Kepler-42c

Short description: Sub-Earth orbiting Kepler-42

Kepler-42 c

Sizes of Earth-like planets, including Mars, Kepler-42c (KOI-961.02), Kepler-20e, Kepler-20f and Earth.

Discovery
Discovered by| Philip S. Muirhead et al.[1]
Discovery site| In space
Discovery date| January 11, 2012

Detection method

| Transit (Kepler)
Orbital characteristics

Semi-major axis

| ~ 0.0060 AU
Orbital period| 0.45328731±5*10−8[2] d
Inclination| 85.06+0.15−0.16
Star| Kepler-42
Physical characteristics
Mean radius| 0.73±0.03[2] R⊕
Physics| 720 ± 73[1]

Kepler-42 c, previously KOI-961.02 then KOI-961 c, is an exoplanet orbiting Kepler-42, a star located about 131 light-years (40 pc) from the Solar System, in the constellation of Cygnus. A planetary system of at least three exoplanets with sizes between Mars and Venus has been detected around this red dwarf on January 11, 2012, by the method of transits with the help of the space telescope Kepler.

Kepler-42 c is a planet with a radius 0.73 times that of Earth. It orbits its star in a little less than 11 hours at about 0.006 AU of its host star and has an average equilibrium temperature of about 445 °C (833 °F). Due to the temperature, it is not suitable for life.

It is tidally locked in a synchronous rotation. Thus, it makes one complete rotation each time it completes an orbit. As a result, there is an eternal day side and a permanent night side.

## References

1. ↑ 1.0 1.1 Philip S. Muirhead, John Asher Johnson, Kevin Apps, Joshua A. Carter, Timothy D. Morton, Daniel C. Fabrycky, J. Sebastian Pineda, Michael Bottom, Barbara Rojas-Ayala, Everett Schlawin, Katherine Hamren, Kevin R. Covey, Justin R. Crepp, Keivan G. Stassun, Joshua Pepper, Leslie Hebb, Evan N. Kirby, Andrew W. Howard, Howard T. Isaacson, Geoffrey W. Marcy, David Levitan, Tanio Diaz-Santos, Lee Armus, James P. Lloyd, « Characterizing the Cool KOIs III. KOI-961: A Small Star with Large Proper Motion and Three Small Planets » accepté pour publication dans The Astrophysical Journal – arXiv:1201.2189v1.
2. ↑ 2.0 2.1 Mann, Andrew W.; Dupuy, Trent; Muirhead, Philip S.; Johnson, Marshall C.; Liu, Michael C.; Ansdell, Megan; Dalba, Paul A.; Swift, Jonathan J. et al. (2017), "The Gold Standard: Accurate Stellar and Planetary Parameters for EightKeplerM Dwarf Systems Enabled by Parallaxes", The Astronomical Journal 153 (6): 267, doi:10.3847/1538-3881/aa7140, Bibcode: 2017AJ....153..267M

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