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Exoplanet TOI-1634 b is the biggest known with close orbit to its star

Astronomers led by Teruyuki Hirano discovered two new rocky exoplanets orbiting very close to their stars. TOI-1634 b and TOI-1685 b both orbit red dwarf stars with about half the mass of Sun. One year on these planets lasts less than a day, making them ultra short period exoplanets. TOI-1634 b is the biggest known exoplanet to have this short year.

missions icon TESS 18. 4. 2018 Ongoing

Rocky exoplanet (illustration)

According to data from telescopes TESS and Subaru neither TOI-1634 b nor TOI-1685 b have their primary hydrogen atmospheres. It is possible that they have secondary atmospheres, that consist of gases coming from their surfaces.


Star TOI-1634 (TESS Object of Interest) is a red dwarf 115 light years away. It has about half the mass of the Sun. Exoplanet TOI-1634 b has 5 times more mass than Earth and 1.79 its radius. It is the biggest known exoplanet with year lasting less than a 24 hours.


Another red dwarf TOI-1685 lies 123 light years away from the Sun. The exoplanet in this system has even shorter year, but is a little smaller - its radius is 70 % bigger than Earth's. There might be another planet in this system, but it hasn't been confirmed yet.
Related stars in our catalogue
part of star image
part of star image
TOI-1685 122.8 ly
2 exoplanet
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TOI-1634 115.2 ly
1 exoplanet
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