Kepler-289 e
Kepler-289 e is a Neptune-like planet orbiting Kepler-289 in the constellation Cygnus. It lies about 2,298 light-years from Earth and was discovered in 2025 using the transit method.
Is Kepler-289 e in the Habitable Zone?
The position of Kepler-289 e relative to the habitable zone of Kepler-289 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-289: 0.795–1.863 AU (conservative: 1.007–1.766 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on Kepler-289 e — one full orbit around Kepler-289 — lasts 330.1 Earth days, between the years of Mercury (88 days) and Earth (365 days).
How Was Kepler-289 e Discovered?
Kepler-289 e was discovered in 2025 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Kepler-289 e?
Kepler-289 e is 2,297.6 light-years (704.4 parsecs) from Earth. Light arriving here tonight left the planet about 2,298 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 40,437,760 years to make the journey.
The Host Star: Kepler-289
Kepler-289
- Surface temperature
- 5,990 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.00 R☉
- Luminosity
- 1.1508 L☉
- Age
- 0.7 billion years (Sun: 4.6)
The Kepler-289 Planetary System
Kepler-289 e is one of 4 known planets in the Kepler-289 system. Its siblings:
- Kepler-289 b (Puffy Planet)
- Kepler-289 c (Cold Gas Giant)
- Kepler-289 d (Puffy Planet)
Kepler-289 e — Complete Data
| Mass | 17.40 Earth masses (0.055 Jupiter masses) |
|---|---|
| Density | 2.92 g/cm³ (Earth: 5.51) |
| Orbital period | 330.07 days |
| Distance from Earth | 2,297.6 light-years (704.4 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-289 e
Is Kepler-289 e habitable?
Kepler-289 e is not known to orbit within the habitable zone of Kepler-289, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-289 e?
Kepler-289 e is about 2,298 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 40,437,760 years to get there.
How long is a year on Kepler-289 e?
One orbit around Kepler-289 takes 330.1 Earth days.
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