 Size comparison of Gliese 581 b with Neptune (Based on selected hypothetical modeled compositions)[a] | |
| Discovery[1] | |
|---|---|
| Discovered by | X. Bonfils, T. Forveille, X. Delfosse, S. Udry, M. Mayor, C. Perrier, F. Bouchy, F. Pepe, D. Queloz, J.-L. Bertaux |
| Discovery date | August 22, 2005 announced November 30, 2005 |
| Doppler spectroscopy | |
| Orbital characteristics[2] | |
| 0.0399±0.0005 AU | |
| Eccentricity | 0.0342+0.009 −0.010 |
| 5.3686±0.0001 d | |
| Inclination | 47°+15° −13° |
| 2454751.76 ± 0.01[3] | |
| 54°+13° −14° | |
| Semi-amplitude | 12.3±0.1 m/s |
| Star | Gliese 581 |
| Physical characteristics[2] | |
| Mass | 20.5+6.2 −3.5 M🜨 |
Gliese 581b or Gl 581b is an exoplanet orbiting within the Gliese 581 system, located 20.5 light-years (6.3 parsecs) away from Earth in the Libra constellation. It is the first planet discovered of three confirmed in the system so far, and the second in order from the star.[2]
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