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TOI-700 d

TOI-700 · M2.5 V host star · cool red dwarf · main sequence

[ TOI_700_D.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of TOI-700 d: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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101.5 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination97.096° / -65.579°J2000 / ICRS
Gravity1.80 × Earthderived from measured mass + radius
Year37.4 days
From its star0.1633 AUabout 24.4 million km
Stars in the system1 star4 known planets in system
Stars this world orbits1 starOrbits TOI-700
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≈3,500 Ktypical M2.5 V · 0.40 Sun radii
No atmosphere242 K · -32°C30% reflective · heat shared
Earth-like air275 K · 1°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

TOI-700 is class M2.5 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 weighed rocky world. ESPRESSO finds about 2.40 Earth masses and 1.16 Earth radii, density near 8.5 g/cm³, so the mix is rock with more iron than Earth. Gravity is 1.80 g, measured. It receives about 85% of Earth’s light around a quiet M2.5 star, 0.41 solar radii, spanning about 1.3°. Dark rock under a fixed red star, night-side ice, a possible slush patch under the star. The star is unusually quiet for an M dwarf, which matters for whether air survives.

Dry case. Iron-rich rock and dust, dunes, no day-side ice. A dry version of this planet is still a heavy red desert, not an ice ball.

Thick-air case. The mass rules out a big hydrogen envelope. A secondary atmosphere, nitrogen or CO₂, could still cover the ground in cloud. JWST can test that; it has not photographed the surface.

Walking. About 80% heavier than Earth, measured. You would feel it in the legs. TOI-700 e would look about a third of the Moon’s width. The light is red and a bit under Earth’s energy. The star is magnitude 13, 102 light-years away.

Based on: Gilbert et al. ESPRESSO 2024/2025; Mp 2.40, Rp 1.156, g 1.80; Teff 3459 K, R 0.41 Rsun, S 0.85, a 0.164 AU

[ ORBIT.SYS ]4 KNOWN · ALL SHOWN
100% · Above 30°

TOI-700 d circles TOI-700. Also shown: TOI-700 b, TOI-700 c, TOI-700 e, 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.