artist rendition
Artist's concept

HD 209458 b is a gas giant exoplanet that orbits an unknown-type star. Its mass is Unknown and it takes 3.5 days to complete one orbit of its star. Its discovery was announced in 1999.

PLANET TYPE
Gas Giant
DISCOVERY DATE
1999
MASS
Unknown
PLANET RADIUS
1.32 x Jupiter
ORBITAL RADIUS
Unknown
ORBITAL PERIOD
3.5 days
ECCENTRICITY
Unknown
DETECTION METHOD
Radial Velocity