Confirmed exoplanet · Database record + computed analysis
PSR B1257+12 b
A confirmed world orbiting PSR B1257+12, 1,956.9 light-years away.
A sub-Earth
smaller than Earth at 0.34 Earth radii. Worlds this small are hard to detect, so every one is a catch.
The orbit
Its year, one full orbit, takes just 25.3 Earth days.
Its sun
It shares the system with 2 other known planets.
How far is that, really?
At 1,957 light-years, tonight's light from this system left it around the year 69. A Voyager-speed probe would need roughly 34,623,311 years to get there.
How we found it
It was found by pulsar timing: irregularities in a dead star's metronome-precise radio pulses. Planets around pulsars either survived a supernova or formed from its wreckage. The discovery was announced in 1994 from Arecibo Observatory.
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.