TRAPPIST-1f

TRAPPIST-1f
	Artist's impression of TRAPPIST-1f. (February 2018)
Discovery
Discovered by	Michaël Gillon et al.
Discovery site	Spitzer Space Telescope
Discovery date	22 February 2017
Detection method	Transit
Orbital characteristics
Semi-major axis	0.03849±0.00033 AU
Eccentricity	0.01007±0.00068
Orbital period (sidereal)	9.207540±0.000032 d
Inclination	89.740°±0.019°
Argument of periastron	368.81°±3.11°
Star	TRAPPIST-1
Physical characteristics
Mean radius	1.045+0.013; −0.012 R🜨
Mass	1.039±0.031 M🜨
Mean density	5.009+0.138; −0.158 g/cm3
Surface gravity	0.951±0.024 g; 9.32±0.24 m/s2
Temperature	Teq: 217.7±2.1 K (−55.5 °C; −67.8 °F)

TRAPPIST-1f, also designated as 2MASS J23062928-0502285 f, is an exoplanet, likely rocky,^[2] orbiting within the habitable zone^[5] around the ultracool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation of Aquarius. The exoplanet 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.

It was one of four new exoplanets to be discovered orbiting the star in 2017 using observations from the Spitzer Space Telescope.^[1]

The planet is likely tidally locked, and has been depicted as an eyeball planet in artistic impressions by NASA.

^ ^a ^b Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Agol2021 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Grimm2018 was invoked but never defined (see the help page).
^ Cite error: The named reference Ducrot2020 was invoked but never defined (see the help page).
^ "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.

[Gillon2017-1] Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).

[Agol2021-2] Cite error: The named reference Agol2021 was invoked but never defined (see the help page).

[Grimm2018-3] Cite error: The named reference Grimm2018 was invoked but never defined (see the help page).

[Ducrot2020-4] Cite error: The named reference Ducrot2020 was invoked but never defined (see the help page).

[5] "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.

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Discovery^[1]
Artist's impression of TRAPPIST-1f. (February 2018)
Discovered by	Michaël Gillon et al.
Discovery site	Spitzer Space Telescope
Discovery date	22 February 2017
Detection method	Transit
Orbital characteristics^[2]
Semi-major axis	0.03849±0.00033 AU
Eccentricity	0.01007±0.00068^[3]
Orbital period (sidereal)	9.207540±0.000032 d
Inclination	89.740°±0.019°
Argument of periastron	368.81°±3.11°^[3]
Star	TRAPPIST-1
Physical characteristics^[2]
Mean radius	1.045+0.013 −0.012 R_🜨
Mass	1.039±0.031 M_🜨
Mean density	5.009+0.138 −0.158 g/cm³
Surface gravity	0.951±0.024 g 9.32±0.24 m/s²
Temperature	T_eq: 217.7±2.1 K (−55.5 °C; −67.8 °F)^[4]