Kepler-107 d
Kepler-107 d is a terrestrial planet orbiting Kepler-107 in the constellation Cygnus. It lies about 1,716 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-107 d?
Kepler-107 d has a radius of 0.86 times that of Earth. Its mass is 7.7 times that of Earth, giving it a density of 67.00 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is Kepler-107 d in the Habitable Zone?
Kepler-107 d orbits inside the inner edge of the habitable zone of Kepler-107. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-107: 1.110–2.609 AU (conservative: 1.405–2.474 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-107 d
The equilibrium temperature of Kepler-107 d is about 1,173 K (900 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 315 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-107 d — one full orbit around Kepler-107 — lasts 7.96 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.084 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.11).
How Was Kepler-107 d Discovered?
Kepler-107 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-107 d?
Kepler-107 d is 1,715.6 light-years (526.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,716 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 30,194,560 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-107 d scores 0.30, ranking #1,555 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-107
Kepler-107
- Surface temperature
- 5,854 K (Sun: 5,772 K)
- Mass
- 1.24 M☉
- Radius
- 1.45 R☉
- Age
- 4.3 billion years (Sun: 4.6)
The Kepler-107 Planetary System
Kepler-107 d is one of 4 known planets in the Kepler-107 system. Its siblings:
- Kepler-107 b (Lava World)
- Kepler-107 c (Super Earth)
- Kepler-107 e (Super Earth)
Kepler-107 d — Complete Data
| Radius | 0.860 Earth radii (0.077 Jupiter radii) |
|---|---|
| Mass | 7.70 Earth masses (0.024 Jupiter masses) |
| Density | 67.00 g/cm³ (Earth: 5.51) |
| Orbital period | 7.96 days |
| Orbital distance | 0.084 AU |
| Eccentricity | 0.110 |
| Equilibrium temperature | 1,173 K (900 °C) |
| Stellar irradiation | 315.00× Earth |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 1,715.6 light-years (526.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2023-04-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-107 d
Is Kepler-107 d habitable?
No — Kepler-107 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-107 d?
Kepler-107 d is about 1,716 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 30,194,560 years to get there.
How big is Kepler-107 d compared to Earth?
Kepler-107 d has 0.86 times the radius of Earth and about 7.7 times its mass.
How long is a year on Kepler-107 d?
One orbit around Kepler-107 takes 8.0 Earth days — short enough that 46 of its years would fit into one Earth year.
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