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55 Cnc B c | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/55 Cnc B c

Confirmed exoplanet · Super Earth

55 Cnc B c

Orbiting 55 Cnc B

Discovered in 2025 using Radial Velocity. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic super earth catalog artwork; not a direct image of 55 Cnc B c — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,025
Method: Radial Velocity
Radius: 2.16 R⊕
Mass: 5.3 M⊕
Orbit: 33.747 days
Distance: 12.4773 pc

Planet profile

Orbit and physical properties

Orbital period: 33.747 days
Semi-major axis: 0.13 AU
Eccentricity: 0
Radius: 2.16 Earth radii
Mass: 5.3 Earth masses
Mass provenance: Msini
Density: 2.89 g/cm³
Equilibrium temperature: 230.04 K
Insolation: 0.4613 Earth flux

Host system

Star and system properties

Host star: 55 Cnc B
Stars in system: 2
Known planets in system: 7
Spectral type: M4.5 V
Stellar temperature: 3,286 K
Stellar radius: 0.274 R☉
Stellar mass: 0.26 M☉
Stellar metallicity: 0.16 dex
Stellar age: 10 Gyr
Distance: 12.4773 parsecs
Right ascension: 08h52m40.30s
Declination: +28d18m55.03s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,025
Publication date: 2026-01
Discovery locale: Ground
Facility: Mauna Kea Observatory
Telescope: 3.58 m Canada-France-Hawaii Telescope (CFHT)
Instrument: SPIRou
NASA Exoplanet Archive: Open composite record ↗

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