Kepler-418 c
Kepler-418 c is a Neptune-like planet orbiting Kepler-418 in the constellation Cygnus. It lies about 3,270 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-418 c?
Kepler-418 c has a radius of 5.22 times that of Earth.
Is Kepler-418 c in the Habitable Zone?
The position of Kepler-418 c relative to the habitable zone of Kepler-418 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-418: 0.828–1.948 AU (conservative: 1.049–1.847 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 Kepler-418 c — one full orbit around Kepler-418 — lasts 12.2 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-418 c Discovered?
Kepler-418 c was discovered in 2021 using the transit method, with observations from Kepler.
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 Kepler-418 c?
Kepler-418 c is 3,269.8 light-years (1,002.5 parsecs) from Earth. Light arriving here tonight left the planet about 3,270 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 57,548,480 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. Kepler-418 c scores 0.15, ranking #4,184 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-418
Kepler-418
- Surface temperature
- 5,820 K (Sun: 5,772 K)
- Mass
- 0.98 M☉
- Radius
- 1.09 R☉
- Age
- 7.0 billion years (Sun: 4.6)
The Kepler-418 Planetary System
Kepler-418 c is one of 2 known planets in the Kepler-418 system. Its siblings:
- Kepler-418 b (Cold Gas Giant)
Kepler-418 c — Complete Data
| Radius | 5.221 Earth radii (0.466 Jupiter radii) |
|---|---|
| Orbital period | 12.22 days |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 3,269.8 light-years (1,002.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-418 c
Is Kepler-418 c habitable?
Kepler-418 c is not known to orbit within the habitable zone of Kepler-418, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is Kepler-418 c?
Kepler-418 c is about 3,270 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 57,548,480 years to get there.
How big is Kepler-418 c compared to Earth?
Kepler-418 c has 5.22 times the radius of Earth.
How long is a year on Kepler-418 c?
One orbit around Kepler-418 takes 12.2 Earth days — short enough that 30 of its years would fit into one Earth year.
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