Kepler-307 b
Kepler-307 b is a mini-Neptune orbiting Kepler-307 in the constellation Cygnus. It lies about 1,877 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-307 b?
Kepler-307 b has a radius of 2.43 times that of Earth. Its mass is 7.4 times that of Earth, giving it a density of 2.62 g/cm³ — between that of rocky and gaseous planets.
Is Kepler-307 b in the Habitable Zone?
The position of Kepler-307 b relative to the habitable zone of Kepler-307 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-307: 0.540–1.288 AU (conservative: 0.684–1.221 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 ›
Temperature on Kepler-307 b
Kepler-307 b receives 59.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-307 b — one full orbit around Kepler-307 — lasts 10.4 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-307 b Discovered?
Kepler-307 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-307 b?
Kepler-307 b is 1,877.3 light-years (575.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,877 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 33,040,480 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-307 b scores 0.25, ranking #3,141 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-307
Kepler-307
- Surface temperature
- 5,367 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.81 R☉
The Kepler-307 Planetary System
Kepler-307 b is one of 2 known planets in the Kepler-307 system. Its siblings:
- Kepler-307 c (Mini Neptune)
Kepler-307 b — Complete Data
| Radius | 2.430 Earth radii (0.217 Jupiter radii) |
|---|---|
| Mass | 7.44 Earth masses (0.023 Jupiter masses) |
| Density | 2.62 g/cm³ (Earth: 5.51) |
| Orbital period | 10.42 days |
| Stellar irradiation | 59.70× Earth |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 1,877.3 light-years (575.6 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2016-04-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-307 b
Is Kepler-307 b habitable?
Kepler-307 b is not known to orbit within the habitable zone of Kepler-307, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-307 b?
Kepler-307 b is about 1,877 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 33,040,480 years to get there.
How big is Kepler-307 b compared to Earth?
Kepler-307 b has 2.43 times the radius of Earth and about 7.4 times its mass.
How long is a year on Kepler-307 b?
One orbit around Kepler-307 takes 10.4 Earth days — short enough that 35 of its years would fit into one Earth year.
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