K2-138b

K2-138b
Exoplanet List of exoplanets
Parent star
Star K2-138
Constellation Aquarius
Right ascension (α) 23h 15m 47.77s[1]
Declination (δ) −10° 50′ 58.91″[1]
Apparent magnitude (mV) 12.21[1]
Distance597 ± 55[1] ly
(183 ± 17[1] pc)
Spectral type K1 V[1]
Mass (m) 0.93 ± 0.06[1] M☉
Radius (r) 0.86 ± 0.08[1] R☉
Temperature (T) 5378 ± 60[1] K
Metallicity [Fe/H] +0.16 ± 0.04[1]
Orbital elements
Epoch BJD 2457773.3170[1]
Semi-major axis(a) 0.03380[1] AU
Eccentricity (e) <0.403[1]
Orbital period(P) 2.35322[1] d
Inclination (i) 86.9[1]°
Physical characteristics
Radius(r)1.57[1] R⊕
Stellar flux(F⊙)486[1] ⊕
Discovery information
Discovery date January 11, 2018
Discoverer(s) Jessie L. Christiansen et al.[1]
Discovery method Transit method
Discovery site Kepler
Discovery status Confirmed

K2-138b is a potentially rocky Super-Earth exoplanet orbiting every 2 days around a K1V star. The planet, along with the four others in the system, was found by citizen scientists of the Exoplanet Explorers project on Zooniverse. It was the final planet found in the system and was officially announced on January 8, 2018.

K2-138b is the smallest planet of K2-138 with a radius of 1.57 R⊕, meaning it could be rocky. It orbits its host star every 2.35 days at a distance of 0.0338 AU. At this proximity, the planet is likely very hot and receives 486 times the stellar flux as Earth.[1][2]

The K2-138 system is unique for being the first exoplanet system discovered entirely by citizen scientists.[3][4][5]

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Christiansen, Jessie L.; Crossfield, Ian J. M.; Barentsen, Geert; Lintott, Chris J.; Barclay, Thomas; Simmons, Brooke D.; Petigura, Erik; Schlieder, Joshua E.; Dressing, Courtney D.; Vanderburg, Andrew; Allen, Campbel; McMaster, Adam; Miller, Grant; Veldthuis, Martin; Allen, Sarah; Wolfenbarger, Zach; Cox, Brian; Zemiro, Julia; Howard, Andrew W.; Livingston, John; Sinukoff, Evan; Catron, Timothy; Grey, Andrew; Kusch, Joshua J. E.; Terentev, Ivan; Vales, Martin; Kristiansen, Martti H. (11 January 2018). "The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists". The Astronomical Journal. 155 (2): 57. arXiv:1801.03874. Bibcode:2018AJ....155...57C. doi:10.3847/1538-3881/aa9be0.
  2. ↑ "K2-138 b". exoplanetarchive.ipac.caltech.edu.
  3. ↑ "Five-Exoplanet System Discovered Thanks to Citizen Scientists".
  4. ↑ "Citizen Scientists Discover Five-Planet System - Caltech".
  5. ↑ Daley, Jason. "Citizen Scientists Discover an Unusual Five-Planet Solar System".
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