Kepler-82 e
Kepler-82 e is a mini-Neptune orbiting Kepler-82 in the constellation Cygnus. It lies about 2,950 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-82 e?
Kepler-82 e has a radius of 2.47 times that of Earth.
Is Kepler-82 e in the Habitable Zone?
The position of Kepler-82 e relative to the habitable zone of Kepler-82 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-82 e — one full orbit around Kepler-82 — lasts 5.90 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.063 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-82 e Discovered?
Kepler-82 e 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-82 e?
Kepler-82 e is 2,949.5 light-years (904.3 parsecs) from Earth. Light arriving here tonight left the planet about 2,950 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 51,911,200 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-82 e scores 0.24, ranking #3,311 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-82
Kepler-82
- Mass
- 0.91 M☉
- Radius
- 0.90 R☉
The Kepler-82 Planetary System
Kepler-82 e is one of 5 known planets in the Kepler-82 system. Its siblings:
- Kepler-82 b (Neptune-like)
- Kepler-82 c (Neptune-like)
- Kepler-82 d (Super Earth)
- Kepler-82 f (Neptune-like)
Kepler-82 e — Complete Data
| Radius | 2.470 Earth radii (0.220 Jupiter radii) |
|---|---|
| Orbital period | 5.90 days |
| Orbital distance | 0.063 AU |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 2,949.5 light-years (904.3 parsecs) |
| Constellation | Cygnus |
| 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-82 e
Is Kepler-82 e habitable?
Kepler-82 e is not known to orbit within the habitable zone of Kepler-82, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-82 e?
Kepler-82 e is about 2,950 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 51,911,200 years to get there.
How big is Kepler-82 e compared to Earth?
Kepler-82 e has 2.47 times the radius of Earth.
How long is a year on Kepler-82 e?
One orbit around Kepler-82 takes 5.9 Earth days — short enough that 62 of its years would fit into one Earth year.
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