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GJ 1061 c

GJ 1061 · M5.5 V host star · cool red dwarf · main sequence

[ GJ_1061_C.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 1061 c: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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12 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination54.003° / -44.514°J2000 / ICRS
Gravity1.28 × Earthmodelled estimate
Year6.68 days
From its star0.0342 AUabout 5.1 million km
Stars in the system1 star3 known planets in system
Stars this world orbits1 starOrbits GJ 1061
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≈3,000 Ktypical M5.5 V · 0.16 Sun radii
No atmosphere286 K · 13°C30% reflective · heat shared
Earth-like air319 K · 46°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 1061 is class M5.5 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. The inner of the two temperate worlds here. The star is about 2.4° across, nearly five times the Sun’s width, and the planet receives about 1.4 times Earth’s light. The day side is more likely bare dark rock than an ice cap, with frost driven to the night side. A patch of slush under the star is plausible, not a frozen basin.

Dry case. Red dunes and oxidized dust, no day-side ice, heat shimmer. The extra light, compared with Proxima b, makes a dry day side the easier outcome.

Thick-air case. Enough light that a steam or high-CO₂ sky is a real inner-edge risk. You might not see the ground at all.

Walking. About 28% heavier than Earth, from an estimated mass. GJ 1061 b would look about three-quarters the Moon’s width, and GJ 1061 d about half, when each is closest. The star is magnitude 13 from Earth, so this sky is a nearby one, 12 light-years out.

Based on: Dreizler et al. 2020; Teff 2953 K, R 0.156 Rsun, S 1.4, a 0.034 AU

[ ORBIT.SYS ]3 KNOWN · ALL SHOWN
100% · Above 30°

GJ 1061 c circles GJ 1061. Also shown: GJ 1061 b, GJ 1061 d, 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.