Kepler-238 f
Kepler-238 f is a super-Earth orbiting Kepler-238 in the constellation Lyra. It lies about 5,867 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-238 f?
Kepler-238 f has a radius of 2.00 times that of Earth. Its mass is 13.5 times that of Earth.
Is Kepler-238 f in the Habitable Zone?
The position of Kepler-238 f relative to the habitable zone of Kepler-238 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-238: 1.065–2.511 AU (conservative: 1.349–2.380 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-238 f — one full orbit around Kepler-238 — lasts 50.4 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-238 f Discovered?
Kepler-238 f was discovered in 2013 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-238 f?
Kepler-238 f is 5,866.7 light-years (1,798.8 parsecs) from Earth. Light arriving here tonight left the planet about 5,867 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 103,253,920 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-238 f scores 0.29, ranking #1,788 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-238
Kepler-238
- Surface temperature
- 5,751 K (Sun: 5,772 K)
- Radius
- 1.43 R☉
The Kepler-238 Planetary System
Kepler-238 f is one of 5 known planets in the Kepler-238 system. Its siblings:
- Kepler-238 b (Super Earth)
- Kepler-238 c (Mini Neptune)
- Kepler-238 d (Sub Neptune)
- Kepler-238 e (Neptune-like)
Kepler-238 f — Complete Data
| Radius | 2.000 Earth radii (0.178 Jupiter radii) |
|---|---|
| Mass | 13.50 Earth masses (0.042 Jupiter masses) |
| Orbital period | 50.45 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 5,866.7 light-years (1,798.8 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-238 f
Is Kepler-238 f habitable?
Kepler-238 f is not known to orbit within the habitable zone of Kepler-238, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-238 f?
Kepler-238 f is about 5,867 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 103,253,920 years to get there.
How big is Kepler-238 f compared to Earth?
Kepler-238 f has 2.00 times the radius of Earth and about 13.5 times its mass.
How long is a year on Kepler-238 f?
One orbit around Kepler-238 takes 50.4 Earth days.
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