TRAPPIST-1h

TRAPPIST-1h
	Artist's impression of TRAPPIST-1h.
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	0.06189±0.00053 AU
Eccentricity	0.00567±0.00121
Orbital period (sidereal)	18.772866±0.000214 d
Inclination	89.805°±0.013°
Argument of periastron	338.92°±9.66°
Star	TRAPPIST-1
Physical characteristics
Mean radius	0.755±0.014 R🜨
Mass	0.326±0.020 M🜨
Mean density	4.147+0.322; −0.302 g/cm3
Surface gravity	0.570±0.038 g; 5.58±0.37 m/s2
Temperature	Teq: 171.7±1.7 K (−101.5 °C; −150.6 °F)

TRAPPIST-1h, also designated as 2MASS J23062928-0502285 h, 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]^[7] In the following years, more studies were able to refine its physical parameters.

The outermost known planet in its system, it is roughly one third the mass of Earth, and about 76% as large. Its relatively low density indicates that it is likely water-rich, like several other planets in the system.^[8]

^ Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).
^ ^a ^b 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 vangrootel2017 was invoked but never defined (see the help page).
^ Cite error: The named reference Ducrot2020 was invoked but never defined (see the help page).
^ "Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1". SpaceRef. 22 February 2017. Retrieved 11 February 2017.
^ "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.
^ Cite error: The named reference OceanPlanets was invoked but never defined (see the help page).

[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).

[vangrootel2017-4] Cite error: The named reference vangrootel2017 was invoked but never defined (see the help page).

[Ducrot2020-5] 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.

[OceanPlanets-8] Cite error: The named reference OceanPlanets was invoked but never defined (see the help page).

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Discovery^[1]
Artist's impression of TRAPPIST-1h.
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	0.06189±0.00053 AU
Eccentricity	0.00567±0.00121^[3]
Orbital period (sidereal)	18.772866±0.000214 d
Inclination	89.805°±0.013°
Argument of periastron	338.92°±9.66°^[3]
Star	TRAPPIST-1^[4]
Physical characteristics^[2]
Mean radius	0.755±0.014 R_🜨
Mass	0.326±0.020 M_🜨
Mean density	4.147+0.322 −0.302 g/cm³
Surface gravity	0.570±0.038 g 5.58±0.37 m/s²
Temperature	T_eq: 171.7±1.7 K (−101.5 °C; −150.6 °F)^[5]