![K2-216 b: 8.2 Grams Per Cubic Centimetre](https://cdn.slatesource.com/8/0/6/8064ad9a-5ffc-4de5-a6b8-b58c67e6e6fd.webp)

# K2-216 b: 8.2 Grams Per Cubic Centimetre

- [Made in Slatesource](https://slatesource.com/@steph/k2-216-b-8-2-grams-per-cubic-centimetre)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Super-earth around K2-216

It is 1.75 times Earth's radius, closest in size to Earth, and 8.0 times Earth's mass, at 8.20 g/cm3, denser than Earth. A year there lasts 2.17 days, on an orbit 14 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 1103 K, hot enough to melt lead. The host star K2-216 runs at 4503 K with 0.70 times the Sun's mass.

Radius

1.75 Earth radii

Mass

8.0 Earth masses

Equilibrium temperature

1103 K (measured)

One year

2.17 days

Orbit radius

0.0280 AU

Host star

K2-216 at 4503 K

Distance

377 light-years

Starlight blocked

0.050% at each transit

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

What the dip tells you

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

Found by K2 in 2018, the second life of the Kepler spacecraft after two of its reaction wheels failed and it could no longer hold a fixed stare.

The size came from a crossing, the mass did not. That pairing is uncommon and it is what lets anyone say whether this is rock or gas.

[NASA Exoplanet Archive: the full record for K2-216 b](https://exoplanetarchive.ipac.caltech.edu/overview/K2-216%20b?utm_source=slatesource)