artist rendition
Artist's concept

HAT-P-21 b is a gas giant exoplanet that orbits a G-type star. Its mass is 4.063 Jupiter, it takes 4.1 days to complete one orbit of its star, and is 0.0494 AU from its star. Its discovery was announced in 2010.

PLANET TYPE
Gas Giant
DISCOVERY DATE
2010
MASS
4.063 Jupiter
PLANET RADIUS
1.024 x Jupiter
ORBITAL RADIUS
0.0494 AU
ORBITAL PERIOD
4.1 days
ECCENTRICITY
0.228
DETECTION METHOD
Transit