Confirmed exoplanet · Database record + computed analysis
K2-187 b
A confirmed world orbiting K2-187, 1,079.3 light-years away.
An Earth-sized world
1.20 times Earth's radius, squarely in the terrestrial size range. With 1.9 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year lasts about 18.6 hours, making it an ultra-short-period planet skimming its star.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,542 °C. Hot enough to melt copper; any surface would glow. It receives 2,367.3 times the starlight Earth gets.
Its sun
Its star is Sun-like (5,438 K; the Sun is 5,772 K). It shares the system with 3 other known planets.
How far is that, really?
At 1,079 light-years, tonight's light from this system left it around the year 946. A Voyager-speed probe would need roughly 19,095,679 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 2018 from K2.
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.