TRAPPIST-1g

TRAPPIST-1g
Artist's impression of TRAPPIST-1g. (February 2018)
Discovery[1]
Discovered byMichaël Gillon et al.
Discovery siteSpitzer Space Telescope
Discovery date22 February 2017
Transit
Orbital characteristics[2]
0.04683±0.00040 AU
Eccentricity0.00208±0.00058[3]
12.352446±0.000054 d
Inclination89.742°±0.012°
191.34°±13.83°[3]
StarTRAPPIST-1[4]
Physical characteristics[2]
1.129+0.015
−0.013
 R🜨
Mass1.321±0.038 M🜨
Mean density
5.042+0.136
−0.158
 g/cm3
1.035±0.026 g
10.15±0.25 m/s2
TemperatureTeq: 197.3±1.9 K (−75.8 °C; −104.5 °F)[5]

TRAPPIST-1g, also designated as 2MASS J23062928-0502285 g and K2-112 g, is an exoplanet orbiting around the ultra-cool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation Aquarius. It was one of four new exoplanets to be discovered orbiting the star in 2017 using observations from the Spitzer Space Telescope.[6] The exoplanet is within the optimistic habitable zone of its host star.[7] It was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.

The second most distant known planet in its system, TRAPPIST-1g is a planet somewhat larger than Earth and with a similar density, meaning it is likely a rocky planet.[2]

  1. ^ Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Agol2021 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Grimm2018 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference vangrootel2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Ducrot2020 was invoked but never defined (see the help page).
  6. ^ "Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1". SpaceRef. 22 February 2017. Retrieved 11 February 2017.
  7. ^ "NASA telescope reveals largest batch of Earth-size, habitable-zone planets around single star". Exoplanet Exploration: Planets Beyond our Solar System (Press release). Retrieved 22 February 2017.