Kepler-186 b
Planet· orbits Kepler-186
Kepler-186 b — the innermost planet, an Earth-size world (1.07 Earth radii) on a hot 3.9-day orbit. Its size is measured; its mass is only size-estimated, so no density is quoted. Likely rocky and far too hot for liquid water. Never imaged.
Open in 3D viewSee Kepler-186 b in the live, interactive 3D map
Key facts
Radius
6,817 km
1.07× wider than Earth
Year
3.89 Earth days
Distance from Kepler-186
5,131,207 km
Science
Physical
- Radius
- 6,817 km · 1.07× wider than Earth
Orbital
- Semi-major axis
- 5,131,207 km
- From the NASA Exoplanet Archive (transit + orbit fit)
- Eccentricity
- 0
- From the NASA Exoplanet Archive (transit + orbit fit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (transit + orbit fit)
- Orbital period
- 3.9 days
- From the NASA Exoplanet Archive (transit + orbit fit)
- Perihelion
- 5,131,207 km
- Computed from the orbital elements
- Aphelion
- 5,131,207 km
- Computed from the orbital elements
- Mean orbital velocity
- 96 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- An Earth-size world (1.07 Earth radii); its size is measured, its mass only size-estimated, so no density is quoted. Likely rocky and far too hot for liquid water. Never imaged.
- Surface appearance
- Appearance based on NASA/JPL-Caltech'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
- 35.1 S⊕ · 35.1× the sunlight Earth receives
- Computed from Kepler-186's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 571 K (298 °C)
- Computed model value for its hot 3.9-day orbit — not measured.
Discovery & history
- Method
- Transit detection
- Name
- Designated 'b' under the IAU convention that letters a star's planets 'b', 'c', 'd'... in the order they are found (the star is the unwritten 'a'); no IAU proper name has been assigned.
One of four small transiting planets confirmed around Kepler-186 in 2014.
Images
No telescope has imaged this world — it is known only from the tiny dip it makes crossing its star. Only its host system has been pictured (see the system view); its true surface appearance is unknown.