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GJ 1002 c

GJ 1002 · M5.5 V host star · cool red dwarf · main sequence

[ GJ_1002_C.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 1002 c: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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15.8 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination1.676° / -7.546°J2000 / ICRS
Gravity1.12 × Earthmodelled estimate
Year21.2 days
From its star0.0738 AUabout 11.0 million km
Stars in the system1 star2 known planets in system
Stars this world orbits1 starOrbits GJ 1002
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 atmosphere195 K · -78°C30% reflective · heat shared
Earth-like air228 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 1002 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 colder GJ 1002 world. Same star, wider orbit: about a quarter of Earth’s light, and the star only about twice the Sun’s width, near 1.0°. Ice is the more likely ground, with dark rock showing through only under the star. An open ocean would need a strong greenhouse that has not been detected.

Dry case. Cold rock and dust. Without air, the day side stays frozen or barely thawed, not a hot desert.

Thick-air case. A thick CO₂ atmosphere is the main way this orbit becomes temperate ground rather than an ice shell. You might see cloud instead of rock.

Walking. About 12% heavier than Earth, modelled. Planet b would appear about a third the Moon’s width. The daylight is dimmer and redder than on b.

Based on: Suárez Mascareño et al. 2023; S 0.26, a 0.074 AU, star angular size 1.0°

[ ORBIT.SYS ]2 KNOWN · ALL SHOWN
100% · Above 30°

GJ 1002 c circles GJ 1002. Also shown: GJ 1002 b, 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.