YZ Ceti c

Planet· orbits YZ Ceti

YZ Ceti c - the middle planet of YZ Ceti (minimum mass ~1.1 Earth), on a 3-day orbit. Never imaged.

Open in 3D viewSee YZ Ceti c in the live, interactive 3D map

Key facts

Minimum mass

6.81 × 10²⁴ kg

1.14 M⊕

Year

3.06 Earth days

Distance from YZ Ceti

3,231,314 km

Minimum mass (m·sin i): 6.81 × 10²⁴ kg · 1.14 M⊕; Radial-velocity detection measures m·sin i; the true mass depends on the unknown orbital inclination.
Radius: Not measured; No transit — radius is a model estimate; true size unknown.

Semi-major axis: 3,231,314 km; From the NASA Exoplanet Archive (radial-velocity orbit)
Eccentricity: 0; From the NASA Exoplanet Archive (radial-velocity orbit)
Inclination: 0.00 °; From the NASA Exoplanet Archive (radial-velocity orbit)
Orbital period: 3.1 days; From the NASA Exoplanet Archive (radial-velocity orbit)
Perihelion: 3,231,314 km; Computed from the orbital elements
Aphelion: 3,231,314 km; Computed from the orbital elements
Mean orbital velocity: 76.8 km/s; Computed from the orbital elements

Bulk composition: Presumed rocky (minimum mass ~1.1 Earth); never imaged.
Surface appearance: Appearance based on ESO/M. Kornmesser's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The surface shown is an artistic representation, shown only in Visual mode; Realism shows a plain spectral colour.

Insolation: 4.72 S⊕ · 4.72× the sunlight Earth receives; Computed from YZ Ceti's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
Equilibrium temperature: 410 K (137 °C); Computed model value — not measured.

Method: Radial-velocity detection (stellar wobble)
Name: Designated 'c' as the second planet found around its star, following the IAU convention of lettering planets in discovery order from 'b'.

The second of three planets found by HARPS in 2017.

No official imagery available — this object has never been visited and no officially-licensed depiction exists.