![Kepler-48 c: 14.6 Earth Masses](https://cdn.slatesource.com/5/a/9/5a9957d6-3e5a-44d5-8a3f-4622bed1afbd.webp)

# Kepler-48 c: 14.6 Earth Masses

- [Made in Slatesource](https://slatesource.com/@steph/kepler-48-c-14-6-earth-masses)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Mini-neptune around Kepler-48

It is 2.71 times Earth's radius, closest in size to Neptune, and 14.6 times Earth's mass, at 4.01 g/cm3, less dense than Earth. A year there lasts 9.67 days. The host star Kepler-48 runs at 5194 K with 0.88 times the Sun's mass.

Radius

2.71 Earth radii

Mass

14.6 Earth masses

One year

9.67 days

Host star

Kepler-48 at 5194 K

Distance

1000 light-years

Starlight blocked

0.078% at each transit

🔭🪐📅01.01.2012 – 01.01.2014

01.01.2012Kepler-48 b, Kepler-48 c

01.01.2012

01.01.2014Kepler-48 d

01.01.2014

What the archive holds on this planet

0%

A radius from transit photometry. Yes.

A weight, not just a width. Yes.

A density, which decides rock or gas. Yes.

A semi-major axis. No.

A measured temperature rather than a derived one. No.

An eccentricity, so we know if the orbit is a circle. No.

What the transit gives

The depth of the dip is the ratio of the two discs, so the radius follows.

Found by Kepler in 2012. 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.

Size from the shadow, mass from elsewhere. Most transiting planets never get the second half, and without it composition stays a guess.

Kepler-48 has 5 known planets. Planets in company tug on each other, and those tugs are measurable, which is how masses get pinned down without a wobble.

[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-48%20c?utm_source=slatesource)