GJ 3512 c
GJ 3512 c is a cold gas giant orbiting the M5.5 V star GJ 3512 in the constellation Ursa Major. It lies about 31 light-years from Earth and was discovered in 2020 using the radial velocity method.
Is GJ 3512 c in the Habitable Zone?
GJ 3512 c orbits beyond the outer edge of the habitable zone of GJ 3512. At that distance, any surface water would almost certainly be frozen.
Habitable zone of GJ 3512: 0.034–0.089 AU (conservative: 0.043–0.084 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 3512 c — one full orbit around GJ 3512 — lasts 2,354.0 Earth days, longer than an Earth year. It orbits at an average distance of 1.731 AU. Its orbit is mildly elliptical (eccentricity 0.09).
How Was GJ 3512 c Discovered?
GJ 3512 c was discovered in 2020 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 3512 c?
GJ 3512 c is 30.9 light-years (9.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1996. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 543,840 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. GJ 3512 c scores 0.09, ranking #4,496 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 3512
GJ 3512
- Spectral type
- M5.5 V
- Surface temperature
- 3,141 K (Sun: 5,772 K)
- Mass
- 0.12 M☉
- Radius
- 0.14 R☉
The GJ 3512 Planetary System
GJ 3512 c is one of 2 known planets in the GJ 3512 system. Its siblings:
- GJ 3512 b (Cold Gas Giant)
GJ 3512 c — Complete Data
| Mass (best estimate) | 143.98 Earth masses |
|---|---|
| Orbital period | 2,354.00 days |
| Orbital distance | 1.731 AU |
| Eccentricity | 0.089 |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 30.9 light-years (9.5 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2025-08-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 3512 c
Is GJ 3512 c habitable?
No — GJ 3512 c orbits outside the habitable zone of GJ 3512 and is likely too cold for liquid water on its surface.
How far away is GJ 3512 c?
GJ 3512 c is about 31 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 543,840 years to get there.
How long is a year on GJ 3512 c?
One orbit around GJ 3512 takes 2,354.0 Earth days.
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