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LP 890-9 c

LP 890-9 · M6 V host star · cool red dwarf · main sequence

[ LP_890_9_C.IMG ]
VIEW 1 · ON THE SURFACE
1 / 2
Artist’s impression of LP 890-9 c: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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105.8 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination64.131° / -28.316°J2000 / ICRS
Gravity1.69 × Earthmodelled estimate
Year8.46 days
From its star0.0398 AUabout 6.0 million km
Stars in the system1 star2 known planets in system
Stars this world orbits1 starOrbits LP 890-9
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≈2,850 Ktypical M6 V · 0.15 Sun radii
No atmosphere244 K · -29°C30% reflective · heat shared
Earth-like air277 K · 4°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

LP 890-9 is class M6 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 late M star, 2850 K, 0.16 solar radii, spanning about 2.1° from this 8.5-day orbit. The planet receives about 90% of Earth’s light. Radius 1.37 Earth radii. The archive mass is an upper limit, not a weighed planet, so the page’s 1.69 g is a model, not a scale reading. Dark rock under a large red star, ice on the night side, a possible water patch under the star.

Dry case. Red rock and dust, warm day side, ice only if a cold trap on the night side still holds water.

Thick-air case. Clouds could hide the ground. A hydrogen sky is not required by the radius, and the mass limit is too loose to prove one.

Walking. Heavier than Earth if the model mass holds, about 70% more, and that number can move. LP 890-9 b would look about 0.6 of the Moon’s width. The star is magnitude 18, 106 light-years away, a faint host in our sky and a huge red disk in its own.

Based on: Delrez et al. 2022; Teff 2850 K, R 0.16 Rsun, S 0.91, a 0.040 AU, Rp 1.37. Archive mass 25 Earth masses is an upper limit, not a measurement.

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

LP 890-9 c circles LP 890-9. Also shown: LP 890-9 b, 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.