Kepler-100 b
Kepler-100 b is a super-Earth orbiting Kepler-100 in the constellation Lyra. It lies about 994 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-100 b?
Kepler-100 b has a radius of 1.34 times that of Earth. Its mass is 4.0 times that of Earth.
Is Kepler-100 b in the Habitable Zone?
The position of Kepler-100 b relative to the habitable zone of Kepler-100 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-100 b — one full orbit around Kepler-100 — lasts 6.89 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-100 b Discovered?
Kepler-100 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-100 b?
Kepler-100 b is 993.6 light-years (304.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1033. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,487,360 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-100 b scores 0.29, ranking #1,893 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-100
Kepler-100
- Mass
- 1.10 M☉
The Kepler-100 Planetary System
Kepler-100 b is one of 4 known planets in the Kepler-100 system. Its siblings:
- Kepler-100 c (Super Earth)
- Kepler-100 d (Super Earth)
- Kepler-100 e (Neptune-like)
Kepler-100 b — Complete Data
| Radius | 1.340 Earth radii (0.120 Jupiter radii) |
|---|---|
| Mass | 4.01 Earth masses (0.013 Jupiter masses) |
| Orbital period | 6.89 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 993.6 light-years (304.6 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2025-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-100 b
Is Kepler-100 b habitable?
Kepler-100 b is not known to orbit within the habitable zone of Kepler-100, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-100 b?
Kepler-100 b is about 994 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,487,360 years to get there.
How big is Kepler-100 b compared to Earth?
Kepler-100 b has 1.34 times the radius of Earth and about 4.0 times its mass.
How long is a year on Kepler-100 b?
One orbit around Kepler-100 takes 6.9 Earth days — short enough that 53 of its years would fit into one Earth year.
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