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Kepler-441 b

Kepler-441 · K5V host star · orange star · main sequence

[ KEPLER_441_B.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of Kepler-441 b: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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874.1 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination284.567° / 49.013°J2000 / ICRS
Gravity1.24 × Earthmodelled estimate
Year207.2 days
From its star0.6400 AUabout 95.7 million km
Stars in the system1 star1 known planet in system
Stars this world orbits1 starOrbits Kepler-441
Day and nightProbably has a day/night cycleIt likely rotates relative to its star, but its rotation period has not been measured. 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≈4,400 Ktypical K5V · 0.70 Sun radii
No atmosphere203 K · -70°C30% reflective · heat shared
Earth-like air236 K · -37°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.

[ 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.

orange-gold

Kepler-441 is class K5V. Its daylight would have a warmer orange-gold cast than sunlight on Earth.

Representative daytime geometry only; the star’s height in the sky changes through the day.

[ GROUND.TXT ]STILL INFERENCE

Most plausible case. A cold K-dwarf orbit. The star is 4340 K and 0.55 solar radii, and from 0.64 AU it spans only about 0.46°, slightly smaller than the Sun looks from Earth. The planet receives about a fifth of Earth’s light. That is outer-edge dim. Ice and frost are the plausible ground. The 207-day year makes a fixed dayside unlikely. Radius 1.64 Earth radii, mass modelled.

Dry case. Frozen rock. Not a desert of heat shimmer.

Thick-air case. A thick CO₂ sky is the paper habitability story for a flux this low. It would hide the ground under cloud and is not observed.

Walking. About 24% heavier than Earth, modelled. No known neighbor. Daylight is orange and faint, a small sun in a cold sky. The star is magnitude 16, about 880 light-years away.

Based on: NASA composite; Teff 4340 K, R 0.55 Rsun, S 0.21, Rp 1.64, a 0.64 AU

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

Kepler-441 b circles Kepler-441. 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.