CoRoT-21b

CoRoT-21b is a transiting exoplanet reportedly found by the CoRoT space telescope in 2011. Planetary parameters were published in 2012.^[3]

CoRoT-21b

Discovery
Discovered by	CoRoT space telescope
Detection method	Transit
Orbital characteristics
Semi-major axis	0.0417 AU (6,240,000 km)[1]
Eccentricity	0
Orbital period (sidereal)	2.72474[1] d
Inclination	86.8[1]
Star	CoRoT-21
Physical characteristics
Mean radius	1.3 RJ
Mass	2.26MJ
Temperature	1857 K[2]

It is an extremely hot Jupiter-like planet with an orbital period of 2.72 earth days. It has a mass equivalent to 2.26 M_J, a radius of 1.3 R_J, and a density of 1.37 g/cm³.

The planet is experiencing extreme tidal forces, forcing its orbit to decay within 800 million years from now.^[4]

Host star

CoRoT-21b orbits CoRoT-21 in the constellation of Monoceros. It is an F-type subgiant star (spectral type F8IV) with an effective temperature of 6,200 K (5,930 °C; 10,700 °F), a mass of 1.29 M_☉, a radius of 1.945 R_☉, and a near-solar metallicity. It has an estimated age between 3.6 and 4.6 Gyr.