Kepler-116 b
Kepler-116 b is a sub-Neptune orbiting Kepler-116 in the constellation Cygnus. It lies about 3,115 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-116 b?
Kepler-116 b has a radius of 3.42 times that of Earth.
Is Kepler-116 b in the Habitable Zone?
Kepler-116 b orbits inside the inner edge of the habitable zone of Kepler-116. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-116: 1.206–2.817 AU (conservative: 1.528–2.671 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-116 b — one full orbit around Kepler-116 — lasts 5.97 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.069 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-116 b Discovered?
Kepler-116 b 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-116 b?
Kepler-116 b is 3,115.3 light-years (955.2 parsecs) from Earth. Light arriving here tonight left the planet about 3,115 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 54,829,280 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-116 b scores 0.20, ranking #3,916 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-116
Kepler-116
- Surface temperature
- 6,142 K (Sun: 5,772 K)
- Radius
- 1.45 R☉
The Kepler-116 Planetary System
Kepler-116 b is one of 2 known planets in the Kepler-116 system. Its siblings:
- Kepler-116 c (Mini Neptune)
Kepler-116 b — Complete Data
| Radius | 3.420 Earth radii (0.305 Jupiter radii) |
|---|---|
| Orbital period | 5.97 days |
| Orbital distance | 0.069 AU |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 3,115.3 light-years (955.2 parsecs) |
| Constellation | Cygnus |
| 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-116 b
Is Kepler-116 b habitable?
No — Kepler-116 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-116 b?
Kepler-116 b is about 3,115 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 54,829,280 years to get there.
How big is Kepler-116 b compared to Earth?
Kepler-116 b has 3.42 times the radius of Earth.
How long is a year on Kepler-116 b?
One orbit around Kepler-116 takes 6.0 Earth days — short enough that 61 of its years would fit into one Earth year.
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