Gliese 581 b

Gliese 581b is an extrasolar planet orbiting within the Gliese 581 system. Discovered on August 22, 2005,It is the first planet discovered of three confirmed in the system so far, and the second in order from the star. It is estimated to be less massive and smaller than Neptune, but due to radial velocity the respective mass and radius is unknown, and is considered as a Mini-Neptune.
Category:Exoplanets
Category:Gliese 581 System