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Gliese 581c / ˈ ɡ l iː z ə / (Gl 581c or GJ 581c) is an exoplanet orbiting within the Gliese 581 system. It is the second planet discovered in the system and the third in order from the star. With a mass about 6.8 times that of the Earth, it is classified as a super-Earth (a category of planets with masses greater than Earth's up to ten ...
Gliese 581 (/ ˈ ɡ l iː z ə /) is a ... to be 2.2 R 🜨, making it a super-Earth. Its orbital period is thought to be 66.87 days long, with a semi-major axis of 0 ...
It is the second super-Earth for which astronomers have determined the mass and radius, giving vital clues about its structure. The radius of GJ 1214 b can be inferred from the amount of dimming seen when the planet crosses in front of its parent star as viewed from Earth, yielding a radius of 2.742 +0.050 −0.053 R 🜨. [3]
For Gliese 876 d, calculations range from 9,200 km (1.4 Earth radii) for a rocky planet and very large iron core to 12,500 km (2.0 Earth radii) for a watery and icy planet. Within this range of radii the super-Earth Gliese 876 d would have a surface gravity between 1.9g and 3.3g (19 and 32 m/s 2). However, this planet is not known to transit ...
Gliese 12 b is not the first Earth-like exoplanet to have been discovered, but Nasa said there are only a handful of worlds like it that warrant a closer look.
GJ 1214 (sometimes Gliese 1214) is a dim M4.5 [4] red dwarf star in the constellation Ophiuchus with an apparent magnitude of 14.7. [3] It is located at a distance of 47.8 light-years (14.7 parsecs ) from Earth . [ 12 ]
Gliese 667 Cc is a super-Earth, an exoplanet with a mass and radius greater than that of Earth, but smaller than that of the giant planets Uranus and Neptune. It is heavier than Earth with a minimum mass of about 3.7 Earth masses. [5] The equilibrium temperature of Gliese 667 Cc is estimated to be 277.4 K (4.3 °C; 39.6 °F). [6]
Dynamical simulations of the Gliese 581 system assuming that the orbits of the three planets are coplanar show that the system becomes unstable if the masses of the planets exceed 1.6–2 times the minimum values. Using earlier minimum mass values for Gliese 581d, this implies an upper mass limit for Gliese 581d of 13.8 Earth masses. [12]