Kepler-299 b
Kepler-299 b is a super-Earth orbiting Kepler-299 in the constellation Draco. It lies about 3,432 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-299 b?
Kepler-299 b has a radius of 1.32 times that of Earth.
Is Kepler-299 b in the Habitable Zone?
Kepler-299 b orbits inside the inner edge of the habitable zone of Kepler-299. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-299: 0.739–1.749 AU (conservative: 0.936–1.658 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-299 b — one full orbit around Kepler-299 — lasts 2.93 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-299 b Discovered?
Kepler-299 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-299 b?
Kepler-299 b is 3,431.9 light-years (1,052.2 parsecs) from Earth. Light arriving here tonight left the planet about 3,432 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 60,401,440 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-299 b scores 0.29, ranking #1,914 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-299
Kepler-299
- Surface temperature
- 5,617 K (Sun: 5,772 K)
- Radius
- 1.03 R☉
The Kepler-299 Planetary System
Kepler-299 b is one of 4 known planets in the Kepler-299 system. Its siblings:
- Kepler-299 c (Mini Neptune)
- Kepler-299 d (Super Earth)
- Kepler-299 e (Super Earth)
Kepler-299 b — Complete Data
| Radius | 1.320 Earth radii (0.118 Jupiter radii) |
|---|---|
| Orbital period | 2.93 days |
| Orbital distance | 0.040 AU |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 3,431.9 light-years (1,052.2 parsecs) |
| Constellation | Draco |
| 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-299 b
Is Kepler-299 b habitable?
No — Kepler-299 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-299 b?
Kepler-299 b is about 3,432 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 60,401,440 years to get there.
How big is Kepler-299 b compared to Earth?
Kepler-299 b has 1.32 times the radius of Earth.
How long is a year on Kepler-299 b?
One orbit around Kepler-299 takes 2.9 Earth days — short enough that 125 of its years would fit into one Earth year.
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