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GJ 3323 b

GJ 3323 · M4 host star · cool red dwarf

[ GJ_3323_B.IMG ]
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Artist’s impression of GJ 3323 b: VIEW 1 · ON THE SURFACE
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17.5 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination75.487° / -6.949°J2000 / ICRS
Gravity1.34 × Earthmodelled estimate
Year5.36 days
From its star0.0328 AUabout 4.9 million km
Stars in the system1 star2 known planets in system
Stars this world orbits1 starOrbits GJ 3323
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≈3,300 Ktypical M4 · 0.23 Sun radii
No atmosphere385 K · 112°C30% reflective · heat shared
Earth-like air418 K · 145°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 3323 is class M4. 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 hot end of this catalog. A small star, 0.12 solar radii, still spans about 1.9° because the orbit is tight, and the planet receives about 2.6 times Earth’s light. Eccentricity 0.23 makes the closest approach much brighter still. The day side is hot rock, not an ice cap. Night-side frost is possible only if some volatiles survived.

Dry case. The default picture: oxidized rock, no day-side ice, heat shimmer, and a stripped or very thin sky. This is a red desert that bakes harder every periastron.

Thick-air case. A steam atmosphere is the serious thick-air risk. If the planet ever held a water envelope, the ground may be hidden under cloud or not a solid surface in the usual sense.

Walking. About 34% heavier than Earth, modelled. GJ 3323 c is distant in this sky, only about an eighth of the Moon’s width. The light is the brightest red daylight in the nearby M-dwarf set.

Based on: Astudillo-Defru et al. 2017; Teff 3159 K, R 0.12 Rsun, S 2.58, e 0.23, a 0.033 AU

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

GJ 3323 b circles GJ 3323. Also shown: GJ 3323 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.