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Kepler-20b is an exoplanet orbiting Kepler-20 in a system 922 light years from Earth.[2] It is classified as a Super-Earth, as it has a radius and mass greater than that of Earth. At about 1.87 REarth, it would most likely be a Mini-Neptune, but its high mass of 9.7 MEarth 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.

Kepler-20b
Discovery
Discovered byKepler team
Discovery date20 December 2011
Detection method
Transit (Kepler Mission)
Orbital characteristics
Semi-major axis
0.04537 AU
Eccentricity<0.32
Orbital period (sidereal)
3.6961219 d
Inclination86.50+0.36
−0.31
StarKepler-20 (KOI-070)
Physical characteristics
Mean radius
1.868+0.066
−0.034 REarth
Mass9.7+1.41
−1.44 [1] MEarth
Mean density
8.2+2.0
−2.7 g cm−3
Temperature1,014 K (741 °C; 1,366 °F)

    References


    1. 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.
    2. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2021-10-05.


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    - [en] Kepler-20b

    [ru] Kepler-20 b

    Kepler-20 b (KOI 70.02, KOI-70 b, KIC 6850504 b, 2MASS J19104752+4220194 b[2]) — первая из пяти экзопланет у звезды Kepler-20 в созвездии Лиры[3][4].


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