Kepler-849 b
Kepler-849 b is a cold gas giant orbiting Kepler-849 in the constellation Cygnus. It lies about 2,681 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-849 b?
Kepler-849 b has a radius of 8.08 times that of Earth, or 0.72 times the radius of Jupiter. Its mass is 299 times that of Earth, giving it a density of 3.09 g/cm³ — between that of rocky and gaseous planets.
Is Kepler-849 b in the Habitable Zone?
Kepler-849 b orbits inside the inner edge of the habitable zone of Kepler-849. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-849: 1.436–3.369 AU (conservative: 1.819–3.194 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-849 b
The equilibrium temperature of Kepler-849 b is about 363 K (90 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 2.86 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-849 b — one full orbit around Kepler-849 — lasts 394.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.137 AU. Its orbit is mildly elliptical (eccentricity 0.08).
How Was Kepler-849 b Discovered?
Kepler-849 b was discovered in 2016 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-849 b?
Kepler-849 b is 2,681.4 light-years (822.1 parsecs) from Earth. Light arriving here tonight left the planet about 2,681 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 47,192,640 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-849 b scores 0.35, ranking #786 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-849
Kepler-849
- Surface temperature
- 5,950 K (Sun: 5,772 K)
- Mass
- 1.26 M☉
- Radius
- 1.82 R☉
- Luminosity
- 3.7400 L☉
- Age
- 4.7 billion years (Sun: 4.6)
Planetary System
Kepler-849 b is the only planet known to orbit Kepler-849 so far.
Kepler-849 b — Complete Data
| Radius | 8.082 Earth radii (0.721 Jupiter radii) |
|---|---|
| Mass | 298.76 Earth masses (0.940 Jupiter masses) |
| Density | 3.09 g/cm³ (Earth: 5.51) |
| Orbital period | 394.63 days |
| Orbital distance | 1.137 AU |
| Eccentricity | 0.078 |
| Equilibrium temperature | 363 K (90 °C) |
| Stellar irradiation | 2.86× Earth |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 2,681.4 light-years (822.1 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2024-09-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-849 b
Is Kepler-849 b habitable?
No — Kepler-849 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-849 b?
Kepler-849 b is about 2,681 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 47,192,640 years to get there.
How big is Kepler-849 b compared to Earth?
Kepler-849 b has 8.08 times the radius of Earth and about 299 times its mass.
How long is a year on Kepler-849 b?
One orbit around Kepler-849 takes 394.6 Earth days.
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