Terrestrial planet · GJ 357

GJ 357 b

ExoplanetsDiscovered 2019

Scientific overview

GJ 357 b is a terrestrial planet orbiting GJ 357, completing an orbit every 4 days, about 31 light-years from Earth. It was discovered in 2019 using the transit method.

Host star

GJ 357

Spectral type

M2.5 V

Temperature

3,505 K

Mass

0.342 M☉

Planetary system — GJ 357 system

View the GJ 357 system (3 known planets).

Planet	Class	Radius (R⊕)	Period (d)	Distance (ly)
GJ 357 bTransit · 2019	Terrestrial planet	1.2	3.9306	31
GJ 357 cRadial Velocity · 2019	Super-Earth	1.66	9.1247	31
GJ 357 dRadial Velocity · 2019	Super-Earth	2.34	55.661	31

Discovery and detection

Detection method

Transit Method

Discovery year

2019

Discovered at

TESS

Knowledge connections

OrbitsGJ 357
Member of systemGJ 357 system
Discovered by methodTransit Method
Discovered by missionTESS
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: GJ 357
Discovery method: Transit Method
Discovery year: 2019
Orbital period: 3.9306 d
Semi-major axis: 0.036 AU
Radius: 1.2 R⊕
Mass: 1.83 M⊕
Density: 5.84 g/cm³ · derived
Equilibrium temp.: 518 K
Insolation: 12.6 S⊕
Distance: 31 ly

Density is derived from the archive mass and radius via ρ = M / (4⁄3·π·r³); all other values are catalogued measurements.

Derived values

Computed from source-backed inputs via standard formulae — not observations. Every input and constant is traced below.

Bulk density5.84 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 1.83 M⊕ · NASA
- radiusEarth = 1.2 R⊕ · NASA
Assumptions: M⊕ = 5.972e+24 kg, R⊕ = 6371000 m (IAU 2015 B3 nominal); Assumes a uniform sphere.
Limitations: Withheld above 30 g/cm³ (inconsistent mass/radius inputs).; Archive mass/radius carry no propagated uncertainty here.
Uncertainty: not propagated (inputs carry no catalogued uncertainty)
Computed as of 2026-06-29.

Quality & authority

Partial

Unreviewed

Description: Complete
Source coverage: Partial
Relationship coverage: Complete
Review coverage: None
Citation coverage: None
Image coverage: Not applicable

Data from the NASA Exoplanet Archive. See source quality.