EPIC 220674823 c
EPIC 220674823 c is a mini-Neptune orbiting the G5 V star EPIC 220674823 in the constellation Pisces. It lies about 798 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is EPIC 220674823 c?
EPIC 220674823 c has a radius of 2.71 times that of Earth. Its mass is 7.9 times that of Earth, giving it a density of 2.34 g/cm³ — between that of rocky and gaseous planets.
Is EPIC 220674823 c in the Habitable Zone?
EPIC 220674823 c orbits inside the inner edge of the habitable zone of EPIC 220674823. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of EPIC 220674823: 0.701–1.660 AU (conservative: 0.887–1.574 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 220674823 c
The equilibrium temperature of EPIC 220674823 c is about 838 K (565 °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 220674823 c — one full orbit around EPIC 220674823 — lasts 13.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.108 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.18).
How Was EPIC 220674823 c Discovered?
EPIC 220674823 c 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 220674823 c?
EPIC 220674823 c is 797.7 light-years (244.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1229. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,039,520 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 220674823 c scores 0.24, ranking #3,419 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: EPIC 220674823
EPIC 220674823
- Spectral type
- G5 V
- Surface temperature
- 5,578 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.99 R☉
The EPIC 220674823 Planetary System
EPIC 220674823 c is one of 2 known planets in the EPIC 220674823 system. Its siblings:
- EPIC 220674823 b (Lava World)
EPIC 220674823 c — Complete Data
| Radius | 2.712 Earth radii (0.242 Jupiter radii) |
|---|---|
| Mass | 7.90 Earth masses (0.025 Jupiter masses) |
| Density | 2.34 g/cm³ (Earth: 5.51) |
| Orbital period | 13.34 days |
| Orbital distance | 0.108 AU |
| Eccentricity | 0.180 |
| Equilibrium temperature | 838 K (565 °C) |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 797.7 light-years (244.6 parsecs) |
| Constellation | Pisces |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2026-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About EPIC 220674823 c
Is EPIC 220674823 c habitable?
No — EPIC 220674823 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is EPIC 220674823 c?
EPIC 220674823 c is about 798 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,039,520 years to get there.
How big is EPIC 220674823 c compared to Earth?
EPIC 220674823 c has 2.71 times the radius of Earth and about 7.9 times its mass.
How long is a year on EPIC 220674823 c?
One orbit around EPIC 220674823 takes 13.3 Earth days — short enough that 27 of its years would fit into one Earth year.
Explore EPIC 220674823 c in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
