Kepler-975 c
Kepler-975 c is a hot Jupiter orbiting Kepler-975 in the constellation Lyra. It lies about 1,390 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is Kepler-975 c?
Kepler-975 c has a radius of 10.69 times that of Earth, or 0.95 times the radius of Jupiter.
Is Kepler-975 c in the Habitable Zone?
Kepler-975 c orbits inside the inner edge of the habitable zone of Kepler-975. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-975: 0.424–1.029 AU (conservative: 0.537–0.976 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-975 c
The equilibrium temperature of Kepler-975 c is about 1,168 K (895 °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 440 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-975 c — one full orbit around Kepler-975 — lasts 5.06 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.057 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-975 c Discovered?
Kepler-975 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-975 c?
Kepler-975 c is 1,389.7 light-years (426.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,390 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 24,458,720 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-975 c scores 0.09, ranking #4,495 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-975
Kepler-975
- Surface temperature
- 4,897 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.75 R☉
- Age
- 3.9 billion years (Sun: 4.6)
The Kepler-975 Planetary System
Kepler-975 c is one of 2 known planets in the Kepler-975 system. Its siblings:
- Kepler-975 b (Super Earth)
Kepler-975 c — Complete Data
| Radius | 10.690 Earth radii (0.954 Jupiter radii) |
|---|---|
| Orbital period | 5.06 days |
| Orbital distance | 0.057 AU |
| Equilibrium temperature | 1,168 K (895 °C) |
| Stellar irradiation | 439.80× Earth |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 1,389.7 light-years (426.1 parsecs) |
| Constellation | Lyra |
| 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-975 c
Is Kepler-975 c habitable?
No — Kepler-975 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-975 c?
Kepler-975 c is about 1,390 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 24,458,720 years to get there.
How big is Kepler-975 c compared to Earth?
Kepler-975 c has 10.69 times the radius of Earth.
How long is a year on Kepler-975 c?
One orbit around Kepler-975 takes 5.1 Earth days — short enough that 72 of its years would fit into one Earth year.
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