WD 1856+534 b: 4386.1 Earth Masses
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
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.
