Kepler-20b

Kepler-20b
Exoplanet List of exoplanets
Parent star
Star Kepler-20 (KOI-070)
Constellation Lyra
Right ascension (α) 19h 10m 47.5235s[1]
Declination (δ) +42° 20′ 19.299″[1]
Apparent magnitude (mV) 12.51
Distance929±6[1] ly
(285±2[1] pc)
Mass (m) 0.912±0.035 M☉
Radius (r) 0.944+0.06
−0.095 R☉
Temperature (T) 5466±93 K
Metallicity [Fe/H] 0.02±0.04
Age 8.8+4.7
−2.7 Gyr
Physical characteristics
Mass(m)9.7+1.41
−1.44 [2] M⊕
Radius(r)1.868+0.066
−0.034 R⊕
Density(ρ)8.2+2.0
−2.7 g cm−3
Temperature (T) 1014
Orbital elements
Semi-major axis(a) 0.04537 AU
Eccentricity (e) <0.32
Orbital period(P) 3.6961219 d
Inclination (i) 86.50+0.36
−0.31°
Discovery information
Discovery date 20 December 2011
Discoverer(s) Kepler team
Discovery method Transit (Kepler Mission)
Other detection methods Radial velocity
Discovery status Conference announcement

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.

References

  1. 1 2 3 4 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 Data Release 2 Vizier catalog entry
  2. ↑ https://arxiv.org/abs/1608.06836 A 1.9 Earth radius rocky planet and the discovery of a non-transiting planet in the Kepler-20 system


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