EPIC 211945201 b
EPIC 211945201 b is a Neptune-like planet orbiting EPIC 211945201 in the constellation Cancer. It lies about 593 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is EPIC 211945201 b?
EPIC 211945201 b has a radius of 5.76 times that of Earth, or 0.51 times the radius of Jupiter.
Is EPIC 211945201 b in the Habitable Zone?
EPIC 211945201 b orbits inside the inner edge of the habitable zone of EPIC 211945201. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of EPIC 211945201: 1.131–2.645 AU (conservative: 1.432–2.508 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 211945201 b
The equilibrium temperature of EPIC 211945201 b is about 817 K (544 °C) — hot enough to melt many metals. 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 211945201 b — one full orbit around EPIC 211945201 — lasts 19.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.149 AU — closer to its star than Mercury is to the Sun.
How Was EPIC 211945201 b Discovered?
EPIC 211945201 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 EPIC 211945201 b?
EPIC 211945201 b is 592.6 light-years (181.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1434. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,429,760 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 211945201 b scores 0.15, ranking #4,231 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: EPIC 211945201
EPIC 211945201
- Surface temperature
- 6,069 K (Sun: 5,772 K)
- Mass
- 1.17 M☉
- Radius
- 1.39 R☉
Planetary System
EPIC 211945201 b is the only planet known to orbit EPIC 211945201 so far.
EPIC 211945201 b — Complete Data
| Radius | 5.760 Earth radii (0.514 Jupiter radii) |
|---|---|
| Orbital period | 19.49 days |
| Orbital distance | 0.149 AU |
| Equilibrium temperature | 817 K (544 °C) |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 592.6 light-years (181.7 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2018-10-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About EPIC 211945201 b
Is EPIC 211945201 b habitable?
No — EPIC 211945201 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is EPIC 211945201 b?
EPIC 211945201 b is about 593 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,429,760 years to get there.
How big is EPIC 211945201 b compared to Earth?
EPIC 211945201 b has 5.76 times the radius of Earth.
How long is a year on EPIC 211945201 b?
One orbit around EPIC 211945201 takes 19.5 Earth days — short enough that 19 of its years would fit into one Earth year.
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