Pedro; Fiorenzano, Aldo F. M.; Harutyunyan, Avet; Haywood, Raphaëlle D.; Johnson, John Asher; Latham, David W.; Lovis, Christophe; Malavolta, Luca; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Motalebi, Fatemeh; Nascimbeni, Valerio; Pepe, Francesco; et al. (2016). "A 1.9 Earth Radius Rocky Planet and the Discovery of a Non-Transiting Planet in the Kepler-20 System". The Astronomical Journal. 152 (6): 160. arXiv:1608.06836. Bibcode:2016AJ....152..160B. doi:10.3847/0004-6256/152/6/160. S2CID 216077870.
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