GJ 682 c
GJ 682 c is a super-Earth orbiting the M3.5 V star GJ 682 in the constellation Scorpius. It lies about 16 light-years from Earth and was discovered in 2014 using the radial velocity method.
Is GJ 682 c in the Habitable Zone?
GJ 682 c orbits beyond the outer edge of the habitable zone of GJ 682. At that distance, any surface water would almost certainly be frozen.
Habitable zone of GJ 682: 0.037–0.098 AU (conservative: 0.047–0.093 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 GJ 682 c — one full orbit around GJ 682 — lasts 57.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.176 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.10).
How Was GJ 682 c Discovered?
GJ 682 c was discovered in 2014 using the radial velocity method, with observations from Multiple Observatories.
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 GJ 682 c?
GJ 682 c is 16.3 light-years (5.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 2010. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 286,880 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. GJ 682 c scores 0.29, ranking #1,833 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 682
GJ 682
- Spectral type
- M3.5 V
- Surface temperature
- 3,028 K (Sun: 5,772 K)
- Mass
- 0.27 M☉
- Luminosity
- 0.0020 L☉
The GJ 682 Planetary System
GJ 682 c is one of 2 known planets in the GJ 682 system. Its siblings:
- GJ 682 b (Super Earth)
GJ 682 c — Complete Data
| Mass (best estimate) | 8.70 Earth masses |
|---|---|
| Orbital period | 57.32 days |
| Orbital distance | 0.176 AU |
| Eccentricity | 0.100 |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 16.3 light-years (5.0 parsecs) |
| Constellation | Scorpius |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2019-10-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 682 c
Is GJ 682 c habitable?
No — GJ 682 c orbits outside the habitable zone of GJ 682 and is likely too cold for liquid water on its surface.
How far away is GJ 682 c?
GJ 682 c is about 16 light-years from Earth in the constellation Scorpius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 286,880 years to get there.
How long is a year on GJ 682 c?
One orbit around GJ 682 takes 57.3 Earth days.
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