Kepler-147 c
Kepler-147 c is a mini-Neptune orbiting Kepler-147 in the constellation Lyra. It lies about 3,399 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-147 c?
Kepler-147 c has a radius of 2.43 times that of Earth.
Is Kepler-147 c in the Habitable Zone?
Kepler-147 c orbits inside the inner edge of the habitable zone of Kepler-147. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-147: 1.176–2.755 AU (conservative: 1.489–2.612 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-147 c — one full orbit around Kepler-147 — lasts 33.4 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.216 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-147 c Discovered?
Kepler-147 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-147 c?
Kepler-147 c is 3,398.6 light-years (1,042.0 parsecs) from Earth. Light arriving here tonight left the planet about 3,399 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 59,815,360 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-147 c scores 0.26, ranking #2,968 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-147
Kepler-147
- Surface temperature
- 6,012 K (Sun: 5,772 K)
- Radius
- 1.47 R☉
The Kepler-147 Planetary System
Kepler-147 c is one of 2 known planets in the Kepler-147 system. Its siblings:
- Kepler-147 b (Super Earth)
Kepler-147 c — Complete Data
| Radius | 2.430 Earth radii (0.217 Jupiter radii) |
|---|---|
| Orbital period | 33.42 days |
| Orbital distance | 0.216 AU |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 3,398.6 light-years (1,042.0 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-147 c
Is Kepler-147 c habitable?
No — Kepler-147 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-147 c?
Kepler-147 c is about 3,399 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 59,815,360 years to get there.
How big is Kepler-147 c compared to Earth?
Kepler-147 c has 2.43 times the radius of Earth.
How long is a year on Kepler-147 c?
One orbit around Kepler-147 takes 33.4 Earth days — short enough that 11 of its years would fit into one Earth year.
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