TRAPPIST-1 h
Orbiting TRAPPIST-1
TRAPPIST-1 h is an exoplanet orbiting the star TRAPPIST-1, discovered in 2017 using the Transit method. It is a Earth-sized world.
Radius
0.76
Earth radii
Mass
0.33
Earth masses
Orbital Period
18.8
days
What these measurements mean
These comparisons use the reported catalog values. They are interpretations and calculations, not additional observations.
- Size in perspective
- At the reported radius, a spherical model gives about 0.43 times Earth's volume. This is the radius ratio cubed, not a mass comparison. The radius alone cannot establish whether this world has a rocky surface or a thick gaseous envelope.
- A year on this world
- A 365.25-day Earth year spans about 19.5 of these orbits. This comparison uses the reported orbital period. It does not measure the planet's rotation or the length of its day.
- What the mass can tell you
- Mass describes how much material the planet contains. Inspect the published uncertainty and reference before combining it with a radius to estimate density. Catalog values can come from different studies.
Radius (Earth radii)
0.76
Mass (Earth masses)
0.33
Measured
Equilibrium Temperature
Unknown
Parameter source: Agol et al. 2021
Orbital Period
18.773+0.000−0.000days
Semi-Major Axis
0.0619+0.0005−0.0005au
Planet Mass (Earth masses)
0.33+0.02−0.02
Planet Mass (Jupiter masses)
0.0010+0.0001−0.0001
Distance from Earth
Unknown
Spectral Type
Unknown
Temperature
2566 K
Mass (Solar)
0.09 M☉
Radius (Solar)
0.12 R☉
Luminosity
-3.26 log L☉
Planets in System
7
Stars in System
1
Coordinates (RA, Dec)
346.6264°, -5.0435°
Discovery Method
Transit
Discovery Year
2017
Source ID: TRAPPIST-1 h
TRAPPIST-1 h orbits TRAPPIST-1 and was reported in 2017 and was detected with the Transit method.
Published measurements list a radius of 0.76 Earth radii, a mass of 0.33 Earth masses, and an orbital period of 18.77 days.
Catalog data places 7 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open TRAPPIST-1More planets in this system