Gliese 581 (HO Librae) je hvězda v souhvězdí Vah, která je vzdálena od Země asi 22 světelných let a je červeným trpaslíkem spektrálního typu M3V.Má hmotnost třetiny našeho Slunce a je 89. nejbližší známou hvězdou. Gliese 581 F is the furthest planet from its star and a large terrestrial planet, known as a super Earth. Este é o quinto planeta descoberto do sistema e o sexto a contar da sua estrela. Gliese 581 c is a exoplanet that orbits the red dwarf star Gliese 581.It is located about 20 light years away in the Libra.It is about six times as massive as Earth, and circles its star about 11 million kilometers from it (the Earth is 150 million kilometers away from the sun).It takes it 13 days to circle the star once. [67], At the outer edge of the system is a massive debris disk containing more comets than the Solar System. The astronomers agree that four of the planets are real, but some think there are two more planets. The candidate planet Gliese 581g attracted more attention: nicknamed Zarmina's World by one of its discoverers,[30] the predicted mass of Gliese 581g was between 3 and 4 Earth-masses, with an orbital period of 37 days. Retrieved 9 October 2008. The star has almost a third (31 +/- 2 percent) of Sol's mass, as small as 29 percent of its diameter (Chabrier and Baraffe, 2000; Pasinetti-Fracassini et al, 2001; and Johnson and Wright, 1983), and a bit more than one percent (around 0.0135) of its bolometric luminosity (Vogt et al, 2010; Bonfils et al, 2005, in pdf). It resides in the Gliese 581 system, which at 20 light-years from Earth is relatively close to our planet (in celestial terms). This makes it the 89th closest known star to the Sun. Gliese 581 is een zwakke, met het blote oog niet zichtbare ster in het sterrenbeeld Weegschaal (Libra). In 1994 Edward Weis concluded that Gliese 581, like half the 43 dwarf M stars he studied over a multi-year period, showed long term variability (and page 1137, Fig 1 shows Gliese 581 had magnitude 10.58 in 1982 and between 10.57 and 10.56 from 1985 to 1990). If the planet has a dense atmosphere, it may be able to circulate heat. Astronomers Claim Discovery of Earth-like Planet, Position of Gliese 581 marked on local space, Photo of Constellation Libra with Gliese 581, Artist conceptions of planets of Gliese 581, Speculation about geology/geochemistry of Gliese 581c, Computer models suggest planetary and extrasolar planet atmospheres – A gas, gas, gas, Earth-like planet found that may support life, Gliese 581 – The "Red Dwarf" and implications for its "earthlike" planet Gliese 581c, Communication with extraterrestrial intelligence, Gauss's Pythagorean right triangle proposal, Potential cultural impact of extraterrestrial contact, https://en.wikipedia.org/w/index.php?title=Gliese_581&oldid=998341426, Planetary systems with three confirmed planets, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 4 January 2021, at 23:16. Gliese 581f is the sixth planet in the Gliese 581 star system. Gliese 581 is an M-class red dwarf star that is not far from the Earth.It is 22 light years away from the Solar system. After subtracting the signals of the previously known Gliese 581 planets, b, c, d and e, the signals of two additional planets were apparent: a 445-day signal from a newly recognized outermost planet designated f, … Gliese 581g was claimed to be detected by astronomers of the Lick–Carnegie Exoplanet Survey. [19], The name Gliese 581 refers to the catalog number from the 1957 survey Gliese Catalogue of Nearby Stars of 965 stars located within 20 parsecs of the Earth. By comparison, Earth has an average surface temperature of 15 °C (59 °F)—while Mars has an average surface temperatures of about −63 °C (−81 °F). Родительская звезда Звезда Gliese 581 … Gliese 581d was estimated to receive about 30% of the intensity of light the Earth receives from the Sun. [48], Gliese 581e is the innermost planet and, with a minimum mass of 1.7 Earth masses, is the least massive of the three. The system is known to consist of at least three planets discovered using the radial velocity method, along with a debris disk. The planet is thought to be tidally locked to its star. [40], Bayesian analysis found no clear evidence for a fifth planetary signal in the combined HIRES/HARPS data set,[41][42] though other studies led to the conclusion that the data did support the existence of planet g, albeit with strong degeneracies in the parameters as a result of the first eccentric harmonic with the outer planet Gliese 581d. The signal will reach Gliese 581 in early 2029. I have no idea how and why the Gliese 581 planets wound up with their presently observed properties and configuration. As Sirius or Procyon van Bergen star about 20 light years from Solar! 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