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Kepler-442 b

Kepler-442 · K5V host star · orange star · main sequence

[ KEPLER_442_B.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of Kepler-442 b: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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1,193.6 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination285.367° / 39.280°J2000 / ICRS
Gravity1.31 × Earthmodelled estimate
Year112.3 days
From its star0.4090 AUabout 61.2 million km
Stars in the system1 star1 known planet in system
Stars this world orbits1 starOrbits Kepler-442
Day and nightSpin state unknownIts rotation has not been measured, so we do not know whether it has a normal day/night cycle. 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 atmosphere254 K · -19°C30% reflective · heat shared
Earth-like air287 K · 14°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-442 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 K star, 4400 K, 0.60 solar radii. From 0.41 AU it spans about 0.8°, and the planet receives about two-thirds of Earth’s light. Radius 1.34 Earth radii, one of the more Earth-like sizes among the Kepler K-dwarf hosts. Orange daylight, rock and seasonal or night-side ice, spin uncertain on a 112-day orbit. Often cited as one of the more Earth-similar Kepler planets on flux and size, which is not a detection of oceans.

Dry case. Temperate-to-cool rock and dust under an orange sun. Less frozen than Kepler-441 b, less baked than Kepler-452 b.

Thick-air case. A CO₂ or water-rich sky could cloud the ground. The radius does not require it.

Walking. About 31% heavier than Earth, modelled. No known sibling planet. The star is magnitude 15, about 1,200 light-years away.

Based on: Torres et al. 2015; Teff 4402 K, R 0.60 Rsun, S 0.66, Rp 1.34, a 0.409 AU

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

Kepler-442 b circles Kepler-442. 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.