artist rendition
Artist's concept

Kepler-21 b is a Super Earth exoplanet that orbits a F-type star. Its mass is 5.08 Earths, it takes 2.8 days to complete one orbit of its star, and is 0.042717 AU from its star. Its discovery was announced in 2012.

PLANET TYPE
Super-earth
DISCOVERY DATE
2012
MASS
5.08 Earths
PLANET RADIUS
1.639 x Earth
ORBITAL RADIUS
0.042717 AU
ORBITAL PERIOD
2.8 days
ECCENTRICITY
0.02
DETECTION METHOD
Transit