Kepler-164 e
Kepler-164 e is a Neptune-like planet orbiting Kepler-164 in the constellation Lyra. It lies about 2,905 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is Kepler-164 e?
Kepler-164 e has a radius of 4.24 times that of Earth.
Is Kepler-164 e in the Habitable Zone?
Kepler-164 e orbits inside the inner edge of the habitable zone of Kepler-164. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-164: 0.889–2.088 AU (conservative: 1.126–1.980 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-164 e
The equilibrium temperature of Kepler-164 e is about 429 K (156 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 7.99 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-164 e — one full orbit around Kepler-164 — lasts 94.9 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.403 AU — comparable to the inner Solar System.
How Was Kepler-164 e Discovered?
Kepler-164 e was discovered in 2023 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-164 e?
Kepler-164 e is 2,905.3 light-years (890.8 parsecs) from Earth. Light arriving here tonight left the planet about 2,905 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 51,133,280 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-164 e scores 0.30, ranking #1,463 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-164
Kepler-164
- Surface temperature
- 5,888 K (Sun: 5,772 K)
- Radius
- 1.15 R☉
The Kepler-164 Planetary System
Kepler-164 e is one of 4 known planets in the Kepler-164 system. Its siblings:
- Kepler-164 b (Super Earth)
- Kepler-164 c (Mini Neptune)
- Kepler-164 d (Mini Neptune)
Kepler-164 e — Complete Data
| Radius | 4.240 Earth radii (0.378 Jupiter radii) |
|---|---|
| Orbital period | 94.89 days |
| Orbital distance | 0.403 AU |
| Equilibrium temperature | 429 K (156 °C) |
| Stellar irradiation | 7.99× Earth |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 2,905.3 light-years (890.8 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2017-05-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-164 e
Is Kepler-164 e habitable?
No — Kepler-164 e orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-164 e?
Kepler-164 e is about 2,905 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 51,133,280 years to get there.
How big is Kepler-164 e compared to Earth?
Kepler-164 e has 4.24 times the radius of Earth.
How long is a year on Kepler-164 e?
One orbit around Kepler-164 takes 94.9 Earth days.
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