Star system, 580 light-years
Kepler-186 and its five planets
Kepler-186 f is an exoplanet 1.17 times Earth's width, 580 light-years away, orbiting in its star's computed habitable zone.
Kepler-186 is a star of spectral type M1, 580 light-years from us, with five known planets. This page takes them one at a time.
Drawn at the system's own scale, every orbit from the Archive's numbers.
What is measured, what is computed, what is imagined.
measured The period, and where the table says so the width and the mass, by the method named in each section.
computed Anything marked computed: the size of an orbit where Kepler's third law corrects the table, the temperature of a bare ball at that distance, the starlight received, and the habitable zone.
imagined The picture is an artist's impression. Nobody has seen the surface of a planet of another star: its colour, clouds and land are not known, and the share picture says so in its corner.
The planets
Kepler-186 b
Kepler-186 b is an exoplanet 1.07 times Earth's width, 580 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 1.07 × Earth's measured
- Mass
- about 1.24 times Earth's estimated by the Archive from the planet's size, not measured
- One year
- 3.88679 days measured
- Distance from its star
- 0.03783 au computed from the period and the star's mass
- Temperature of a bare ball there
- 590 K computed, not measured
- Starlight, against Earth's
- 28.8 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2014. Its orbit is closer to its star than the habitable zone computed for it. The Archive's own distance for it is 0.0343 au; the three papers behind its period, its star's mass and that distance do not agree with Kepler's third law, so the page uses the one the period and the star's mass give.
See Kepler-186 b in 3D · The picture is an artist's impression.
Kepler-186 c
Kepler-186 c is an exoplanet 1.25 times Earth's width, 580 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 1.25 × Earth's measured
- Mass
- about 2.1 times Earth's estimated by the Archive from the planet's size, not measured
- One year
- 7.2673 days measured
- Distance from its star
- 0.05741 au computed from the period and the star's mass
- Temperature of a bare ball there
- 479 K computed, not measured
- Starlight, against Earth's
- 12.5 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2014. Its orbit is closer to its star than the habitable zone computed for it. The Archive's own distance for it is 0.0451 au; the three papers behind its period, its star's mass and that distance do not agree with Kepler's third law, so the page uses the one the period and the star's mass give.
See Kepler-186 c in 3D · The picture is an artist's impression.
Kepler-186 d
Kepler-186 d is an exoplanet 1.4 times Earth's width, 580 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 1.4 × Earth's measured
- Mass
- about 2.54 times Earth's estimated by the Archive from the planet's size, not measured
- One year
- 13.343 days measured
- Distance from its star
- 0.08608 au computed from the period and the star's mass
- Temperature of a bare ball there
- 391 K computed, not measured
- Starlight, against Earth's
- 5.56 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2014. Its orbit is closer to its star than the habitable zone computed for it. The Archive's own distance for it is 0.0781 au; the three papers behind its period, its star's mass and that distance do not agree with Kepler's third law, so the page uses the one the period and the star's mass give.
See Kepler-186 d in 3D · The picture is an artist's impression.
Kepler-186 e
Kepler-186 e is an exoplanet 1.27 times Earth's width, 580 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 1.27 × Earth's measured
- Mass
- about 2.15 times Earth's estimated by the Archive from the planet's size, not measured
- One year
- 22.4077 days measured
- Distance from its star
- 0.1216 au computed from the period and the star's mass
- Temperature of a bare ball there
- 329 K computed, not measured
- Starlight, against Earth's
- 2.79 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2014. Its orbit is closer to its star than the habitable zone computed for it. The Archive's own distance for it is 0.11 au; the three papers behind its period, its star's mass and that distance do not agree with Kepler's third law, so the page uses the one the period and the star's mass give.
See Kepler-186 e in 3D · The picture is an artist's impression.
Kepler-186 f
Kepler-186 f is an exoplanet 1.17 times Earth's width, 580 light-years away, orbiting in its star's computed habitable zone.
- Width
- 1.17 × Earth's measured
- Mass
- about 1.71 times Earth's estimated by the Archive from the planet's size, not measured
- One year
- 129.944 days measured
- Distance from its star
- 0.3926 au computed from the period and the star's mass
- Temperature of a bare ball there
- 183 K computed, not measured
- Starlight, against Earth's
- 0.267 × computed
It was found as a small, regular dip in its star's light each time it crosses in front of it in 2014. Its orbit lies inside the conservative habitable zone computed for its star (liquid water on a rocky world's surface would be possible there, which says nothing about whether any is). The Archive's own distance for it is 0.432 au; the three papers behind its period, its star's mass and that distance do not agree with Kepler's third law, so the page uses the one the period and the star's mass give.
See Kepler-186 f in 3D · The picture is an artist's impression.
The star
- Surface temperature
- 3,788 K
- Width
- 0.472 × the Sun's
- Mass
- 0.478 × the Sun's
- Spectral type
- M1
- Distance
- 580 light-years
- Habitable zone, computed
- 0.2094 to 0.401 au from the star