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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 red dwarf star of spectral type M3V which hosts a planetary system, 20.5 light-years (6.3 parsecs) away from Earth in the constellation Libra. Its estimated mass is about a third of that of the Sun, and it is the 101st closest known star system to the Sun. [15] Gliese 581 is one of the oldest, least active ...
Gliese 581 d looks an even better candidate. The orbital period was originally estimated at 83 days and has now been revised to 66 days. [24] This was announced along with another new world, Gliese 581 e, which is next to twice the mass of Earth but too close to its sun for liquid water. In May 2011, a new study suggested that the planet might ...
Gliese 581c, [46] Gliese 581g, [47] [48] Gliese 581b, [49] and Gliese 581e [50] may be tidally locked to their parent star Gliese 581. Gliese 581d is almost certainly captured either into the 2:1 or the 3:2 spin–orbit resonance with the same star. [51] All planets in the TRAPPIST-1 system are likely to be tidally locked. [52] [53]
Called Proxima b, the planet is 1.3 times the mass of Earth and has an orbital period of roughly 11.2 Earth days. [10] However, Proxima Centauri's classification as a red dwarf casts doubts on the habitability of any exoplanets in its orbit due to low stellar flux, high probability of tidal locking , small circumstellar habitable zones and high ...
A G-type star slightly more massive than the Sun. [69] Planet g remains unconfirmed. [69] HD 82943: Hydra: 09 h 34 m 50.74 s: −12° 07′ 46.4″ 6.54: 90: F9V Fe+0.5 [70] 1.175: 5874: 3.08: 3: Planets b and c are in a 2:1 orbital resonance. [71] Planet b orbits in the habitable zone, but it and planet c are massive enough to be brown dwarfs.
The association said that “one key question” taken up by the roundtable was whether ARIA was a temporary symptom of the new drug — much the way nausea and hair loss are side effects of ...
The table on the Gliese 581 page gives a very high eccentricity of 0.3 for c's orbit; the page for Gliese 581 c gives eccentricity 0. Eccentricity 0.3 for a semimajor axis 0x 0.073 AU puts perihelion at about 0.039 AU if I got my math right; this is inside the orbit of Gliese 581 b, so I'm guessing that Gliese 581 c is more right than this page.