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TOI-715 b

TOI-715 · M4 host star · cool red dwarf

[ TOI_715_B.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of TOI-715 b: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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138.3 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination113.852° / -73.577°J2000 / ICRS
Gravity1.26 × Earthmodelled estimate
Year19.3 days
From its star0.0830 AUabout 12.4 million km
Stars in the system1 star1 known planet in system
Stars this world orbits1 starOrbits TOI-715
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 atmosphere242 K · -31°C30% reflective · heat shared
Earth-like air275 K · 2°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-715 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. A 1.55-Earth-radius planet around a 0.24-solar-radius star, receiving about two-thirds of Earth’s light. The star spans about 1.5°. No other planet is known here. The mass in the archive is a filled-in estimate, so the page’s 1.26 g is a model. Cool red daylight, dark rock, frost at the night side, a possible water patch under the star. A 1.55-radius world can still be rocky or can carry a water layer.

Dry case. Red rock and dust. The flux is too low for a scorched inner-edge desert and high enough that a thin-air day side is not an ice sheet.

Thick-air case. A water-rich envelope or a CO₂ sky could hide the ground. The radius allows either a rock or a volatile layer.

Walking. About 26% heavier than Earth if the model mass is right. No known neighbor in the sky. The light is dim and red. The star is magnitude 17, 138 light-years away.

Based on: Dransfield et al. 2024; Teff 3075 K, R 0.24 Rsun, S 0.67, Rp 1.55, a 0.083 AU. The archive mass has no uncertainty and is not a measured mass.

[ ORBIT.SYS ]1 KNOWN · ALL SHOWN
100% · Above 30°

TOI-715 b circles TOI-715. 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.