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At a Glance

Celestial Size Comparison

Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.

Choose objects to compare

Choose at least 2 and no more than 4 celestial objects.

2/ 4

TRAPPIST-1 System objects

8 objects
TRAPPIST-1Star
TRAPPIST-1 bPlanet
TRAPPIST-1 cPlanet
TRAPPIST-1 dPlanet
TRAPPIST-1 ePlanet
TRAPPIST-1 fPlanet
TRAPPIST-1 gPlanet
TRAPPIST-1 hPlanet

Size Comparison

Shows objects at a scale close to their actual size ratio.

TRAPPIST-1165,854.88 km
TRAPPIST-1 e11,735.704 km

Environment Comparison

Compare the size and environment of each celestial object.

MeasurementTRAPPIST-1TRAPPIST-1 e
Mean radius
82,927.4 km5,867.9 km
Diameter
≈ 165,854.9 km≈ 11,735.7 km
Spherical approximate volume
≈ 2.389E15 km3≈ 846,303,357,187 km3
Mass
1.786E29 kg4.133E24 kg
Mean density
≈ 74,750.137 kg/m³4,901.605 kg/m³
Surface gravity
≈ 1,733.024 m/s²≈ 8.011 m/s²
Escape velocity
≈ 536.1 km/s≈ 9.7 km/s
Rotation period
NaNNaN
Orbital period
NaN6.101 d
Mean temperature
2,566 K (2,292.9°C)249.7 K (-23.4°C)
Surface pressure
NaNNaN
Orbital semi-major axis
NaN4,375,737.7 km

Mean radius

TRAPPIST-1
82,927.4 km
TRAPPIST-1 e
5,867.9 km

Diameter

TRAPPIST-1
≈ 165,854.9 km
TRAPPIST-1 e
≈ 11,735.7 km

Spherical approximate volume

TRAPPIST-1
≈ 2.389E15 km3
TRAPPIST-1 e
≈ 846,303,357,187 km3

Mass

TRAPPIST-1
1.786E29 kg
TRAPPIST-1 e
4.133E24 kg

Mean density

TRAPPIST-1
≈ 74,750.137 kg/m³
TRAPPIST-1 e
4,901.605 kg/m³

Surface gravity

TRAPPIST-1
≈ 1,733.024 m/s²
TRAPPIST-1 e
≈ 8.011 m/s²

Escape velocity

TRAPPIST-1
≈ 536.1 km/s
TRAPPIST-1 e
≈ 9.7 km/s

Rotation period

TRAPPIST-1
NaN
TRAPPIST-1 e
NaN

Orbital period

TRAPPIST-1
NaN
TRAPPIST-1 e
6.101 d

Mean temperature

TRAPPIST-1
2,566 K (2,292.9°C)
TRAPPIST-1 e
249.7 K (-23.4°C)

Surface pressure

TRAPPIST-1
NaN
TRAPPIST-1 e
NaN

Orbital semi-major axis

TRAPPIST-1
NaN
TRAPPIST-1 e
4,375,737.7 km
Please Note

This comparison is based on the most reliable observational data available. Celestial information may change with new research and observations, so please treat it as a general guide rather than a definitive source.