K2-223 c
K2-223 c is a super-Earth orbiting K2-223 in the constellation Virgo. It lies about 648 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is K2-223 c?
K2-223 c has a radius of 1.50 times that of Earth.
Is K2-223 c in the Habitable Zone?
The position of K2-223 c relative to the habitable zone of K2-223 cannot be precisely determined from the available orbital data.
Habitable zone of K2-223: 0.768–1.805 AU (conservative: 0.973–1.712 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 K2-223 c — one full orbit around K2-223 — lasts 4.56 Earth days, shorter than Mercury's 88-day year.
How Was K2-223 c Discovered?
K2-223 c 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 K2-223 c?
K2-223 c is 647.8 light-years (198.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1379. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,401,280 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. K2-223 c scores 0.28, ranking #2,134 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-223
K2-223
- Surface temperature
- 5,859 K (Sun: 5,772 K)
- Radius
- 1.00 R☉
The K2-223 Planetary System
K2-223 c is one of 2 known planets in the K2-223 system. Its siblings:
- K2-223 b (Terrestrial)
K2-223 c — Complete Data
| Radius | 1.500 Earth radii (0.134 Jupiter radii) |
|---|---|
| Orbital period | 4.56 days |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 647.8 light-years (198.6 parsecs) |
| Constellation | Virgo |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2022-03-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-223 c
Is K2-223 c habitable?
K2-223 c is not known to orbit within the habitable zone of K2-223, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is K2-223 c?
K2-223 c is about 648 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,401,280 years to get there.
How big is K2-223 c compared to Earth?
K2-223 c has 1.50 times the radius of Earth.
How long is a year on K2-223 c?
One orbit around K2-223 takes 4.6 Earth days — short enough that 80 of its years would fit into one Earth year.
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