Kepler-212 c
Kepler-212 c is a mini-Neptune orbiting Kepler-212 in the constellation Lyra. It lies about 2,241 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-212 c?
Kepler-212 c has a radius of 2.74 times that of Earth.
Is Kepler-212 c in the Habitable Zone?
Kepler-212 c orbits inside the inner edge of the habitable zone of Kepler-212. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-212: 1.115–2.622 AU (conservative: 1.412–2.486 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-212 c — one full orbit around Kepler-212 — lasts 31.8 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.207 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-212 c Discovered?
Kepler-212 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-212 c?
Kepler-212 c is 2,241.3 light-years (687.2 parsecs) from Earth. Light arriving here tonight left the planet about 2,241 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 39,446,880 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-212 c scores 0.24, ranking #3,268 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-212
Kepler-212
- Surface temperature
- 5,852 K (Sun: 5,772 K)
- Radius
- 1.46 R☉
The Kepler-212 Planetary System
Kepler-212 c is one of 2 known planets in the Kepler-212 system. Its siblings:
- Kepler-212 b (Terrestrial)
Kepler-212 c — Complete Data
| Radius | 2.740 Earth radii (0.244 Jupiter radii) |
|---|---|
| Orbital period | 31.81 days |
| Orbital distance | 0.207 AU |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 2,241.3 light-years (687.2 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-212 c
Is Kepler-212 c habitable?
No — Kepler-212 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-212 c?
Kepler-212 c is about 2,241 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 39,446,880 years to get there.
How big is Kepler-212 c compared to Earth?
Kepler-212 c has 2.74 times the radius of Earth.
How long is a year on Kepler-212 c?
One orbit around Kepler-212 takes 31.8 Earth days — short enough that 11 of its years would fit into one Earth year.
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