Gliese 581b
Astronomical discovery
Gliese 581b or Gl 581b is an exoplanet orbiting within the Gliese 581 system. It is the first planet discovered of three confirmed in the system so far, and the second in order from the star. Wikipedia
Discovered: August 22, 2005
Discoverers: Michel Mayor, Stéphane Udry, and Didier Queloz
Mass: ≥15.20+0.22; −0.27 M🜨
Orbital period (sidereal): 5.368±0.001 d
Semi-amplitude: 12.35+0.18; −0.20 m/s
Star: Gliese 581