Confirmed exoplanet · Database record + computed analysis
Kepler-139 f
A confirmed world orbiting Kepler-139, 1,275.4 light-years away.
A Neptune-class world
6.67 Earth radii, in the ice-giant size range. At only 36.0 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year takes 355 Earth days (1.0 Earth years).
Its sun
Its star is Sun-like (5,630 K; the Sun is 5,772 K). It shares the system with 4 other known planets.
How far is that, really?
At 1,275 light-years, tonight's light from this system left it around the year 750. A Voyager-speed probe would need roughly 22,565,050 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 2025 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.