Kepler-151 b
Kepler-151 b is a sub-Neptune orbiting Kepler-151 in the constellation Cygnus. It lies about 2,120 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-151 b?
Kepler-151 b has a radius of 3.06 times that of Earth.
Is Kepler-151 b in the Habitable Zone?
Kepler-151 b orbits inside the inner edge of the habitable zone of Kepler-151. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-151: 0.567–1.348 AU (conservative: 0.718–1.278 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-151 b — one full orbit around Kepler-151 — lasts 15.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.116 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-151 b Discovered?
Kepler-151 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-151 b?
Kepler-151 b is 2,119.7 light-years (649.9 parsecs) from Earth. Light arriving here tonight left the planet about 2,120 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 37,306,720 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-151 b scores 0.24, ranking #3,266 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-151
Kepler-151
- Surface temperature
- 5,460 K (Sun: 5,772 K)
- Radius
- 0.83 R☉
The Kepler-151 Planetary System
Kepler-151 b is one of 2 known planets in the Kepler-151 system. Its siblings:
- Kepler-151 c (Mini Neptune)
Kepler-151 b — Complete Data
| Radius | 3.060 Earth radii (0.273 Jupiter radii) |
|---|---|
| Orbital period | 15.23 days |
| Orbital distance | 0.116 AU |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 2,119.7 light-years (649.9 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-151 b
Is Kepler-151 b habitable?
No — Kepler-151 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-151 b?
Kepler-151 b is about 2,120 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 37,306,720 years to get there.
How big is Kepler-151 b compared to Earth?
Kepler-151 b has 3.06 times the radius of Earth.
How long is a year on Kepler-151 b?
One orbit around Kepler-151 takes 15.2 Earth days — short enough that 24 of its years would fit into one Earth year.
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