Terrestrial planet · TOI-270

TOI-270 b

ExoplanetsDiscovered 2019

Scientific overview

TOI-270 b is a terrestrial planet orbiting TOI-270, completing an orbit every 3 days, about 73 light-years from Earth. It was discovered in 2019 using the transit method.

Host star

TOI-270

Spectral type

M3 V

Temperature

3,506 K

Mass

0.386 M☉

Planetary system — TOI-270 system

View the TOI-270 system (3 known planets).

Planet	Class	Radius (R⊕)	Period (d)	Distance (ly)
TOI-270 bTransit · 2019	Terrestrial planet	1.28	3.3599	73
TOI-270 cTransit · 2019	Super-Earth	2.33	5.6605	73
TOI-270 dTransit · 2019	Super-Earth	2	11.3819	73

Discovery and detection

Detection method

Transit Method

Discovery year

2019

Discovered at

TESS

Knowledge connections

OrbitsTOI-270
Member of systemTOI-270 system
Discovered by methodTransit Method
Discovered by missionTESS
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: TOI-270
Discovery method: Transit Method
Discovery year: 2019
Orbital period: 3.3599 d
Semi-major axis: 0.032 AU
Eccentricity: 0.017
Radius: 1.28 R⊕
Mass: 1.48 M⊕
Density: 3.89 g/cm³ · derived
Equilibrium temp.: 600 K
Insolation: 131.79 S⊕
Distance: 73 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 density3.89 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 1.48 M⊕ · NASA
- radiusEarth = 1.28 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.