Kepler-442 b
Often ranked the single best habitability candidate around a K-dwarf.
K5 orange dwarf · orbits Kepler-442 · discovered 2015
The exact inputs the model saw
14 features, in the model's own order: your 4 profile preferences, then this world's 10 published physical parameters.
| feature | wire name | value | unit |
|---|---|---|---|
| Preferred star temperatureyours | prof_target_teff | 4400 | K |
| Preferred sunlightyours | prof_target_insol | 1 | × Earth |
| Max distanceyours | prof_max_dist | 150 | light-years |
| Size preferenceyours | prof_size_focus | 1 | Earth radii |
| Planet radius | pl_rade | 1.34 | Earth radii |
| Planet mass | pl_masse | 2.36* | Earth masses |
| Equilibrium temperature | pl_eqt | 233 | K |
| Sunlight received | pl_insol | 0.7 | × Earth flux |
| Orbital period | pl_orbper | 112.3 | days |
| Orbit semi-major axis | pl_orbsmax | 0.409 | AU |
| Star temperature | st_teff | 4402 | K |
| Star radius | st_rad | 0.6 | Solar radii |
| Star mass | st_mass | 0.61 | Solar masses |
| Distance from Earth | sys_dist | 1206 | light-years |
*published mass–radius estimate — no radial-velocity mass measured yet.
From the research corpus
Passages that ship inside the model's IPFS bundle — real citations, content-addressed with the model itself.
“Kepler-442b is a confirmed super-Earth that orbits Kepler-442, a K-type main-sequence (orange dwarf) star cooler than the Sun, with a stellar effective temperature near 4,400 kelvin, a mass of about 0.61 solar masses, and a radius of about 0.60 solar radii. The planet lies about 1,196 light-years away and was confirmed by NASA's Kepler spacecraft on 6 January 2015 via the transit method. Kepler-442b has a radius of roughly 1.34 Earth…”
Kepler-442b · Physical and orbital parameters
“Kepler-442b is frequently cited as the most Earth-like exoplanet by similarity metrics. It has an Earth Similarity Index of about 0.84, placing it near the top of similarity rankings, and a 2015 habitability index assigned it a rating of about 0.836, marginally above the value of 0.829 computed for Earth in that same index. The index authors cautioned that exceeding Earth's value does not mean the planet is more habitable than Earth;…”
Kepler-442b · Earth Similarity Index and habitability rating
“A study published in the Monthly Notices of the Royal Astronomical Society assessed whether known habitable-zone planets receive enough stellar radiation to power a substantial biosphere through photosynthesis, which is considered important for building an oxygen-rich atmosphere. Kepler-442b was found to receive close to enough radiation from its star to sustain a large biosphere, a notable result given that its K-dwarf host is cooler…”
The host stars of Kepler's habitable exoplanets: superflares, rotation and activity · Photosynthetic energy budget and biosphere potential