Trappist-1 g
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Exoplanet Trappist-1 g |
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| Fictional representation of Trappist-1g | |
| Constellation | Aquarius |
| Position equinox : J2000.0 |
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| Right ascension | 23h 06m 29.0s |
| declination | -05 ° 02 ′ 29 ″ |
| Orbit data | |
| Central star | Trappist-1 |
| Major semi-axis | 0.0451 (± 0.0014) AU |
| eccentricity | 0.0 |
| Period of circulation | 12.35294 (± 0.00012) days |
| Further data | |
| radius | 0.1005 (± 0.0037) radii of Jupiter |
| Dimensions | 0.00422 ± 0.0028 masses of Jupiter |
| distance | 12.1 ± 0.4 pc |
| history | |
| Date of discovery | 02/22/2017 |
Trappist-1 g , also known as 2MASS J23062928-0502285 g , is a presumably rocky exoplanet orbiting the dwarf star Trappist-1 in the habitable zone . It is located about 39 light years (12 parsecs ) from Earth in the constellation Aquarius .
Planet in the Trappist 1 system
Trappist-1 g is the sixth of seven planets in its solar system, counted from its star . It is one of the four planets around Trappist-1 that were found with the Spitzer Space Telescope using the transit method . Presumably all planets of the Trappist-1 system orbit the dwarf star in a bound rotation , that is, one side of the planets is continuously illuminated by the star (perpetual day, warm) and one side never (perpetual night, cold), in between there is an annular one Medium temperature zone.
Trappist-1 g orbits its star with an orbit duration of about 12.353 days and an orbit radius of about 0.045 that of the earth's orbit.
properties
Trappist-1 g is an earth-like planet . Its radius is about 1.13 earth radii and its mass about 1.34 earth masses . Thus it has a density comparable to that of the earth, about 5.13 g / cm³, and a surface acceleration of about 10.03 m / s² (102% of the value of the earth). Its calculated equilibrium temperature is 198.6 K (-75 ° C).
Habitability
The exoplanet lies on the outer edge of the habitable zone, but on its side facing the sun, assuming an Earth-like atmosphere, temperatures are likely to prevail. It has an Earth Similarity Index of 0.58.
So far nothing is known about the chemical composition and possible atmosphere of the planet.
See also
literature
- Michaël Gillon, Emmanuël Jehin, Susan M. Lederer, Laetitia Delrez, Julien de Wit, Artem Burdanov, Valérie Van Grootel, Adam J. Burgasser, Amaury HMJ Triaud, Cyrielle Opitom, Brice-Olivier Demory, Devendra K. Sahu, Daniella Bardalez Gagliuffi , Pierre Magain, Didier Queloz: Temperate Earth-sized planets transiting a nearby ultracool dwarf star . In: Nature . 2016, doi : 10.1038 / nature17448 ( eso.org [PDF]).
Individual evidence
- ^ HEC: Data of Potentially Habitable Worlds - Planetary Habitability Laboratory @ UPR Arecibo. In: upr.edu. phl.upr.edu, accessed March 14, 2017 .