Kepler-42c

Kepler-42 c

Exoplanet		List of exoplanets
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)	19^h 28^m 52.56^s
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 −0.16°
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 Encyclopaedia		data
SIMBAD		data
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

1. Exoplanet.eu – 12 janvier 2012 « Planet: KOI-961c ».
2. 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.