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GJ 667 C f

GJ 667 C · M1.5 V host star · cool red dwarf · main sequence · existence disputed

[ GJ_667_C_F.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 667 C f: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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23.6 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination259.751° / -34.998°J2000 / ICRS
Gravity1.28 × Earthmodelled estimate
Year39 days
From its star0.1560 AUabout 23.3 million km. GJ 667 A and GJ 667 B ≥230 AU from GJ 667 C; those two are 5–20 AU apart
Stars in the system3 stars5 known planets in system
Stars this world orbits1 starOrbits GJ 667 C; not circumbinary
Day and nightLikely synchronous spinProbably spins once per orbit, keeping one hemisphere in permanent day and the other in permanent night. Heuristic: likely at ≤0.25 AU, uncertain to 0.50 AU, probably not beyond; rotation is not directly measured.
[ TEMP.EST ]MODELLED, NOT MEASURED
Host star≈3,650 Ktypical M1.5 V · 0.49 Sun radii
No atmosphere285 K · 12°C30% reflective · heat shared
Earth-like air318 K · 45°CBaseline plus 33°C

Star temperature and orbital distance set incoming energy, but stellar size is also required. This calculation uses a typical radius for the listed spectral type, 30% reflectivity and even heat redistribution. It is not a ground-temperature forecast: air, clouds, oceans and surface reflectivity could move the result by tens to hundreds of degrees. A likely synchronous spin also means the permanent day and night sides would not share one ground temperature.

[ STARLIGHT.SPC ]VISIBLE LIGHT ONLY

The marker above the bar is a typical temperature for this star’s class. The line below is Earth’s Sun.

red-orange

GJ 667 C is class M1.5 V. Its visible daylight would be dim and strongly red-orange; most of its energy is infrared.

Representative lit-side geometry only. On a locked world, the star’s real elevation would depend on where you stand.

[ GROUND.TXT ]STILL INFERENCE

Most plausible case. Also disputed. If it is real, it sits between c and e and receives about 56% of Earth’s light. The star would span a bit over a degree. Cooler than planet c: more frost on the day side, ice on the night side, open water only under the star and only with greenhouse warming. Treat the picture as provisional.

Dry case. Cold red rock, not a dune field baked by an inner-edge flux.

Thick-air case. CO₂ cloud or a clear cold sky. A steam atmosphere is not the likely thick-air end at this flux.

Walking. About 28% heavier than Earth, modelled, and only if the signal survives. Planet c would look about half the Moon’s width at closest approach, the largest neighbor in this system.

Based on: Anglada-Escudé et al. 2013; contested; S 0.56, a 0.156 AU, controversial flag

[ ORBIT.SYS ]5 KNOWN · ALL SHOWN
100% · Above 30°

GJ 667 C f circles GJ 667 C alone. GJ 667 C is at least 230 AU from the A–B pair; A and B vary from about 5 to 20 AU apart. Also shown: GJ 667 C b, GJ 667 C c, GJ 667 C e, GJ 667 C g, each on its NASA-catalogued orbit. Use Higher and Lower to move your viewpoint above, through and below the orbital plane, and − / + to zoom. Orbit shapes and spacing are schematic.

[ SOURCES.TXT ]

Positions, distances, and system parameters come from the NASA Exoplanet Archive composite table, queried 25 Sep 2026. GJ 273 b uses the parallax in that row, 12.4 light-years. The 45 worlds follow Bohl, Lawrence, Lowry, and Kaltenegger.