Gliese 436 b
Hot Neptune exoplanet orbiting Gliese 436 / From Wikipedia, the free encyclopedia
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Gliese 436 b /ˈɡliːzə/ (sometimes called GJ 436 b,[7] formally named Awohali[2]) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436.[1] 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.
Quick Facts Discovery, Discovered by ...
Discovery[1] | |
---|---|
Discovered by | Butler, Vogt, Marcy et al. |
Discovery site | California, USA |
Discovery date | August 31, 2004 |
Radial velocity, Transit | |
Designations | |
Awohali[2] | |
Orbital characteristics | |
0.028±0.01 AU | |
Eccentricity | 0.152+0.009 −0.008[3] |
2.643904±0.000005[4] d | |
Inclination | 85.8+0.21 −0.25[4] |
2451552.077[3] | |
325.8+5.5 −5.7[3] | |
Semi-amplitude | 17.38±0.17[3] |
Star | Noquisi |
Physical characteristics | |
Mean radius | 4.327 ± 0.183[5][6] R🜨 |
Mass | 21.36+0.20 −0.21[3] ME |
Mean density | 1.51 g/cm3 (0.055 lb/cu in) |
1.18 g | |
Temperature | 712 K (439 °C; 822 °F)[5] |
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In December 2013, NASA reported that clouds may have been detected in the atmosphere of GJ 436 b.[8][9][10][11]