GJ 3323 c
GJ 3323 c is a super-Earth orbiting the M4 star GJ 3323 in the constellation Eridanus. It lies about 18 light-years from Earth and was discovered in 2017 using the radial velocity method.
Is GJ 3323 c in the Habitable Zone?
GJ 3323 c orbits beyond the outer edge of the habitable zone of GJ 3323. At that distance, any surface water would almost certainly be frozen.
Habitable zone of GJ 3323: 0.043–0.113 AU (conservative: 0.054–0.107 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on GJ 3323 c
GJ 3323 c receives 0.17 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on GJ 3323 c — one full orbit around GJ 3323 — lasts 40.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.126 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was GJ 3323 c Discovered?
GJ 3323 c was discovered in 2017 using the radial velocity method, with observations from La Silla 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 GJ 3323 c?
GJ 3323 c is 17.5 light-years (5.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 2009. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 308,000 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 3323 c scores 0.49, ranking #261 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 3323
GJ 3323
- Spectral type
- M4
- Surface temperature
- 3,159 K (Sun: 5,772 K)
- Mass
- 0.16 M☉
- Radius
- 0.12 R☉
- Luminosity
- 0.0027 L☉
The GJ 3323 Planetary System
GJ 3323 c is one of 2 known planets in the GJ 3323 system. Its siblings:
- GJ 3323 b (Super Earth)
GJ 3323 c — Complete Data
| Mass (best estimate) | 2.31 Earth masses |
|---|---|
| Orbital period | 40.54 days |
| Orbital distance | 0.126 AU |
| Eccentricity | 0.170 |
| Stellar irradiation | 0.17× Earth |
| Earth Similarity Index | 0.49 |
| Distance from Earth | 17.5 light-years (5.4 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-03-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 3323 c
Is GJ 3323 c habitable?
No — GJ 3323 c orbits outside the habitable zone of GJ 3323 and is likely too cold for liquid water on its surface.
How far away is GJ 3323 c?
GJ 3323 c is about 18 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 308,000 years to get there.
How long is a year on GJ 3323 c?
One orbit around GJ 3323 takes 40.5 Earth days.
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