K2-66b
| Discovery[1] | |
|---|---|
| Discovered by | K2 |
| Discovery date | 2017 |
| Transit | |
| Orbital characteristics[1] | |
| 0.05983±0.00072 AU | |
| 5.06963±0.00081 d | |
| Inclination | 86.6+4.4 −2.4° |
| Star | K2-66 |
| Physical characteristics[1] | |
| 2.49 R🜨 | |
| Mass | 0.06702 MJ |
Mean density | 7.6 g/cm3 |
K2-66b is a confirmed[2][3] mega-Earth orbiting the subgiant K2-66, about 520 parsecs (1,700 ly) from Earth in the direction of Aquarius.[1] It is an extremely hot and dense planet heavier than Neptune, but with only about half its radius.[4]
Planet properties
[edit]Mass, radius, and temperature
[edit]K2-66b is a mega-Earth with radius 2.49 R🜨 and mass 21.3 ME.[5] The planet's temperature is highly variable due to the variability of its host star, and is currently estimated at 1,372 K (1,099 °C; 2,010 °F).[2]
Orbit
[edit]The planet orbits every 5.07 days at 0.06 AU.[1] It orbits within a "photoevaporation desert", where orbiting exoplanets should be very uncommon.[4][6] K2-66b's orbit is nearly circular.[2][7]
Star
[edit]The star,[8] K2-66 is a G1 sub-giant in Aquarius.[5] It has a sun-like temperature of 5887 K,[1][2] which corresponds to its spectral class and is very close to that of the rotationally variable[9] star Kepler-130.[10][11][12] It has a radius of 1.67 R☉ and a mass of 1.11 M☉.[2] Its metallicity is −0.047, and its apparent magnitude is 11.71.[1]
See also
[edit]- Kepler
- Mega-Earth
- K2-56b
- Sub-giant
- G-type main sequence star
- Density
- List of exoplanets discovered in 2017
- List of exoplanets discovered in 2016
- Lava planet
- Stellar evolution
References
[edit]- ^ a b c d e f g "The Extrasolar Planet Encyclopaedia — K2-66 b". Extrasolar Planets Encyclopaedia. Retrieved 30 January 2021.
- ^ a b c d e "Open Exoplanet Catalogue - K2-66 b". openexoplanetcatalogue.com. Retrieved 26 June 2021.
- ^ "K2-66 - Universe Guide". www.universeguide.com. Retrieved 7 July 2021.
- ^ a b Sinukoff, Evan; Howard, Andrew W.; Petigura, Erik A.; Fulton, Benjamin J.; Crossfield, Ian J. M.; Isaacson, Howard; Gonzales, Erica; Crepp, Justin R.; Brewer, John M.; Hirsch, Lea; Weiss, Lauren M.; Ciardi, David R.; Schlieder, Joshua E.; Benneke, Bjoern; Christiansen, Jessie L.; Dressing, Courtney D.; Hansen, Brad M. S.; Knutson, Heather A.; Kosiarek, Molly; Livingston, John H.; Greene, Thomas P.; Rogers, Leslie A.; Lépine, Sébastien (2017). "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities". The Astronomical Journal. 153 (6): 271. arXiv:1705.03491. Bibcode:2017AJ....153..271S. doi:10.3847/1538-3881/aa725f. S2CID 31572527.
- ^ a b Futó, P. (2018). Kepler-145b and K2-66b: A Kepler- and a K2-Mega-Earth with Different Compositional Characteristics. Lunar and Planetary Science Conference. No. 2083. p. 1224. Bibcode:2018LPI....49.1224F.
- ^ Sinukoff, Evan; et al. (31 May 2017). "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities". The Astronomical Journal. 153 (6): 271. arXiv:1705.03491. Bibcode:2017AJ....153..271S. doi:10.3847/1538-3881/aa725f.
- ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 25 June 2021.
- ^ "K2-66". sim-id. Retrieved 7 July 2021.
((cite web)): Check|url=value (help)[permanent dead link] - ^ "Kepler-130". sim-id. Retrieved 7 July 2021.
((cite web)): Check|url=value (help)[permanent dead link] - ^ "Kepler-130 | NASA Exoplanet Archive".
- ^ "The Extrasolar Planet Encyclopaedia — Kepler-130 d". Extrasolar Planets Encyclopaedia. Retrieved 28 June 2021.
- ^ "Open Exoplanet Catalogue - Kepler-130 d". www.openexoplanetcatalogue.com. Retrieved 28 June 2021.
External links
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