![TOI-2431 b: A Year In 5.4 Hours](https://cdn.slatesource.com/b/6/d/b6dcefe0-7280-46c2-955f-7ae0d00308e3.webp)

# TOI-2431 b: A Year In 5.4 Hours

- [Made in Slatesource](https://slatesource.com/@steph/toi-2431-b-a-year-in-5-4-hours)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Super-earth around TOI-2431

It is 1.53 times Earth's radius, closest in size to Earth, and 6.2 times Earth's mass, at 9.40 g/cm3, denser than Earth. A year there lasts 5.4 hours, on an orbit 61 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 2063 K, hot enough to vaporise rock. The host star TOI-2431 runs at 4109 K with 0.66 times the Sun's mass.

**2063** K: hot enough to vaporise rock on the dayside

Radius

1.53 Earth radii

Mass

6.2 Earth masses

Equilibrium temperature

2063 K (measured)

One year

5.4 hours

Orbit radius

0.0063 AU

Host star

TOI-2431 at 4109 K

Distance

118 light-years

Starlight blocked

0.047% at each transit

What the dip tells you

Block a known fraction of a known star and you have measured a width.

Two independent measurements sit behind this page: a dip in starlight for the size, and something else entirely for the mass. Together they make a density.

Found by Transiting Exoplanet Survey Satellite (TESS) in 2026. TESS scans most of the sky in 27-day stretches, so it favours bright nearby stars and short orbits over the faint distant ones Kepler specialised in.

[Every parameter ever published for TOI-2431 b, at the NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-2431%20b?utm_source=slatesource)