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Gliese 581 g
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Gliese 581 g
Extrasolar planet
List of extrasolar planets|-
Parent star
Star
Gliese 581
Constellation
Libra
Right ascension
(a)
15h 19m 26s
Declination
(d)
-07° 43' 20?
Apparent magnitude
(mV)
10.55
Distance
20.3 ± 0.3 ly
(6.2 ± 0.1 pc)
Spectral type
M3V
Mass
(m)
0.31 M?
Radius
(r)
0.29 R?
Temperature
(T)
3480 ± 48 K
Metallicity
-0.33 ± 0.12
Age
7 – 11 Gyr
Orbital elements
Epoch JD 2451409.762
Semimajor axis
(a)
0.14601 ± 0.00014 AU
Eccentricity
(e)
0
Orbital period
(P)
36.562 ± 0.052 d
(0.100 y)
(877 h)
Mean anomaly
(M)
271 ± 48°
Semi-amplitude
(K)
1.29 ± 0.19 m/s
Physical characteristics
Minimum mass
(m sin i)
3.1 ± 0.4 M?
Discovery information
Discovery date
September 29, 2010
Discoverer(s)
Steven S. Vogt et al.
Discovery method
Radial Velocity
Discovery site
Keck Observatory, Hawaii
Discovery status
Unconfirmed
Other designations
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD
data
The W. M. Keck Observatory at twilight, where Gliese 581 g was discovered
Gliese 581 g /'gli?z?/, also known as Gl 581 g or GJ 581 g, sometimes unofficially named Zarmina, is an unconfirmed (and disputed) exoplanet claimed to orbit the red dwarf Gliese 581, about 20 light-years from Earth in the constellation of Libra. It is the sixth planet purportedly discovered orbiting the star. The discovery was announced by the Lick-Carnegie Exoplanet Survey in late September 2010, after a decade of observation. However, the ESO/HARPS survey team was not able to confirm that the planet exists.Gliese 581 g has attracted attention because it is near the middle of the habitable zone of its parent star. That means it could sustain liquid water on its surface and could potentially host life similar to that on Earth (the planet is expected to have temperatures around -37 to -12 °C). If it is a rocky planet, favorable atmospheric conditions could permit the presence of liquid water, a necessity for all known life, on its surface. With a mass 3.1 to 4.3 times Earth's, Gliese 581 g is considered a super-Earth and is the planet closest in size to Earth known in a habitable zone, after Kepler-186f. This makes it one of the most Earth-like Goldilocks planet found outside the Solar System and one of the exoplanet with the greatest recognized potential for harboring life.The supposed detection of Gliese 581 g after such a short period of searching and at such close proximity has led some astronomers to hypothesize that the proportion of stars with habitable planets may be greater than ten percent.
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