Kepler-139 f
Kepler-139 f is a Neptune-like planet orbiting Kepler-139 in the constellation Lyra. It lies about 1,275 light-years from Earth and was discovered in 2025 using the transit timing variations method.
Is Kepler-139 f in the Habitable Zone?
The position of Kepler-139 f relative to the habitable zone of Kepler-139 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-139 f — one full orbit around Kepler-139 — lasts 355.0 Earth days, between the years of Mercury (88 days) and Earth (365 days).
How Was Kepler-139 f Discovered?
Kepler-139 f was discovered in 2025 using the transit timing variations method, with observations from Multiple Observatories.
Transit timing variations reveal a planet through its gravitational tug on a sibling planet, which makes that sibling's transits arrive slightly early or late. The pattern of these deviations betrays the hidden planet's mass and orbit.
How Far Away Is Kepler-139 f?
Kepler-139 f is 1,275.4 light-years (391.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,275 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,447,040 years to make the journey.
The Host Star: Kepler-139
Kepler-139
- Mass
- 1.08 M☉
The Kepler-139 Planetary System
Kepler-139 f is one of 5 known planets in the Kepler-139 system. Its siblings:
- Kepler-139 b (Mini Neptune)
- Kepler-139 c (Sub Neptune)
- Kepler-139 d (Super Earth)
- Kepler-139 e (Cold Gas Giant)
Kepler-139 f — Complete Data
| Mass | 36.00 Earth masses (0.113 Jupiter masses) |
|---|---|
| Orbital period | 355.00 days |
| Distance from Earth | 1,275.4 light-years (391.0 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit Timing Variations |
| Discovery facility | Multiple Observatories |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-04-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-139 f
Is Kepler-139 f habitable?
Kepler-139 f is not known to orbit within the habitable zone of Kepler-139, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-139 f?
Kepler-139 f is about 1,275 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,447,040 years to get there.
How long is a year on Kepler-139 f?
One orbit around Kepler-139 takes 355.0 Earth days.
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