55 Cancri f
Planet· orbits 55 Cancri
55 Cancri f - a Saturn-mass planet (~45 Earth masses) orbiting near the warm inner edge of the star's temperate zone every 260 days. Found by radial velocity; never transited, so its size is model-based. Never imaged.
Open in 3D viewSee 55 Cancri f in the live, interactive 3D map
Key facts
Mass
2.68 × 10²⁶ kg
44.8 M⊕
Year
261 Earth days
Distance from 55 Cancri
0.802 AU
Science
Physical
- Mass
- 2.68 × 10²⁶ kg · 44.8 M⊕
- Radius
- Not measured
- No transit — radius is a model estimate; no density is quoted.
Orbital
- Semi-major axis
- 0.802 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.063
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 260.6 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.751 AU
- Computed from the orbital elements
- Aphelion
- 0.853 AU
- Computed from the orbital elements
- Mean orbital velocity
- 33.5 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A Saturn-class planet of true mass ~45 Earth on a temperate-zone orbit — a gas/ice giant; never imaged.
- Cloud appearance
- Appearance based on ESO/M. Kornmesser's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The banded clouds shown are a representation of its class, shown only in Visual mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.987 S⊕ · ≈ the sunlight Earth receives
- Computed from 55 Cancri's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 277 K (4 °C)
- Computed model value for its 260-day orbit, near the temperate zone — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'f' under the IAU convention that letters a star's planets 'b', 'c', 'd'... in the order they are discovered (the star itself is the unwritten 'a').
Announced in 2007 as the fifth planet of 55 Cancri, notable for lying close to the star's habitable zone.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.