Terrestrial planet · TOI-201

TOI-201 d

ExoplanetsDiscovered 2026

Scientific overview

TOI-201 d is a terrestrial planet orbiting TOI-201, completing an orbit every 6 days, about 371 light-years from Earth. It was discovered in 2026 using the transit method.

Host star

TOI-201

Spectral type

Temperature

6,423 K

Mass

1.32 M☉

Planetary system — TOI-201 system

View the TOI-201 system (3 known planets).

Planet	Class	Radius (R⊕)	Period (d)	Distance (ly)
TOI-201 dTransit · 2026	Terrestrial planet	1.39	5.8489	371
TOI-201 bTransit · 2021	Gas giant	11.4	52.9786	371
TOI-201 cTransit Timing Variations · 2025	Gas giant	10.4	2890	371

Discovery and detection

Detection method

Transit Method

Discovery year

2026

Discovered at

TESS

Knowledge connections

OrbitsTOI-201
Member of systemTOI-201 system
Discovered by methodTransit Method
Discovered by missionTESS
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: TOI-201
Discovery method: Transit Method
Discovery year: 2026
Orbital period: 5.8489 d
Semi-major axis: 0.0698 AU
Eccentricity: 0.3
Radius: 1.39 R⊕
Mass: 5.8 M⊕
Density: 11.91 g/cm³ · derived
Equilibrium temp.: 1237 K
Insolation: 389.67 S⊕
Distance: 371 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 density11.91 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 5.8 M⊕ · NASA
- radiusEarth = 1.39 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.