K2-75 c
K2-75 c is a mini-Neptune orbiting K2-75 in the constellation Aquarius. It lies about 1,833 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is K2-75 c?
K2-75 c has a radius of 2.77 times that of Earth.
Is K2-75 c in the Habitable Zone?
K2-75 c orbits inside the inner edge of the habitable zone of K2-75. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of K2-75: 1.244–2.915 AU (conservative: 1.575–2.763 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 ›
Temperature on K2-75 c
K2-75 c receives 138 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on K2-75 c — one full orbit around K2-75 — lasts 18.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.143 AU — closer to its star than Mercury is to the Sun.
How Was K2-75 c Discovered?
K2-75 c was discovered in 2016 using the transit method, with observations from K2.
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 K2-75 c?
K2-75 c is 1,832.8 light-years (561.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,833 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 32,257,280 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. K2-75 c scores 0.23, ranking #3,504 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-75
K2-75
- Surface temperature
- 5,995 K (Sun: 5,772 K)
- Mass
- 1.16 M☉
- Radius
- 1.56 R☉
The K2-75 Planetary System
K2-75 c is one of 2 known planets in the K2-75 system. Its siblings:
- K2-75 b (Mini Neptune)
K2-75 c — Complete Data
| Radius | 2.770 Earth radii (0.247 Jupiter radii) |
|---|---|
| Orbital period | 18.31 days |
| Orbital distance | 0.143 AU |
| Stellar irradiation | 138.00× Earth |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 1,832.8 light-years (561.9 parsecs) |
| Constellation | Aquarius |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-07-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-75 c
Is K2-75 c habitable?
No — K2-75 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is K2-75 c?
K2-75 c is about 1,833 light-years from Earth in the constellation Aquarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 32,257,280 years to get there.
How big is K2-75 c compared to Earth?
K2-75 c has 2.77 times the radius of Earth.
How long is a year on K2-75 c?
One orbit around K2-75 takes 18.3 Earth days — short enough that 20 of its years would fit into one Earth year.
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