Confirmed exoplanet · Database record + computed analysis
Kepler-51 e
A confirmed world orbiting Kepler-51, 2,556.5 light-years away.
A sub-Neptune
2.18 Earth radii, likely a rocky core under a thick gas or steam envelope rather than a walkable surface.
The orbit
Its year takes 264 Earth days (0.7 Earth years).
Its sun
Its star is Sun-like (5,674 K; the Sun is 5,772 K). It shares the system with 3 other known planets.
How far is that, really?
At 2,557 light-years, tonight's light from this system left it around the year -530. A Voyager-speed probe would need roughly 45,231,374 years to get there.
How we found it
It was found through transit timing variations: its gravity nudges a sibling planet's transits early and late, betraying its presence without ever being seen directly. The discovery was announced in 2024 from Multiple Observatories.
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.