Kepler-338 e
Kepler-338 e is a super-Earth orbiting Kepler-338 in the constellation Lyra. It lies about 1,803 light-years from Earth and was discovered in 2014 using the transit timing variations method.
How Big Is Kepler-338 e?
Kepler-338 e has a radius of 1.56 times that of Earth. Its mass is 8.5 times that of Earth.
Is Kepler-338 e in the Habitable Zone?
The position of Kepler-338 e relative to the habitable zone of Kepler-338 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-338: 1.356–3.184 AU (conservative: 1.718–3.018 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-338 e — one full orbit around Kepler-338 — lasts 9.34 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-338 e Discovered?
Kepler-338 e was discovered in 2014 using the transit timing variations method, with observations from Kepler.
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-338 e?
Kepler-338 e is 1,803.0 light-years (552.8 parsecs) from Earth. Light arriving here tonight left the planet about 1,803 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 31,732,800 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-338 e scores 0.28, ranking #2,283 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-338
Kepler-338
- Surface temperature
- 5,923 K (Sun: 5,772 K)
- Radius
- 1.74 R☉
The Kepler-338 Planetary System
Kepler-338 e is one of 4 known planets in the Kepler-338 system. Its siblings:
- Kepler-338 b (Mini Neptune)
- Kepler-338 c (Mini Neptune)
- Kepler-338 d (Mini Neptune)
Kepler-338 e — Complete Data
| Radius | 1.560 Earth radii (0.139 Jupiter radii) |
|---|---|
| Mass | 8.50 Earth masses (0.027 Jupiter masses) |
| Orbital period | 9.34 days |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 1,803.0 light-years (552.8 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit Timing Variations |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-05-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-338 e
Is Kepler-338 e habitable?
Kepler-338 e is not known to orbit within the habitable zone of Kepler-338, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-338 e?
Kepler-338 e is about 1,803 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 31,732,800 years to get there.
How big is Kepler-338 e compared to Earth?
Kepler-338 e has 1.56 times the radius of Earth and about 8.5 times its mass.
How long is a year on Kepler-338 e?
One orbit around Kepler-338 takes 9.3 Earth days — short enough that 39 of its years would fit into one Earth year.
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