![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Planet_Gliese_176_b.png/640px-Planet_Gliese_176_b.png&w=640&q=50)
Gliese 176 b
Super-Earth exoplanet orbiting Gliese 176 / From Wikipedia, the free encyclopedia
Gliese 176 b is a super-Earth exoplanet approximately 31 light years away in the constellation of Taurus. This planet orbits very close to its parent red dwarf star Gliese 176 (also called "HD 285968").
Discovery | |
---|---|
Discovered by | Endl,[1] Forveille et al.[2] |
Discovery date | September 7, 2007 |
radial velocity | |
Orbital characteristics | |
0.066±0.001 AU | |
Eccentricity | 0.148+0.249 −0.036 |
8.776+0.001 −0.002 d | |
2450839.760 | |
150.6+42.2 −104.5 | |
Semi-amplitude | 4.49+1.00 −0.23 |
Star | Gliese 176 |
Physical characteristics | |
Temperature | ~450[2] |
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Planet_Gliese_176_b.png/320px-Planet_Gliese_176_b.png)
The initial announcement confused the planetary periodicity with the stellar periodicity of 40 days, thus giving a 10.24 day period for a 25 Earth-mass planet.[1] Subsequent readings filtered out the star's rotation, giving a more accurate reading of the planet's orbit and minimum mass.
The planet orbits inside the inner magnetosphere of its star. The quoted temperature of 450 K is a "thermal equilibrium" temperature.[2]
It is projected to be dominated by a rocky core, but the true mass is unknown. If the orbit is oriented such that we are viewing it at a nearly face-on angle, the planet may be significantly more massive than the lower limit. If so, it may have attracted a gas envelope like Uranus or Gliese 436 b.[2]