L 98-59 d
Planet· orbits L 98-59
L 98-59 d - a transiting planet (~1.6 Earth masses, ~1.6 Earth radii) on a 7.5-day orbit, less dense than its siblings - likely volatile-rich. Its transit gives a measured size and density; never imaged.
Open in 3D viewSee L 98-59 d in the live, interactive 3D map
Key facts
Mass
9.79 × 10²⁴ kg
1.64 M⊕
Radius
10,366 km
1.63× wider than Earth
Surface gravity
6.08 m/s²
62% of Earth's gravity
Year
7.45 Earth days
Distance from L 98-59
7,390,135 km
Science
Physical
- Mass
- 9.79 × 10²⁴ kg · 1.64 M⊕
- Radius
- 10,366 km · 1.63× wider than Earth
- Density
- 2,099 kg/m³ · 2.1× water
- Computed from mass and radius
- Surface gravity
- 6.08 m/s² · 62% of Earth's gravity
- Computed from mass and radius
- Escape velocity
- 11.2 km/s
- Computed from mass and radius
Orbital
- Semi-major axis
- 7,390,135 km
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Eccentricity
- 0.006
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Orbital period
- 7.5 days
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Perihelion
- 7,345,794 km
- Computed from the orbital elements
- Aphelion
- 7,434,476 km
- Computed from the orbital elements
- Mean orbital velocity
- 72.1 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A planet of ~1.6 Earth masses and ~1.6 Earth radii — its measured density is lower than its rocky siblings', pointing to a volatile-rich make-up. 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
- 5 S⊕ · 5× the sunlight Earth receives
- Computed from L 98-59's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 416 K (143 °C)
- Computed model value for its 7.5-day orbit — not a directly measured temperature.
Discovery & history
- Method
- Transit detection
- 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').
The outermost of the three transiting planets found by TESS in 2019, weighed by ESPRESSO.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.