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K2-257 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/K2-257 b

Confirmed exoplanet · Terrestrial

K2-257 b

Orbiting K2-257

Discovered in 2018 using Transit. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic terrestrial catalog artwork; not a direct image of K2-257 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,018
Method: Transit
Radius: 0.83 R⊕
Mass: 0.498 M⊕
Orbit: 1.60588 days
Distance: 64.0065 pc

Planet profile

Orbit and physical properties

Orbital period: 1.60588 days
Semi-major axis: 0.0216 AU
Eccentricity: Not reported by the NASA Exoplanet Archive
Radius: 0.83 Earth radii
Mass: 0.498 Earth masses
Mass provenance: M-R relationship
Density: 4.79 g/cm³
Equilibrium temperature: 789 K
Insolation: 89.1463 Earth flux

Host system

Star and system properties

Host star: K2-257
Stars in system: 1
Known planets in system: 1
Spectral type: Not reported by the NASA Exoplanet Archive
Stellar temperature: 3,725 K
Stellar radius: 0.5 R☉
Stellar mass: 0.52 M☉
Stellar metallicity: -0.03 dex
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 64.0065 parsecs
Right ascension: 12h33m06.79s
Declination: -01d57m11.84s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,018
Publication date: 2018-08
Discovery locale: Space
Facility: K2
Telescope: 0.95 m Kepler Telescope
Instrument: Kepler CCD Array
NASA Exoplanet Archive: Open composite record ↗

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