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GJ 1061 d

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

[ GJ_1061_D.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 1061 d: VIEW 1 · ON THE SURFACE
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12 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination54.003° / -44.514°J2000 / ICRS
Gravity1.24 × Earthmodelled estimate
Year13.1 days
From its star0.0540 AUabout 8.1 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 atmosphere228 K · -45°C30% reflective · heat shared
Earth-like air261 K · -12°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 cooler sibling of GJ 1061 c, on a wider orbit that receives about 60% of Earth’s light. The same red star is smaller here, about 1.5° across. Dark rock under the star, with a broader field of frost, and ice more likely to reach the day side than on planet c.

Dry case. Still a red desert if the air is thin, but the day side is less scorched than on c. Night-side ice would be the larger store of water.

Thick-air case. A modest atmosphere could keep a twilight belt mild. A very thick CO₂ sky would hide the ground under cloud rather than turn the dayside to steam.

Walking. About 24% heavier than Earth, modelled. GJ 1061 c would appear a bit over half the Moon’s width at closest approach. The light is dimmer than on c and still mostly infrared.

Based on: Dreizler et al. 2020; S 0.60, a 0.054 AU, star angular size 1.5°

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

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