K2-370 b
K2-370 b is a super-Earth orbiting the G5 V star K2-370 in the constellation Taurus. It lies about 470 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is K2-370 b?
K2-370 b has a radius of 2.67 times that of Earth. Its mass is 11.1 times that of Earth, giving it a density of 3.20 g/cm³ — between that of rocky and gaseous planets.
Is K2-370 b in the Habitable Zone?
K2-370 b orbits inside the inner edge of the habitable zone of K2-370. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of K2-370: 0.686–1.621 AU (conservative: 0.869–1.537 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 ›
Orbit and Year Length
A year on K2-370 b — one full orbit around K2-370 — lasts 2.14 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.032 AU — closer to its star than Mercury is to the Sun.
How Was K2-370 b Discovered?
K2-370 b was discovered in 2022 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 K2-370 b?
K2-370 b is 470.3 light-years (144.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1556. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,277,280 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. K2-370 b scores 0.20, ranking #3,849 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-370
K2-370
- Spectral type
- G5 V
- Surface temperature
- 5,662 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 0.95 R☉
- Age
- 1.4 billion years (Sun: 4.6)
Planetary System
K2-370 b is the only planet known to orbit K2-370 so far.
K2-370 b — Complete Data
| Radius | 2.670 Earth radii (0.238 Jupiter radii) |
|---|---|
| Mass | 11.10 Earth masses (0.035 Jupiter masses) |
| Density | 3.20 g/cm³ (Earth: 5.51) |
| Orbital period | 2.14 days |
| Orbital distance | 0.032 AU |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 470.3 light-years (144.2 parsecs) |
| Constellation | Taurus |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2026-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-370 b
Is K2-370 b habitable?
No — K2-370 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is K2-370 b?
K2-370 b is about 470 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,277,280 years to get there.
How big is K2-370 b compared to Earth?
K2-370 b has 2.67 times the radius of Earth and about 11.1 times its mass.
How long is a year on K2-370 b?
One orbit around K2-370 takes 2.1 Earth days — short enough that 171 of its years would fit into one Earth year.
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