K2-35 b
K2-35 b is a super-Earth orbiting K2-35 in the constellation Leo. It lies about 824 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is K2-35 b?
K2-35 b has a radius of 1.32 times that of Earth.
Is K2-35 b in the Habitable Zone?
K2-35 b orbits inside the inner edge of the habitable zone of K2-35. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of K2-35: 0.289–0.716 AU (conservative: 0.366–0.679 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 K2-35 b
K2-35 b receives 211 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on K2-35 b — one full orbit around K2-35 — lasts 2.40 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.031 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.13).
How Was K2-35 b Discovered?
K2-35 b 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 K2-35 b?
K2-35 b is 823.9 light-years (252.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1203. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,500,640 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. K2-35 b scores 0.29, ranking #1,581 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-35
K2-35
- Surface temperature
- 4,403 K (Sun: 5,772 K)
- Mass
- 0.70 M☉
- Radius
- 0.62 R☉
The K2-35 Planetary System
K2-35 b is one of 2 known planets in the K2-35 system. Its siblings:
- K2-35 c (Super Earth)
K2-35 b — Complete Data
| Radius | 1.320 Earth radii (0.118 Jupiter radii) |
|---|---|
| Orbital period | 2.40 days |
| Orbital distance | 0.031 AU |
| Eccentricity | 0.130 |
| Stellar irradiation | 211.00× Earth |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 823.9 light-years (252.6 parsecs) |
| Constellation | Leo |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2020-10-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-35 b
Is K2-35 b habitable?
No — K2-35 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is K2-35 b?
K2-35 b is about 824 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,500,640 years to get there.
How big is K2-35 b compared to Earth?
K2-35 b has 1.32 times the radius of Earth.
How long is a year on K2-35 b?
One orbit around K2-35 takes 2.4 Earth days — short enough that 152 of its years would fit into one Earth year.
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