K2-368 d
K2-368 d is a super-Earth orbiting K2-368 in the constellation Aquarius. It lies about 674 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is K2-368 d?
K2-368 d has a radius of 1.95 times that of Earth.
Is K2-368 d in the Habitable Zone?
The position of K2-368 d relative to the habitable zone of K2-368 cannot be precisely determined from the available orbital data.
Habitable zone of K2-368: 0.343–0.842 AU (conservative: 0.435–0.798 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 K2-368 d — one full orbit around K2-368 — lasts 20.2 Earth days, shorter than Mercury's 88-day year.
How Was K2-368 d Discovered?
K2-368 d was discovered in 2022 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 K2-368 d?
K2-368 d is 673.9 light-years (206.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1353. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,860,640 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. K2-368 d scores 0.36, ranking #679 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-368
K2-368
- Surface temperature
- 4,663 K (Sun: 5,772 K)
- Mass
- 0.75 M☉
- Radius
- 0.66 R☉
The K2-368 Planetary System
K2-368 d is one of 3 known planets in the K2-368 system. Its siblings:
K2-368 d — Complete Data
| Radius | 1.948 Earth radii (0.174 Jupiter radii) |
|---|---|
| Orbital period | 20.20 days |
| Earth Similarity Index | 0.36 |
| Distance from Earth | 673.9 light-years (206.6 parsecs) |
| Constellation | Aquarius |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-03-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-368 d
Is K2-368 d habitable?
K2-368 d is not known to orbit within the habitable zone of K2-368, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is K2-368 d?
K2-368 d is about 674 light-years from Earth in the constellation Aquarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,860,640 years to get there.
How big is K2-368 d compared to Earth?
K2-368 d has 1.95 times the radius of Earth.
How long is a year on K2-368 d?
One orbit around K2-368 takes 20.2 Earth days — short enough that 18 of its years would fit into one Earth year.
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