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GJ 1002 b

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

[ GJ_1002_B.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 1002 b: 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
Gravity1.02 × Earthmodelled estimate
Year10.3 days
From its star0.0457 AUabout 6.8 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 atmosphere248 K · -26°C30% reflective · heat shared
Earth-like air281 K · 7°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. A quiet mid-to-late M star, often noted for low flare activity compared with Proxima. Planet b receives about two-thirds of Earth’s light. The star spans about 1.6°. Dark rock under a fixed red sun, frost at the terminator, and a possible small eyeball of slush. This is the warmer of the two GJ 1002 worlds.

Dry case. Red dust and rock, little day-side ice. The quiet star makes a stripped atmosphere less inevitable than around a flare star, but it is not ruled out.

Thick-air case. A thin or modest atmosphere could leave the ground visible. A thick CO₂ deck would hide it under cloud without requiring a steam sky.

Walking. About Earth’s weight, modelled. GJ 1002 c would look a bit over a third of the Moon’s width at closest approach. The system is 16 light-years away, star magnitude 14.

Based on: Suárez Mascareño et al. 2023; Teff 3024 K, R 0.137 Rsun, S 0.67, a 0.046 AU

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

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