Confirmed exoplanet · Database record + computed analysis
TOI-500 b
A confirmed world orbiting TOI-500, 154.6 light-years away.
An Earth-sized world
1.17 times Earth's radius, squarely in the terrestrial size range.
The orbit
Its year lasts about 13.2 hours, making it an ultra-short-period planet skimming its star. Orbiting this tightly around a cool star, it is very likely tidally locked: one hemisphere in permanent day, the other in permanent night.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,344 °C. Hot enough to melt copper; any surface would glow. It receives 1,138.0 times the starlight Earth gets.
Its sun
Its star is an orange K-type (4,440 K), K6 V: cooler and longer-lived than the Sun, a class some astronomers consider ideal for habitability. It shares the system with 3 other known planets.
How far is that, really?
At 155 light-years, tonight's light from this system left it around the year 1871. A Voyager-speed probe would need roughly 2,734,803 years to get there.
How we found it
It was found by the transit method: the planet crosses its star's face on schedule, dimming it by a tiny, repeating fraction. The dip's depth gives the planet's size. The discovery was announced in 2022 from Transiting Exoplanet Survey Satellite (TESS).
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.