Traduit par IA (Opus 5.5) à partir de la fiche anglaise. Les nombres, noms et sources sont inchangés.

Étoile avec 5 planètes connues

55 Cnc

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55 Cnc, une étoile G8 V, possède 5 planètes confirmées.

Mesuré

Distance: environ 41 années-lumière
Type spectral de l'étoile: G8 V
Planètes confirmées: 5

Distance au Soleil

À propos 41 années-lumière. Pour la traverser :

Lumière41 ans
Vitesse de Voyager 1729,000 ans
Roule à 100 km/h442 millions d’années

Voyager 1 à la vitesse à laquelle elle s'est éloignée au cours de l'année jusqu'à 2026-10-25 (JPL Horizons). En voiture : sans arrêt, sans jamais refaire le plein.

Faits

55 Cnc f a une température d'équilibre comprise entre −50 et +50 °C.

Méthode de découverte

Première planète découverte en 1996, par vitesse radiale (NASA Exoplanet Archive).

Ses planètes

55 Cnc b — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 15 days; about 430 °C, hotter than boiling water; found in 1996 by radial velocity.
55 Cnc c — 8.5 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 44 days; about 230 °C, hotter than boiling water; found in 2004 by radial velocity.
55 Cnc d — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 13 Earth years; about −170 °C, below freezing; found in 2002 by radial velocity.
55 Cnc e — 1.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 18 hours; about 1,700 °C, hot enough to melt rock; found in 2004 by radial velocity.
55 Cnc f — 7.6 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 260 days; about 4 °C, between freezing and boiling; found in 2007 by radial velocity.

The NASA Exoplanet Archive's page

Source

NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.

Chaque catalogue utilisé par Ouranos est cité dans la page des crédits.

Distance au Soleil

À propos 41 années-lumière. Pour la traverser :

Lumière41 ans

Vitesse de Voyager 1729,000 ans

Roule à 100 km/h442 millions d’années

Voyager 1 à la vitesse à laquelle elle s'est éloignée au cours de l'année jusqu'à 2026-10-25 (JPL Horizons). En voiture : sans arrêt, sans jamais refaire le plein.

Ses planètes

55 Cnc b — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 15 days; about 430 °C, hotter than boiling water; found in 1996 by radial velocity.

55 Cnc c — 8.5 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 44 days; about 230 °C, hotter than boiling water; found in 2004 by radial velocity.

55 Cnc d — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 13 Earth years; about −170 °C, below freezing; found in 2002 by radial velocity.

55 Cnc e — 1.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 18 hours; about 1,700 °C, hot enough to melt rock; found in 2004 by radial velocity.

55 Cnc f — 7.6 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 260 days; about 4 °C, between freezing and boiling; found in 2007 by radial velocity.

Source

NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.

This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.