HD 219134 d
Planet· orbits HD 219134
HD 219134 d - a warm, more massive planet (~16 Earth masses) on a 47-day orbit. It does not transit, so its radius is a model estimate and no density is quoted; never imaged.
Open in 3D viewSee HD 219134 d in the live, interactive 3D map
Key facts
Mass
9.66 × 10²⁵ kg
16.2 M⊕
Year
46.74 Earth days
Distance from HD 219134
0.237 AU
Science
Physical
- Mass
- 9.66 × 10²⁵ kg · 16.2 M⊕
- Radius
- Not measured
- Does not transit — radius is a model estimate for a ~16-Earth-mass world, so no density is quoted.
Orbital
- Semi-major axis
- 0.237 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.138
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 46.7 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.204 AU
- Computed from the orbital elements
- Aphelion
- 0.27 AU
- Computed from the orbital elements
- Mean orbital velocity
- 55.2 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A warm planet of ~16 Earth masses (a dynamical mass, shown plainly); it does not transit, so its size is a model estimate and it has never been 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
- 4.71 S⊕ · 4.71× the sunlight Earth receives
- Computed from HD 219134's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 410 K (137 °C)
- Computed model value for its 47-day orbit — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'd' 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').
Part of the planet family announced in 2015 from radial-velocity data.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.