HR 8799 b
Astronomical discovery
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HR 8799 b is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 4 and 7 Jupiter masses and a radius from 10 to 30% larger... Wikipedia
Discovered: November 13, 2008
Mean radius: 1.2 ± 0.1 RJ
Discovered by: Marois et al
Discovery site: W. M. Keck Observatory Headquarters and Gemini North Telescope
Detection method: Direct imaging
Mass: 5+2; −1 MJ
Semi-major axis: ~ 68 AU