TOI-6255 b: A Year In 5.7 Hours
Terrestrial around TOI-6255
It is 1.08 times Earth's radius, closest in size to Earth, and 1.4 times Earth's mass. A year there lasts 5.7 hours. The host star TOI-6255 runs at 3421 K with 0.35 times the Sun's mass.
5.7hours: one full year, start to finish
Radius
1.08 Earth radii
Mass
1.4 Earth masses
One year
5.7 hours
Host star
TOI-6255 at 3421 K
Distance
66 light-years
Starlight blocked
0.071% at each transit
Known and unknown, as the archive has it
A radius from transit photometry. Yes.
A mass. Yes.
A density, which decides rock or gas. No.
A semi-major axis. No.
A measured temperature rather than a derived one. No.
An eccentricity, so the orbit shape is known. Yes.
What a crossing measures
Block a known fraction of a known star and you have measured a width.
The size came from a crossing, the mass did not. That pairing is uncommon and it is what lets anyone say whether this is rock or gas.
Found by Transiting Exoplanet Survey Satellite (TESS) in 2024. 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.
