![WD 1856+534 b: 4386.1 Earth Masses](https://cdn.slatesource.com/e/3/2/e32835e4-e157-4099-84cc-de5d79f21722.webp)

# WD 1856+534 b: 4386.1 Earth Masses

- [Made in Slatesource](https://slatesource.com/@steph/wd-1856-534-b-4386-1-earth-masses)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Gas giant around WD 1856+534

It is 0.93 times Jupiter's radius, closest in size to Jupiter, and 4386.1 times Earth's mass. A year there lasts 1.41 days, on an orbit 19 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 163 K, colder than anywhere on Earth. The host star WD 1856+534 runs at 4710 K with 0.52 times the Sun's mass.

Radius

10.40 Earth radii

Mass

4386.1 Earth masses

Equilibrium temperature

163 K (measured)

One year

1.41 days

Orbit radius

0.0204 AU

Host star

WD 1856+534 at 4710 K

Distance

81 light-years

Starlight blocked

5285.612% at each transit

Where this planet stands on each testable criterion

0%

Within the zone where liquid water could persist. No.

A measured mass, not just a radius. Yes.

A measured temperature rather than one derived from the star. Yes.

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

What you get from the shadow

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 2020. 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.

[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/WD%201856+534%20b?utm_source=slatesource)