Kepler-432 c
Kepler-432 c is a cold gas giant orbiting Kepler-432 in the constellation Cygnus. It lies about 2,766 light-years from Earth and was discovered in 2015 using the radial velocity method.
Is Kepler-432 c in the Habitable Zone?
The position of Kepler-432 c relative to the habitable zone of Kepler-432 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-432: 2.377–5.748 AU (conservative: 3.011–5.450 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-432 c — one full orbit around Kepler-432 — lasts 406.2 Earth days, longer than an Earth year. Its orbit is highly elliptical (eccentricity 0.50), swinging dramatically closer to and farther from its star.
How Was Kepler-432 c Discovered?
Kepler-432 c was discovered in 2015 using the radial velocity method, with observations from Fred Lawrence Whipple Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is Kepler-432 c?
Kepler-432 c is 2,765.9 light-years (848.0 parsecs) from Earth. Light arriving here tonight left the planet about 2,766 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 48,679,840 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-432 c scores 0.19, ranking #3,949 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-432
Kepler-432 c belongs to a system of 2 stars; it orbits Kepler-432.
Kepler-432
- Surface temperature
- 4,995 K (Sun: 5,772 K)
- Mass
- 1.32 M☉
- Radius
- 4.06 R☉
- Age
- 4.2 billion years (Sun: 4.6)
The Kepler-432 Planetary System
Kepler-432 c is one of 2 known planets in the Kepler-432 system. Its siblings:
- Kepler-432 b (Cold Gas Giant)
Kepler-432 c — Complete Data
| Mass (best estimate) | 772.33 Earth masses |
|---|---|
| Orbital period | 406.20 days |
| Eccentricity | 0.498 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 2,765.9 light-years (848.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Radial Velocity |
| Discovery facility | Fred Lawrence Whipple Observatory |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2015-04-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-432 c
Is Kepler-432 c habitable?
Kepler-432 c is not known to orbit within the habitable zone of Kepler-432, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is Kepler-432 c?
Kepler-432 c is about 2,766 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 48,679,840 years to get there.
How long is a year on Kepler-432 c?
One orbit around Kepler-432 takes 406.2 Earth days.
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