K2-21c
| Exoplanet | List of exoplanets
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|---|---|---|---|---|---|---|
| Parent star | ||||||
| Star | K2-21 | |||||
| Constellation | Aquarius[1] | |||||
| Right ascension | (α) | 22h 41m 12.8862s[2] | ||||
| Declination | (δ) | −14° 29′ 20.349″[2] | ||||
| Distance | 273.5±0.9[2] ly (83.8±0.3[2] pc) | |||||
| Mass | (m) | 0.64±0.11[3] M☉ | ||||
| Radius | (r) | 0.60±0.10[3] R☉ | ||||
| Temperature | (T) | 4043±375[3] K | ||||
| Metallicity | [Fe/H] | -0.11±0.13[3] | ||||
| Age | >1[3] Gyr | |||||
| Physical characteristics | ||||||
| Mass | (m) | null[3] M⊕ | ||||
| Radius | (r) | 1.92+0.54 −0.52[3] R⊕ | ||||
| Density | (ρ) | 5.40+5.40 −3.50[3] g cm−3 | ||||
| Temperature | (T) | 420 K (147 °C; 296 °F) | ||||
| Orbital elements | ||||||
| Semi-major axis | (a) | 0.1026[3] AU | ||||
| Eccentricity | (e) | null[3] | ||||
| Orbital period | (P) | 15.50120[3] d | ||||
| Inclination | (i) | 89.08+0.63 −0.75[3]° | ||||
| Discovery information | ||||||
| Discovery date | 2015 | |||||
| Discoverer(s) | ||||||
| Discovery method | Transit | |||||
| Discovery site | Kepler Space Observatory | |||||
| Discovery status | Confirmed | |||||
K2-21c also known as EPIC 206011691 c is an exoplanet orbiting K2-21 a red dwarf, every 15.5 days 273.5 ly away.[3][4][2] It has a density of 5.40g/cm3 indicating that it could be rocky planet or has heavily compressed volatiles.[3]
References
- ↑ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
- 1 2 3 4 5 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.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 "K2-21 c CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-14.
- ↑ http://exoplanet.eu/catalog/epic-206011691_c/
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