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GJ 682 b

GJ 682 · M3.5 V host star · cool red dwarf · main sequence

[ GJ_682_B.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 682 b: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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16.3 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination264.261° / -44.323°J2000 / ICRS
Gravity1.18 × Earthmodelled estimate
Year17.5 days
From its star0.0800 AUabout 12.0 million km
Stars in the system1 star2 known planets in system
Stars this world orbits1 starOrbits GJ 682
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≈3,400 Ktypical M3.5 V · 0.30 Sun radii
No atmosphere290 K · 17°C30% reflective · heat shared
Earth-like air323 K · 50°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 682 is class M3.5 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 large estimated radius, near 1.9 Earth radii, around a 0.30-solar-radius star. From 0.08 AU the star spans about 2.0°, but the planet receives only about a third of Earth’s light. If it is rocky, expect a cold day side of dark rock and widespread frost. The radius is modelled from a minimum mass, so it may be smaller and denser than that estimate.

Dry case. Cold dust and rock. A hot dune field does not fit a flux this low unless the estimate of the light is badly high.

Thick-air case. Greenhouse warming is what would turn this from an ice world into exposed ground. A cloudy CO₂ sky is the thick-air picture.

Walking. About 18% heavier than Earth, modelled. GJ 682 c is a small disk, about a quarter of the Moon’s width. Eccentricity is only about 0.08, so the light does not swing wildly.

Based on: NASA composite; Teff 3028 K, R 0.30 Rsun, S 0.31, a 0.08 AU, estimated radius 1.9 Rearth

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

GJ 682 b circles GJ 682. Also shown: GJ 682 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.