Ross 780 Gliese 876
- X -6
- Y -13
- Z 5
- Variable of BY Dra type
- Infra-Red source
- High proper-motion Star
- Variable Star
Gliese 876 is a red dwarf approximately 15 light-years away from Earth in the constellation of Aquarius.
It is the third-closest-known star to the Sun confirmed to possess a planetary system (after Proxima Centauri and Gliese 674 ) and the closest such system known to consist of multiple planets. As of 2011, four extrasolar planets have been found to orbit the star.
The planetary system is also notable for the orbital properties of its planets. It is the only known system of orbital companions to exhibit a triple conjunction in the rare phenomenon of Laplace resonance (a type of resonance first noted in Jupiter's inner three Galilean moons). It is also the first extrasolar system around a normal star with measured coplanarity.
Two of the middle planets are located in the system's habitable zone; however, they are giant planets believed to be analogous to Jupiter.This article uses material from the Wikipedia article "Gliese 876", which is released under the Creative Commons Attribution-Share-Alike License 3.0.