![Kepler-131 c: 0.84 Times Earth](https://cdn.slatesource.com/4/9/c/49c10742-2eb8-4a24-bf24-24e31cbe2565.webp)

# Kepler-131 c: 0.84 Times Earth

- [Made in Slatesource](https://slatesource.com/@steph/kepler-131-c-0-84-times-earth)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Terrestrial around Kepler-131

It is 0.84 times Earth's radius, closest in size to Venus, and 8.2 times Earth's mass, at 77.70 g/cm3, denser than Earth. A year there lasts 25.52 days. The host star Kepler-131 runs at 5685 K with 1.02 times the Sun's mass.

**77.7** g/cm3: denser than iron at Earth surface pressure

Radius

0.84 Earth radii

Mass

8.2 Earth masses

One year

25.52 days

Host star

Kepler-131 at 5685 K

Distance

746 light-years

Starlight blocked

0.006% at each transit

What the archive holds on this planet

0%

A size. Yes.

A mass. Yes.

A density, the one clue to composition. Yes.

How far out it orbits. No.

An observed temperature. No.

An eccentricity, so the orbit shape is known. No.

What a crossing measures

The fraction of starlight blocked sets the radius against the star's.

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 Kepler in 2014. Kepler watched a single field continuously, so it found the planets that come round often. A world with a long year simply never repeated within the mission.

Kepler-131 has 2 known planets. Systems like this are the ones where architecture can be studied instead of guessed at.

[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-131%20c?utm_source=slatesource)