K2-21b
| Exoplanet | List of exoplanets
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|---|---|---|---|---|---|---|
| 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
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