K2-165 b
K2-165 b is a super-Earth orbiting K2-165 in the constellation Virgo. It lies about 439 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is K2-165 b?
K2-165 b has a radius of 1.27 times that of Earth.
Is K2-165 b in the Habitable Zone?
The position of K2-165 b relative to the habitable zone of K2-165 cannot be precisely determined from the available orbital data.
Habitable zone of K2-165: 0.502–1.206 AU (conservative: 0.636–1.143 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 K2-165 b — one full orbit around K2-165 — lasts 2.35 Earth days, shorter than Mercury's 88-day year.
How Was K2-165 b Discovered?
K2-165 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 K2-165 b?
K2-165 b is 439.0 light-years (134.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1587. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,726,400 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. K2-165 b scores 0.29, ranking #1,778 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-165
K2-165
- Surface temperature
- 5,185 K (Sun: 5,772 K)
- Mass
- 0.83 M☉
- Radius
- 0.80 R☉
The K2-165 Planetary System
K2-165 b is one of 3 known planets in the K2-165 system. Its siblings:
K2-165 b — Complete Data
| Radius | 1.274 Earth radii (0.114 Jupiter radii) |
|---|---|
| Orbital period | 2.35 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 439.0 light-years (134.6 parsecs) |
| Constellation | Virgo |
| 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 K2-165 b
Is K2-165 b habitable?
K2-165 b is not known to orbit within the habitable zone of K2-165, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is K2-165 b?
K2-165 b is about 439 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,726,400 years to get there.
How big is K2-165 b compared to Earth?
K2-165 b has 1.27 times the radius of Earth.
How long is a year on K2-165 b?
One orbit around K2-165 takes 2.4 Earth days — short enough that 155 of its years would fit into one Earth year.
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