Gliese 436 b
Size comparison of Awohali with Neptune | |
| Discovery | |
|---|---|
| Discovered by | Butler, Vogt, Marcy et al. |
| Discovery site | California, USA |
| Discovery date | August 31, 2004 |
| Radial velocity, Transit | |
| Designations | |
| Awohali | |
| Orbital characteristics | |
| 0.028±0.001 AU | |
| Eccentricity | 0.152+0.009 −0.008 |
| 2.64389803(26) d | |
| Inclination | 86.858°+0.049° −0.052° |
| 2451552.077 | |
| 325.8°+5.5° −5.7° | |
| Semi-amplitude | 17.38±0.17 m/s |
| Star | Gliese 436 |
| Physical characteristics | |
| 4.10±0.16 R🜨 | |
| Mass | 21.36+0.20 −0.21 M🜨 |
Mean density | 1.71 g/cm3 |
| 1.27 g | |
| Albedo | ≤0.66 (Bond) |
| Temperature | 662.8±5.0 K (389.6 °C; 733.4 °F, dayside) |
Gliese 436 b /ˈɡliːzə/ (sometimes called GJ 436 b, formally named Awohali) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436 (Noquisi), the only known planet in its system. It was the first hot Neptune discovered with certainty (in 2007) and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.
In December 2013, NASA reported that clouds may have been detected in the atmosphere of GJ 436 b.