Kepler-517 b
Kepler-517 b is a mini-Neptune orbiting Kepler-517 in the constellation Cygnus. It lies about 946 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-517 b?
Kepler-517 b has a radius of 2.67 times that of Earth.
Is Kepler-517 b in the Habitable Zone?
The position of Kepler-517 b relative to the habitable zone of Kepler-517 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-517: 0.717–1.693 AU (conservative: 0.908–1.605 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-517 b — one full orbit around Kepler-517 — lasts 60.9 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-517 b Discovered?
Kepler-517 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-517 b?
Kepler-517 b is 945.5 light-years (289.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1081. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 16,640,800 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-517 b scores 0.33, ranking #963 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-517
Kepler-517 b belongs to a system of 2 stars; it orbits Kepler-517.
Kepler-517
- Surface temperature
- 5,690 K (Sun: 5,772 K)
- Mass
- 0.95 M☉
- Radius
- 0.98 R☉
- Age
- 6.3 billion years (Sun: 4.6)
Planetary System
Kepler-517 b is the only planet known to orbit Kepler-517 so far.
Kepler-517 b — Complete Data
| Radius | 2.670 Earth radii (0.238 Jupiter radii) |
|---|---|
| Orbital period | 60.93 days |
| Earth Similarity Index | 0.33 |
| Distance from Earth | 945.5 light-years (289.9 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-05-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-517 b
Is Kepler-517 b habitable?
Kepler-517 b is not known to orbit within the habitable zone of Kepler-517, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-517 b?
Kepler-517 b is about 946 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 16,640,800 years to get there.
How big is Kepler-517 b compared to Earth?
Kepler-517 b has 2.67 times the radius of Earth.
How long is a year on Kepler-517 b?
One orbit around Kepler-517 takes 60.9 Earth days.
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