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Kepler-42 c
Exoplanet List of exoplanets
Comparing the size of Earth, Mars, and exoplanets of Kepler-20 and Kepler-42.jpg
Sizes of Earth-like planets, including Mars, Kepler-42c (KOI-961.02), Kepler-20e, Kepler-20f and Earth.
Parent star
Star Kepler-42
Constellation Cygnus
Right ascension (α) 19h 28m 52.56s
Declination (δ) +44° 37′ 09.6″
Apparent magnitude (mV) 10.64
Distance 727 ly
(223 pc)
Spectral type M
Orbital elements
Semi-major axis (a) ~ 0.0060[1] AU
Orbital period (P) 0.45328509 ± 9.7×10−7[2] d
Inclination (i) 85.06+0.15
Time of transit (Tt) 2454966.86952 ± 4.2×10−4 JD
Physical characteristics
Radius (r) 0.73 ± 0.20[2] R
Stellar flux (F) 67
Temperature (T) 720 ± 73[2]
Discovery information
Discovery date January 11, 2012
Discoverer(s) Philip S. Muirhead et al.[2]
Discovery method Transit (Kepler)
Other detection methods Transit-timing variations
Discovery site In space
Discovery status Published
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

Kepler-42 c, previously KOI-961.02 then KOI-961 c, is an exoplanet orbiting Kepler-42, a star located about 126 light-years (39 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).

Notes and references[edit]

  1. ^ – 12 janvier 2012 « Planet: KOI-961c ».
  2. ^ a b c d 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 JournalarXiv:1201.2189v1.