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Metal planet: newly discovered exoplanet GJ 367 b is as dense as iron

Astronomers discovered new nearby exoplanet. It orbits star Gliese 367, which is 31 light years away from the Sun. The new exoplanet has mass 0.55 Earth masses and 72 % Earth radius, and is one of the densest exoplanets known to this day. According to a new study the average density of GJ 367 b is similar to iron.

missions icon TESS 18. 4. 2018 Ongoing

Exoplanet orbiting red dwarf star

Physical characteristics

Space telescope TESS first discovered the planet in 2019 with transit method, which uncovered its size. It took astronomers some time to confirm its existence and find out its other characteristics like mass. With these data they could calculate the density and speculate on it structure and origin.

Proximity to the star

GJ 367 b orbits its star every 7.7 hours, placing it very close to it. The temperatures on its surface may reach as much as 1 600 °C. Astronomers didn't find any atmosphere, if it had one, it was blown away by the intense radiation of the star.


The exoplanet was probably born further away from its star. It may have been a Neptune-like planet, with dense core and signifiant atmosphere. Once the exoplanet migrated closer to the star, the atmosphere was blown away leaving inly small dense core the size of planet Mars.
Related stars in our catalogue
part of star image
part of star image
Gliese 367 30.7 ly
1 exoplanet
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