Kepler-167 d
Kepler-167 d is a terrestrial planet orbiting Kepler-167 in the constellation Cygnus. It lies about 1,115 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-167 d?
Kepler-167 d has a radius of 1.24 times that of Earth.
Is Kepler-167 d in the Habitable Zone?
Kepler-167 d orbits inside the inner edge of the habitable zone of Kepler-167. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-167: 0.423–1.028 AU (conservative: 0.536–0.975 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-167 d
The equilibrium temperature of Kepler-167 d is about 538 K (265 °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.
Orbit and Year Length
A year on Kepler-167 d — one full orbit around Kepler-167 — lasts 21.8 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.140 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-167 d Discovered?
Kepler-167 d 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-167 d?
Kepler-167 d is 1,115.2 light-years (341.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,115 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,627,520 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-167 d scores 0.38, ranking #584 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-167
Kepler-167 d belongs to a system of 2 stars; it orbits Kepler-167.
Kepler-167
- Surface temperature
- 4,884 K (Sun: 5,772 K)
- Mass
- 0.78 M☉
- Radius
- 0.75 R☉
- Luminosity
- 0.2890 L☉
- Age
- 7.1 billion years (Sun: 4.6)
The Kepler-167 Planetary System
Kepler-167 d is one of 4 known planets in the Kepler-167 system. Its siblings:
- Kepler-167 b (Super Earth)
- Kepler-167 c (Super Earth)
- Kepler-167 e (Cold Gas Giant)
Kepler-167 d — Complete Data
| Radius | 1.238 Earth radii (0.110 Jupiter radii) |
|---|---|
| Orbital period | 21.80 days |
| Orbital distance | 0.140 AU |
| Equilibrium temperature | 538 K (265 °C) |
| Earth Similarity Index | 0.38 |
| Distance from Earth | 1,115.2 light-years (341.9 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2022-07-18. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-167 d
Is Kepler-167 d habitable?
No — Kepler-167 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-167 d?
Kepler-167 d is about 1,115 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,627,520 years to get there.
How big is Kepler-167 d compared to Earth?
Kepler-167 d has 1.24 times the radius of Earth.
How long is a year on Kepler-167 d?
One orbit around Kepler-167 takes 21.8 Earth days — short enough that 17 of its years would fit into one Earth year.
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