EPIC 211822797 b
EPIC 211822797 b is a super-Earth orbiting EPIC 211822797 in the constellation Cancer. It lies about 607 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is EPIC 211822797 b?
EPIC 211822797 b has a radius of 1.92 times that of Earth.
Is EPIC 211822797 b in the Habitable Zone?
EPIC 211822797 b orbits inside the inner edge of the habitable zone of EPIC 211822797. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of EPIC 211822797: 0.232–0.585 AU (conservative: 0.293–0.554 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 ›
Temperature on EPIC 211822797 b
The equilibrium temperature of EPIC 211822797 b is about 431 K (158 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on EPIC 211822797 b — one full orbit around EPIC 211822797 — lasts 21.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.120 AU — closer to its star than Mercury is to the Sun.
How Was EPIC 211822797 b Discovered?
EPIC 211822797 b was discovered in 2016 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 EPIC 211822797 b?
EPIC 211822797 b is 607.3 light-years (186.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1419. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,688,480 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. EPIC 211822797 b scores 0.48, ranking #277 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: EPIC 211822797
EPIC 211822797
- Surface temperature
- 4,057 K (Sun: 5,772 K)
- Mass
- 0.62 M☉
- Radius
- 0.58 R☉
Planetary System
EPIC 211822797 b is the only planet known to orbit EPIC 211822797 so far.
EPIC 211822797 b — Complete Data
| Radius | 1.920 Earth radii (0.171 Jupiter radii) |
|---|---|
| Orbital period | 21.17 days |
| Orbital distance | 0.120 AU |
| Equilibrium temperature | 431 K (158 °C) |
| Earth Similarity Index | 0.48 |
| Distance from Earth | 607.3 light-years (186.2 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About EPIC 211822797 b
Is EPIC 211822797 b habitable?
No — EPIC 211822797 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is EPIC 211822797 b?
EPIC 211822797 b is about 607 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,688,480 years to get there.
How big is EPIC 211822797 b compared to Earth?
EPIC 211822797 b has 1.92 times the radius of Earth.
How long is a year on EPIC 211822797 b?
One orbit around EPIC 211822797 takes 21.2 Earth days — short enough that 17 of its years would fit into one Earth year.
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