Kepler-67 b
Kepler-67 b is a mini-Neptune orbiting the G9 V star Kepler-67 in the constellation Cygnus. It lies about 3,689 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-67 b?
Kepler-67 b has a radius of 2.94 times that of Earth.
Is Kepler-67 b in the Habitable Zone?
Kepler-67 b orbits inside the inner edge of the habitable zone of Kepler-67. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-67: 0.510–1.218 AU (conservative: 0.646–1.155 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-67 b — one full orbit around Kepler-67 — lasts 15.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.117 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-67 b Discovered?
Kepler-67 b was discovered in 2013 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-67 b?
Kepler-67 b is 3,689.4 light-years (1,131.2 parsecs) from Earth. Light arriving here tonight left the planet about 3,689 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 64,933,440 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-67 b scores 0.25, ranking #3,062 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-67
Kepler-67
- Spectral type
- G9 V
- Surface temperature
- 5,331 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 0.78 R☉
- Age
- 1.0 billion years (Sun: 4.6)
Planetary System
Kepler-67 b is the only planet known to orbit Kepler-67 so far.
Kepler-67 b — Complete Data
| Radius | 2.940 Earth radii (0.262 Jupiter radii) |
|---|---|
| Orbital period | 15.73 days |
| Orbital distance | 0.117 AU |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 3,689.4 light-years (1,131.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-67 b
Is Kepler-67 b habitable?
No — Kepler-67 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-67 b?
Kepler-67 b is about 3,689 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 64,933,440 years to get there.
How big is Kepler-67 b compared to Earth?
Kepler-67 b has 2.94 times the radius of Earth.
How long is a year on Kepler-67 b?
One orbit around Kepler-67 takes 15.7 Earth days — short enough that 23 of its years would fit into one Earth year.
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