Nearest neighbour
GJ 357
A red dwarf 31 ly away whose outer world, GJ 357 d, is a super-Earth in the habitable zone.
- Planets
- 3
- Distance
- 30.8 ly
- Host
- M-type
System geometry
At a glance
- Hostname
- GJ 357
- Spectral type
- M2.5 V
- Distance
- 30.8 ly · 9.44 pc
- Stellar mass
- 0.34 M☉
- Stellar radius
- 0.34 R☉
- Luminosity
- 0.016 L☉
- Effective temp
- 3505 K
- Confirmed planets
- 3
- Habitable zone
- 0.120 – 0.173 AU
Top-down orbital diagram
Orbits to scale within this system. Dashed green = habitable-zone edges.
Planet positions are illustrative (evenly spaced in phase). For live motion see the 3D scene.
The planets
3 confirmed.
Rocky world
GJ 357 b
- Orbit
- 0.036 AU
- Period
- 3.93 days
- Radius
- 1.20 R⊕
- Mass
- 1.83 M⊕
- Eq. temperature
- 518 K
- Eccentricity
- 0.000
- Discovered
- 2019 · Transit
Sub-Neptune
GJ 357 c
- Orbit
- 0.061 AU
- Period
- 9.12 days
- Radius
- 1.66 R⊕
- Mass
- 3.40 M⊕
- Eq. temperature
- 401 K
- Eccentricity
- 0.000
- Discovered
- 2019 · Radial Velocity
Sub-Neptune
GJ 357 d
- Orbit
- 0.204 AU
- Period
- 55.66 days
- Radius
- 2.34 R⊕
- Mass
- 6.10 M⊕
- Eq. temperature
- 220 K
- Eccentricity
- 0.000
- Discovered
- 2019 · Radial Velocity
Compared to our Solar System
Each row shows the closest Solar-System analog by radius (log-space). Earth is pinned at the bottom as the constant frame of reference.
| Planet | Radius (R⊕) | Mass (M⊕) | Orbit (AU) | Period (days) | Eq temp (K) | Solar analog |
|---|---|---|---|---|---|---|
| GJ 357 b | 1.20 | 1.83 | 0.036 | 3.93 | 518 | Earth |
| GJ 357 c | 1.66 | 3.40 | 0.061 | 9.12 | 401 | Earth |
| GJ 357 d | 2.34 | 6.10 | 0.204 | 55.66 | 220 | Neptune |
| Earth (reference) | 1.00 | 1.00 | 1.000 | 365.25 | 255 | — |
Research status
◇ JWST observation status
No JWST programs are currently targeting planets in this system. The system may be observed in future cycles or by upcoming missions (Ariel, HWO, Roman).
Discovery timeline
- 2019
3 planets: b, c, d
via Mixed methods
If you liked this
Other systems in the same theme:
Barnard's Star
4 planets · 6.0 ly · M3.5-4 V
Second-closest star system; planet candidates announced 2024 after decades of false starts.
Ross 128
1 planets · 11.0 ly · M4
A quiet red dwarf 11 ly away with a temperate Earth-mass planet.
Tau Ceti
3 planets · 11.8 ly · G8.5V
Sun-like star 12 ly away — three confirmed planets, with the outermost (h) in the habitable zone.
Experience it
See GJ 357 in interactive 3D
Fly through the system, click any planet, watch orbits play out at 100× speed.
▶ Launch 3D scene