K2-80 d
K2-80 d is a mini-Neptune orbiting K2-80 in the constellation Taurus. It lies about 655 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is K2-80 d?
K2-80 d has a radius of 2.55 times that of Earth.
Is K2-80 d in the Habitable Zone?
The position of K2-80 d relative to the habitable zone of K2-80 cannot be precisely determined from the available orbital data.
Habitable zone of K2-80: 0.560–1.335 AU (conservative: 0.709–1.265 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 K2-80 d — one full orbit around K2-80 — lasts 28.9 Earth days, shorter than Mercury's 88-day year.
How Was K2-80 d Discovered?
K2-80 d 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 K2-80 d?
K2-80 d is 654.9 light-years (200.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1372. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,526,240 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. K2-80 d scores 0.33, ranking #933 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-80
K2-80
- Surface temperature
- 5,377 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.84 R☉
The K2-80 Planetary System
K2-80 d is one of 3 known planets in the K2-80 system. Its siblings:
K2-80 d — Complete Data
| Radius | 2.552 Earth radii (0.228 Jupiter radii) |
|---|---|
| Orbital period | 28.87 days |
| Earth Similarity Index | 0.33 |
| Distance from Earth | 654.9 light-years (200.8 parsecs) |
| Constellation | Taurus |
| 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 K2-80 d
Is K2-80 d habitable?
K2-80 d is not known to orbit within the habitable zone of K2-80, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is K2-80 d?
K2-80 d is about 655 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,526,240 years to get there.
How big is K2-80 d compared to Earth?
K2-80 d has 2.55 times the radius of Earth.
How long is a year on K2-80 d?
One orbit around K2-80 takes 28.9 Earth days — short enough that 13 of its years would fit into one Earth year.
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