Teegarden's Star d
Planet· orbits Teegarden's Star
Teegarden's Star d - the outermost known planet (minimum mass ~0.8 Earth), on a 26-day orbit beyond the temperate zone. Never imaged.
Open in 3D viewSee Teegarden's Star d in the live, interactive 3D map
Key facts
Minimum mass
4.90 × 10²⁴ kg
0.82 M⊕
Year
26.13 Earth days
Distance from Teegarden's Star
11,833,192 km
Science
Physical
- Minimum mass (m·sin i)
- 4.90 × 10²⁴ kg · 0.82 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.
Orbital
- Semi-major axis
- 11,833,192 km
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.07
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 26.1 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 11,004,868 km
- Computed from the orbital elements
- Aphelion
- 12,661,515 km
- Computed from the orbital elements
- Mean orbital velocity
- 32.9 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- Presumed rocky (minimum mass ~0.8 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.
Radiation & temperature
- Insolation
- 0.117 S⊕ · 12% of the sunlight Earth receives
- Computed from Teegarden's Star's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 159 K (-114 °C)
- Computed model value — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'd' as the third planet found around its star, following the IAU convention of lettering planets in discovery order from 'b'.
A third planet added in 2024 from extended radial-velocity monitoring.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.