Kepler-815 b
Kepler-815 b is a Neptune-like planet orbiting Kepler-815 in the constellation Draco. It lies about 4,107 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-815 b?
Kepler-815 b has a radius of 4.11 times that of Earth.
Is Kepler-815 b in the Habitable Zone?
The position of Kepler-815 b relative to the habitable zone of Kepler-815 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-815: 2.026–4.892 AU (conservative: 2.566–4.638 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-815 b — one full orbit around Kepler-815 — lasts 8.58 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-815 b Discovered?
Kepler-815 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-815 b?
Kepler-815 b is 4,107.2 light-years (1,259.3 parsecs) from Earth. Light arriving here tonight left the planet about 4,107 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 72,286,720 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-815 b scores 0.17, ranking #4,075 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-815
Kepler-815
- Surface temperature
- 5,028 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 3.42 R☉
- Age
- 4.9 billion years (Sun: 4.6)
Planetary System
Kepler-815 b is the only planet known to orbit Kepler-815 so far.
Kepler-815 b — Complete Data
| Radius | 4.110 Earth radii (0.367 Jupiter radii) |
|---|---|
| Orbital period | 8.58 days |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 4,107.2 light-years (1,259.3 parsecs) |
| Constellation | Draco |
| 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-815 b
Is Kepler-815 b habitable?
Kepler-815 b is not known to orbit within the habitable zone of Kepler-815, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-815 b?
Kepler-815 b is about 4,107 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 72,286,720 years to get there.
How big is Kepler-815 b compared to Earth?
Kepler-815 b has 4.11 times the radius of Earth.
How long is a year on Kepler-815 b?
One orbit around Kepler-815 takes 8.6 Earth days — short enough that 43 of its years would fit into one Earth year.
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