Kepler-169 f
Kepler-169 f is a mini-Neptune orbiting Kepler-169 in the constellation Lyra. It lies about 1,326 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-169 f?
Kepler-169 f has a radius of 2.58 times that of Earth.
Is Kepler-169 f in the Habitable Zone?
Kepler-169 f orbits inside the inner edge of the habitable zone of Kepler-169. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-169: 0.447–1.081 AU (conservative: 0.566–1.025 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-169 f — one full orbit around Kepler-169 — lasts 87.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.359 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-169 f Discovered?
Kepler-169 f was discovered in 2014 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-169 f?
Kepler-169 f is 1,325.9 light-years (406.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,326 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 23,335,840 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-169 f scores 0.57, ranking #171 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-169
Kepler-169
- Surface temperature
- 4,997 K (Sun: 5,772 K)
- Radius
- 0.76 R☉
The Kepler-169 Planetary System
Kepler-169 f is one of 5 known planets in the Kepler-169 system. Its siblings:
- Kepler-169 b (Terrestrial)
- Kepler-169 c (Terrestrial)
- Kepler-169 d (Terrestrial)
- Kepler-169 e (Mini Neptune)
Kepler-169 f — Complete Data
| Radius | 2.580 Earth radii (0.230 Jupiter radii) |
|---|---|
| Orbital period | 87.09 days |
| Orbital distance | 0.359 AU |
| Earth Similarity Index | 0.57 |
| Distance from Earth | 1,325.9 light-years (406.5 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-169 f
Is Kepler-169 f habitable?
No — Kepler-169 f orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-169 f?
Kepler-169 f is about 1,326 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 23,335,840 years to get there.
How big is Kepler-169 f compared to Earth?
Kepler-169 f has 2.58 times the radius of Earth.
How long is a year on Kepler-169 f?
One orbit around Kepler-169 takes 87.1 Earth days.
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