Kepler-137 c
Kepler-137 c is a super-Earth orbiting Kepler-137 in the constellation Lyra. It lies about 988 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-137 c?
Kepler-137 c has a radius of 1.88 times that of Earth.
Is Kepler-137 c in the Habitable Zone?
Kepler-137 c orbits inside the inner edge of the habitable zone of Kepler-137. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-137: 0.502–1.204 AU (conservative: 0.635–1.141 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-137 c — one full orbit around Kepler-137 — lasts 18.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.130 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-137 c Discovered?
Kepler-137 c 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-137 c?
Kepler-137 c is 988.2 light-years (303.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1038. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,392,320 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-137 c scores 0.30, ranking #1,268 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-137
Kepler-137
- Surface temperature
- 5,187 K (Sun: 5,772 K)
- Radius
- 0.80 R☉
The Kepler-137 Planetary System
Kepler-137 c is one of 2 known planets in the Kepler-137 system. Its siblings:
- Kepler-137 b (Super Earth)
Kepler-137 c — Complete Data
| Radius | 1.880 Earth radii (0.168 Jupiter radii) |
|---|---|
| Orbital period | 18.74 days |
| Orbital distance | 0.130 AU |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 988.2 light-years (303.0 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-137 c
Is Kepler-137 c habitable?
No — Kepler-137 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-137 c?
Kepler-137 c is about 988 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,392,320 years to get there.
How big is Kepler-137 c compared to Earth?
Kepler-137 c has 1.88 times the radius of Earth.
How long is a year on Kepler-137 c?
One orbit around Kepler-137 takes 18.7 Earth days — short enough that 19 of its years would fit into one Earth year.
Explore Kepler-137 c in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
