K2-164 b
K2-164 b is a sub-Neptune orbiting K2-164 in the constellation Leo. It lies about 1,225 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is K2-164 b?
K2-164 b has a radius of 3.25 times that of Earth.
Is K2-164 b in the Habitable Zone?
The position of K2-164 b relative to the habitable zone of K2-164 cannot be precisely determined from the available orbital data.
Habitable zone of K2-164: 1.654–3.896 AU (conservative: 2.095–3.694 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 K2-164 b — one full orbit around K2-164 — lasts 17.4 Earth days, shorter than Mercury's 88-day year.
How Was K2-164 b Discovered?
K2-164 b was discovered in 2018 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 K2-164 b?
K2-164 b is 1,225.3 light-years (375.7 parsecs) from Earth. Light arriving here tonight left the planet about 1,225 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,565,280 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. K2-164 b scores 0.21, ranking #3,828 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-164
K2-164
- Surface temperature
- 5,791 K (Sun: 5,772 K)
- Mass
- 1.18 M☉
- Radius
- 2.20 R☉
Planetary System
K2-164 b is the only planet known to orbit K2-164 so far.
K2-164 b — Complete Data
| Radius | 3.249 Earth radii (0.290 Jupiter radii) |
|---|---|
| Orbital period | 17.36 days |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 1,225.3 light-years (375.7 parsecs) |
| Constellation | Leo |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-02-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-164 b
Is K2-164 b habitable?
K2-164 b is not known to orbit within the habitable zone of K2-164, and as a sub-Neptune it is an unlikely candidate for life as we know it.
How far away is K2-164 b?
K2-164 b is about 1,225 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,565,280 years to get there.
How big is K2-164 b compared to Earth?
K2-164 b has 3.25 times the radius of Earth.
How long is a year on K2-164 b?
One orbit around K2-164 takes 17.4 Earth days — short enough that 21 of its years would fit into one Earth year.
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