Confirmed exoplanet · Database record + computed analysis
TOI-540 b
A confirmed world orbiting TOI-540, 45.7 light-years away.
An Earth-sized world
0.90 times Earth's radius, squarely in the terrestrial size range. With 0.7 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year, one full orbit, takes just 1.2 Earth days. 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 338 °C. Above water's boiling point. It receives 23.4 times the starlight Earth gets.
Its sun
Its star is a red dwarf (3,216 K surface), type M V: small, dim, flare-prone, and destined to outlive the Sun many times over.
How far is that, really?
At 46 light-years, tonight's light from this system left it around the year 1980. That is close by galactic standards, which makes it a prime target for follow-up telescopes. A Voyager-speed probe would need roughly 808,004 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 2020 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.