Kepler-80 d
Kepler-80 d is a super-Earth orbiting Kepler-80 in the constellation Cygnus. It lies about 1,205 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-80 d?
Kepler-80 d has a radius of 1.53 times that of Earth. Its mass is 6.8 times that of Earth, giving it a density of 7.04 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is Kepler-80 d in the Habitable Zone?
Kepler-80 d orbits inside the inner edge of the habitable zone of Kepler-80. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-80: 0.334–0.824 AU (conservative: 0.423–0.782 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-80 d — one full orbit around Kepler-80 — lasts 3.07 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.037 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-80 d Discovered?
Kepler-80 d 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-80 d?
Kepler-80 d is 1,205.0 light-years (369.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,205 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,208,000 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-80 d scores 0.29, ranking #1,908 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-80
Kepler-80
- Surface temperature
- 4,540 K (Sun: 5,772 K)
- Mass
- 0.83 M☉
- Radius
- 0.68 R☉
The Kepler-80 Planetary System
Kepler-80 d is one of 6 known planets in the Kepler-80 system. Its siblings:
- Kepler-80 b (Puffy Planet)
- Kepler-80 c (Puffy Planet)
- Kepler-80 e (Super Earth)
- Kepler-80 f (Terrestrial)
- Kepler-80 g (Terrestrial)
Kepler-80 d — Complete Data
| Radius | 1.530 Earth radii (0.136 Jupiter radii) |
|---|---|
| Mass | 6.75 Earth masses (0.021 Jupiter masses) |
| Density | 7.04 g/cm³ (Earth: 5.51) |
| Orbital period | 3.07 days |
| Orbital distance | 0.037 AU |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 1,205.0 light-years (369.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2016-08-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-80 d
Is Kepler-80 d habitable?
No — Kepler-80 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-80 d?
Kepler-80 d is about 1,205 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,208,000 years to get there.
How big is Kepler-80 d compared to Earth?
Kepler-80 d has 1.53 times the radius of Earth and about 6.8 times its mass.
How long is a year on Kepler-80 d?
One orbit around Kepler-80 takes 3.1 Earth days — short enough that 119 of its years would fit into one Earth year.
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