L 98-59 c
Planet· orbits L 98-59
L 98-59 c - a transiting rocky super-Earth (~2 Earth masses, ~1.3 Earth radii) on a 3.7-day orbit. Its transit gives a measured size and density. Its surface has never been seen.
Open in 3D viewSee L 98-59 c in the live, interactive 3D map
Key facts
Mass
1.19 × 10²⁵ kg
2 M⊕
Radius
8,467 km
1.33× wider than Earth
Surface gravity
11.1 m/s²
1.13× Earth's gravity
Year
3.69 Earth days
Distance from L 98-59
4,622,574 km
Science
Physical
- Mass
- 1.19 × 10²⁵ kg · 2 M⊕
- Radius
- 8,467 km · 1.33× wider than Earth
- Density
- 4,698 kg/m³ · 4.7× water
- Computed from mass and radius
- Surface gravity
- 11.1 m/s² · 1.13× Earth's gravity
- Computed from mass and radius
- Escape velocity
- 13.7 km/s · 1.23× Earth's escape velocity
- Computed from mass and radius
Orbital
- Semi-major axis
- 4,622,574 km
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Eccentricity
- 0.002
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Orbital period
- 3.7 days
- From the NASA Exoplanet Archive (transit + radial-velocity orbit)
- Perihelion
- 4,613,329 km
- Computed from the orbital elements
- Aphelion
- 4,631,819 km
- Computed from the orbital elements
- Mean orbital velocity
- 91.1 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A rocky super-Earth of ~2 Earth masses and ~1.3 Earth radii — its transit and measured mass give a real density. 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
- 12.8 S⊕ · 12.8× the sunlight Earth receives
- Computed from L 98-59's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 526 K (253 °C)
- Computed model value for its 3.7-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').
One of the three transiting planets TESS found in 2019, its mass measured by ESPRESSO.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.