Kepler-2000 c
Kepler-2000 c is a super-Earth orbiting Kepler-2000 in the constellation Draco. It lies about 1,046 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is Kepler-2000 c?
Kepler-2000 c has a radius of 1.57 times that of Earth.
Is Kepler-2000 c in the Habitable Zone?
Kepler-2000 c orbits inside the inner edge of the habitable zone of Kepler-2000. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-2000: 0.198–0.508 AU (conservative: 0.251–0.482 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-2000 c
The equilibrium temperature of Kepler-2000 c is about 359 K (86 °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. It receives 3.92 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-2000 c — one full orbit around Kepler-2000 — lasts 20.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.123 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-2000 c Discovered?
Kepler-2000 c was discovered in 2023 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-2000 c?
Kepler-2000 c is 1,045.6 light-years (320.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,046 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,402,560 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-2000 c scores 0.47, ranking #289 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-2000
Kepler-2000
- Surface temperature
- 3,757 K (Sun: 5,772 K)
- Mass
- 0.58 M☉
- Radius
- 0.58 R☉
The Kepler-2000 Planetary System
Kepler-2000 c is one of 2 known planets in the Kepler-2000 system. Its siblings:
- Kepler-2000 b (Mini Neptune)
Kepler-2000 c — Complete Data
| Radius | 1.570 Earth radii (0.140 Jupiter radii) |
|---|---|
| Orbital period | 20.62 days |
| Orbital distance | 0.123 AU |
| Equilibrium temperature | 359 K (86 °C) |
| Stellar irradiation | 3.92× Earth |
| Earth Similarity Index | 0.47 |
| Distance from Earth | 1,045.6 light-years (320.6 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2017-05-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-2000 c
Is Kepler-2000 c habitable?
No — Kepler-2000 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-2000 c?
Kepler-2000 c is about 1,046 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,402,560 years to get there.
How big is Kepler-2000 c compared to Earth?
Kepler-2000 c has 1.57 times the radius of Earth.
How long is a year on Kepler-2000 c?
One orbit around Kepler-2000 takes 20.6 Earth days — short enough that 18 of its years would fit into one Earth year.
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