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K2-72 e

K2-72 · M2V host star · cool red dwarf · main sequence

[ K2_72_E.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of K2-72 e: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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216.7 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination334.623° / -9.612°J2000 / ICRS
Gravity1.33 × Earthmodelled estimate
Year24.2 days
From its star0.1060 AUabout 15.9 million km
Stars in the system1 star4 known planets in system
Stars this world orbits1 starOrbits K2-72
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≈3,550 Ktypical M2V · 0.44 Sun radii
No atmosphere319 K · 46°C30% reflective · heat shared
Earth-like air352 K · 79°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

K2-72 is class M2V. 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. One of four small planets. Planet e receives about 1.2 times Earth’s light around a 0.33-solar-radius star spanning about 1.7°. Eccentricity 0.11 moves the flux through the 24-day year. Radius 1.29 Earth radii, mass not truly weighed. Warm rock, ice on the night side, slush under the star only with abundant water.

Dry case. Red dunes, no day-side ice, a hotter spell near periastron.

Thick-air case. Cloud or a thin volatile layer could hide the rock. The radius is still in the rocky-to-water range, not a clear mini-Neptune.

Walking. About 33% heavier than Earth, modelled. K2-72 c would look about 0.4 of the Moon’s width. The star is magnitude 15, 217 light-years away.

Based on: Dressing et al. / NASA composite; Teff 3360 K, R 0.33 Rsun, S 1.2, e 0.11, Rp 1.29, a 0.106 AU

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

K2-72 e circles K2-72. Also shown: K2-72 b, K2-72 c, K2-72 d, 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.