artist rendition
Artist's concept

GJ 581 b is a Neptune-like exoplanet that orbits an unknown-type star. Its mass is at least 15.8Earths, it takes 5.4 days to complete one orbit of its star, and is 0.04061 AU from its star. Its discovery was announced in 2005.

PLANET TYPE
Neptune-like
DISCOVERY DATE
2005
MASS
at least 15.8Earths
PLANET RADIUS
Unknown
ORBITAL RADIUS
0.04061 AU
ORBITAL PERIOD
5.4 days
ECCENTRICITY
0.0
DETECTION METHOD
Radial Velocity