GJ 581 b is a Neptune-like exoplanet that orbits a K-type star. Its mass is 15.8 Earths, 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
15.8 Earths
PLANET RADIUS
0.366 x Jupiter
(estimate)
ORBITAL RADIUS
0.04061 AU
ORBITAL PERIOD
5.4 days
ECCENTRICITY
0.0
DETECTION METHOD