![TOI-201 c: 24.0 Grams Per Cubic Centimetre](https://cdn.slatesource.com/1/1/5/115376cf-c7b1-40b4-a777-c1a22a00cb01.webp)

# TOI-201 c: 24.0 Grams Per Cubic Centimetre

- [Made in Slatesource](https://slatesource.com/@steph/toi-201-c-24-0-grams-per-cubic-centimetre)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Gas giant around TOI-201

It is 0.93 times Jupiter's radius, closest in size to Jupiter, and 4990.0 times Earth's mass, at 24.00 g/cm3, denser than Earth. A year there lasts 7.9 years, on an orbit 11.3 times Mercury's distance from the Sun. Its equilibrium temperature is 155 K (derived from the star rather than measured), colder than anywhere on Earth. The host star TOI-201 runs at 6423 K with 1.32 times the Sun's mass.

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

journey·3 Planets

# TOI-201 from the inside out

Orbit

/

Planet

"super-Earth, 1227 K.

"gas giant, 589 K.

"gas giant, 155 K.

Radius

10.40 Earth radii

Mass

4990.0 Earth masses

Equilibrium temperature

155 K (derived)

One year

7.9 years

Orbit radius

4.3700 AU

Host star

TOI-201 at 6423 K

Distance

371 light-years

🔭🪐📅01.01.2021 – 01.01.2026

01.01.2021TOI-201 b

01.01.2021

01.01.2025TOI-201 c

01.01.2025

01.01.2026TOI-201 d

01.01.2026

The habitability checklist, honestly scored

0%

Within the zone where liquid water could persist. No.

Dense enough to be rock rather than gas, at 24.00 g/cm3. Yes.

A measured mass, not just a radius. Yes.

A measured temperature rather than one derived from the star. No.

Any detection of an atmosphere. Not recorded in the archive.

The archive lists no measured equilibrium temperature for this planet. The 155 K quoted here is derived from the star's output and the orbital distance, assuming a third of the light is reflected. It is an estimate from two numbers, not an observation.

Found by Transiting Exoplanet Survey Satellite (TESS) in 2025. 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.

TOI-201 has 3 known planets. A crowded system is worth more than the sum of its planets: the timing of each transit constrains the others.

Its orbit is noticeably elliptical, eccentricity 0.65, so the starlight it receives changes substantially over one year.

# Half the temperatures quoted for exoplanets are calculated from the star, not \\

measured at the planet. Should a page like this show them at all, or leave the field blank?

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[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-201%20c?utm_source=slatesource)