K2-21b

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K2-21b
Exoplanet List of exoplanets
Size comparison
Earth K2-21b
The Earth seen from Apollo 17.jpg Exoplanet
Parent star
Star K2-21
Right ascension (α) 22h41m12.88s [1]
Declination (δ) -14d29m20.4s[1]
Distance 212±19.56 ly
(65±6[1] pc)
Mass (m) 0.64±0.11[1] M
Radius (r) 0.60±0.10[1] R
Temperature (T) 4043±375[1] K
Metallicity [Fe/H] -0.11±0.13[1]
Age >1[1] Gyr
Physical characteristics
Mass (m) null[1] M
Radius (r) 1.59+0.42
−0.44
[1] R
Density (ρ) 2.7+3.7
−1.6
[1] g cm−3
Temperature (T) 500 K (227 °C; 440 °F)
Orbital elements
Semi-major axis (a) 0.0731[1] AU
Eccentricity (e) null[1]
Orbital period (P) 9.32414[1] d
Inclination (i) 88.3+1.3
−1.1
[1]°
Discovery information
Discovery date 2015
Discoverer(s)
Discovery method Transit
Discovery site Kepler Space Observatory
Discovery status Confirmed

K2-21b also known as EPIC 206011691 b is an exoplanet orbiting K2-21 a red dwarf, every 9.3 days 212 ly away.[1][2] It has a density of 2.7g/cm3 indicating that it is not a rocky planet.[1] However, there error is rather large, with a possible density between 1.1 and 6.4 g/cm3, so the nature of its composition is still uncertain.

References

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 Lua error in package.lua at line 80: module 'strict' not found.
  2. http://exoplanet.eu/catalog/epic-206011691_b/

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