HD 219134 c
Planet· orbits HD 219134
HD 219134 c - a second transiting rocky super-Earth (~4.4 Earth masses, ~1.5 Earth radii) on a 6.8-day orbit. Its transit gives a measured size and a real, rocky density. Its surface has never been seen.
Open in 3D viewSee HD 219134 c in the live, interactive 3D map
Key facts
Mass
2.60 × 10²⁵ kg
4.36 M⊕
Radius
9,627 km
1.51× wider than Earth
Surface gravity
18.8 m/s²
1.91× Earth's gravity
Year
6.77 Earth days
Distance from HD 219134
9,768,741 km
Science
Physical
- Mass
- 2.60 × 10²⁵ kg · 4.36 M⊕
- Radius
- 9,627 km · 1.51× wider than Earth
- Density
- 6,968 kg/m³ · 7× water
- Computed from mass and radius
- Surface gravity
- 18.8 m/s² · 1.91× Earth's gravity
- Computed from mass and radius
- Escape velocity
- 19 km/s · 1.7× Earth's escape velocity
- Computed from mass and radius
Orbital
- Semi-major axis
- 9,768,741 km
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Eccentricity
- 0.062
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Orbital period
- 6.8 days
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Perihelion
- 9,163,079 km
- Computed from the orbital elements
- Aphelion
- 10,374,403 km
- Computed from the orbital elements
- Mean orbital velocity
- 105 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A rocky super-Earth of ~4.4 Earth masses and ~1.5 Earth radii — its transit and measured mass give a real, rocky density. Its surface has never been seen.
- 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.
Radiation & temperature
- Insolation
- 62.1 S⊕ · 62.1× the sunlight Earth receives
- Computed from HD 219134's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 782 K (509 °C)
- Computed model value for its 6.8-day orbit — not a directly measured temperature.
Discovery & history
- Method
- Transit detection
- Name
- Designated 'c' 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 with planet b in 2015 and later shown to transit as well - a second measured rocky world in this nearby system.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.