Nearest neighbour
GJ 667 C
23 ly away — three to seven candidate planets in a triple-star system.
- Planets
- 5
- Distance
- 23.6 ly
- Host
- M-type
About GJ 667 C
Discovery
GJ 667 C is the M1.5V tertiary component of a hierarchical triple-star system 23 light-years away; multiple planet detections were claimed between 2009 and 2013 (Anglada-Escudé et al.), though several have been contested.
Why it matters
If confirmed, GJ 667 C would host one of the most planet-dense habitable zones known — but Robertson & Mahadevan 2014 showed that activity-driven signals can mimic planets, leaving the architecture genuinely contested.
Current research
Modern precise-RV instruments are slowly disentangling true planets from stellar-activity ghosts in this system; only one or two of the original candidates are robust today.
Comparable to
A red dwarf in a triple-star sky — planets here would see two distant orange suns hanging beside their own.
System geometry
At a glance
- Hostname
- GJ 667 C
- Spectral type
- M1.5 V
- Distance
- 23.6 ly · 7.24 pc
- Stellar mass
- 0.33 M☉
- Stellar radius
- —
- Luminosity
- 0.014 L☉
- Effective temp
- 3350 K
- Confirmed planets
- 5
- Habitable zone
- 0.111 – 0.160 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
5 confirmed.
Sub-Neptune
GJ 667 C b
- Orbit
- 0.050 AU
- Period
- 7.20 days
- Radius
- 2.25 R⊕
- Mass
- 5.68 M⊕
- Eq. temperature
- —
- Eccentricity
- 0.200
- Discovered
- 2012 · Radial Velocity
Sub-Neptune
GJ 667 C c
- Orbit
- 0.125 AU
- Period
- 28.14 days
- Radius
- 1.77 R⊕
- Mass
- 3.80 M⊕
- Eq. temperature
- —
- Eccentricity
- 0.020
- Discovered
- 2013 · Radial Velocity
Rocky world
GJ 667 C f
- Orbit
- 0.156 AU
- Period
- 39.03 days
- Radius
- 1.45 R⊕
- Mass
- 2.70 M⊕
- Eq. temperature
- —
- Eccentricity
- 0.030
- Discovered
- 2013 · Radial Velocity
Rocky world
GJ 667 C e
- Orbit
- 0.213 AU
- Period
- 62.24 days
- Radius
- 1.45 R⊕
- Mass
- 2.70 M⊕
- Eq. temperature
- —
- Eccentricity
- 0.020
- Discovered
- 2013 · Radial Velocity
Sub-Neptune
GJ 667 C g
- Orbit
- 0.549 AU
- Period
- 256.20 days
- Radius
- 1.99 R⊕
- Mass
- 4.60 M⊕
- Eq. temperature
- —
- Eccentricity
- 0.080
- Discovered
- 2013 · 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 667 C b | 2.25 | 5.68 | 0.050 | 7.20 | — | Neptune |
| GJ 667 C c | 1.77 | 3.80 | 0.125 | 28.14 | — | Earth |
| GJ 667 C f | 1.45 | 2.70 | 0.156 | 39.03 | — | Earth |
| GJ 667 C e | 1.45 | 2.70 | 0.213 | 62.24 | — | Earth |
| GJ 667 C g | 1.99 | 4.60 | 0.549 | 256.20 | — | 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
- 2012
GJ 667 C b
via Radial Velocity
- 2013
4 planets: c, f, e, g
via Radial Velocity
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 667 C in interactive 3D
Fly through the system, click any planet, watch orbits play out at 100× speed.
▶ Launch 3D scene