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K2-21b

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K2-21b
Discovery[1]
Discovery siteKepler Space Observatory
Discovery date2015
Transit
Orbital characteristics
0.0731 AU (10,940,000 km)
Eccentricitynull[2]
9.32414[2] d
Inclination88.3+1.3
−1.1[2]
StarK2-21
Physical characteristics
1.59+0.42
−0.44[2] R🜨
Massnull[2] ME
Mean density
2.7+3.7
−1.6 g cm−3
Temperature500 K (227 °C; 440 °F)

K2-21b, also known as EPIC 206011691 b is an exoplanet orbiting K2-21, a red dwarf 273.5 light-years away from Earth,[3] with a period of 9.3 days.[2][4] It has a density of 2.7g/cm3, indicating that it is not a rocky planet.[2] The margin of error is however quite large, with a possible density between 1.1 and 6.4 g/cm3. Due to this error margin, the true nature of its composition is uncertain.

References

  1. ^ Petigura, Erik A.; et al. (2015). "Two Transiting Earth-Size Planets Near Resonance Orbiting a Nearby Cool Star". The Astrophysical Journal. 811 (2): 102. arXiv:1507.08256. Bibcode:2015ApJ...811..102P. doi:10.1088/0004-637X/811/2/102.
  2. ^ a b c d e f g "K2-21 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-14.
  3. ^ 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.
  4. ^ http://exoplanet.eu/catalog/epic-206011691_b/


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