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Exoplanet system · evidence and sources

Kepler-186

Red dwarf hosting Kepler-186f, the first Earth-size planet found in the habitable zone of another star.

Exoplanet Archive · 18 d Position basis, the same label the app shows on the selection card.

Open in Space Time

Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented
Position Catalog

Host star position and distance (archive)

Kepler-186 at RA 19.9 h, Dec 44°, 579.2 light-years, spectral type M1. Gaia DR3 2079000330051813504.

SourceNASA Exoplanet Archive, Planetary Systems Composite Parameters · record Kepler-186
Retrieved
MethodTAP query: select hostname,pl_name,hd_name,hip_name,tic_id,gaia_dr2_id,gaia_dr3_id,ra,dec,sy_dist,st_teff,st_rad,st_mass,st_lum,st_spectype,pl_orbsmax,pl_orbper,pl_rade,pl…
Position Catalog

Kepler-186 distance

Distance: 579.23 ly.

SourceTICv8 · record Kepler-186
Retrieved
Uncertainty+2.5244 / −2.5244 ly
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Planet orbits (5 confirmed)

Kepler-186 b, Kepler-186 c, Kepler-186 d, Kepler-186 e, Kepler-186 f: semi-major axes and periods come from the archive's composite parameters. Missing eccentricities or inclinations are filled with explicit defaults recorded per parameter in the snapshot (parameterOrigins), never guessed silently.

SourceNASA Exoplanet Archive, Planetary Systems Composite Parameters · record Kepler-186
Retrieved
MethodElliptical two-body orbits driven by the simulation clock; orbital phase at J2000 is a presentation choice unless a transit mid-time is published.
LimitOrbits are drawn enlarged in the system view for visibility (the app labels the scale). Composite parameters mix references; the archive lists them per value.
Orbit Catalog

Kepler-186 b year length

Year length: 3.8868 days.

SourceQuintana et al. 2014 · record Kepler-186 b
Retrieved
Uncertainty+0.0000062 / −0.0000063 days
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 b orbit radius

Orbit radius: 0.0343 AU.

SourceQuintana et al. 2014 · record Kepler-186 b
Retrieved
Uncertainty+0.0046 / −0.0046 AU
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 c year length

Year length: 7.2673 days.

SourceQuintana et al. 2014 · record Kepler-186 c
Retrieved
Uncertainty+0.000012 / −0.000011 days
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 c orbit radius

Orbit radius: 0.0451 AU.

SourceQuintana et al. 2014 · record Kepler-186 c
Retrieved
Uncertainty+0.007 / −0.007 AU
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 d year length

Year length: 13.343 days.

SourceQuintana et al. 2014 · record Kepler-186 d
Retrieved
Uncertainty+0.000025 / −0.000024 days
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 d orbit radius

Orbit radius: 0.0781 AU.

SourceQuintana et al. 2014 · record Kepler-186 d
Retrieved
Uncertainty+0.01 / −0.01 AU
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 e year length

Year length: 22.408 days.

SourceQuintana et al. 2014 · record Kepler-186 e
Retrieved
Uncertainty+0.000074 / −0.000072 days
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 e orbit radius

Orbit radius: 0.11 AU.

SourceQuintana et al. 2014 · record Kepler-186 e
Retrieved
Uncertainty+0.015 / −0.015 AU
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 f year length

Year length: 129.94 days.

SourceTorres et al. 2015 · record Kepler-186 f
Retrieved
Uncertainty+0.0013 / −0.0012 days
LimitComposite parameters can use different publications; they need not form one consistent solution.
Orbit Catalog

Kepler-186 f orbit radius

Orbit radius: 0.432 AU.

SourceTorres et al. 2015 · record Kepler-186 f
Retrieved
Uncertainty+0.171 / −0.053 AU
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Planet sizes and masses

Bulk values come from a composite catalog. Read each parameter record below for its source, limits and calculation status; a catalog entry is not necessarily a measurement.

SourceNASA Exoplanet Archive, Planetary Systems Composite Parameters · record Kepler-186
Retrieved
LimitComposite parameters may combine a measured radius with a mass estimated from a mass-radius relation; the archive flags which.
Physical data Catalog

Kepler-186 b radius

Radius: 1.07 R⊕.

SourceQuintana et al. 2014 · record Kepler-186 b
Retrieved
Uncertainty+0.12 / −0.12 R⊕
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Computed

Kepler-186 b mass

Mass: 1.24 M⊕ · archive calculated.

SourceCalculated Value · record Kepler-186 b
Retrieved
MethodCalculated by the NASA Exoplanet Archive; no reported uncertainty.
UncertaintyUnavailable; missing uncertainty is not zero.
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 b equilibrium temperature

Equilibrium temperature: 571 K.

SourceQ1-Q17 DR25 KOI Table · record Kepler-186 b
Retrieved
UncertaintyUnavailable; missing uncertainty is not zero.
LimitEquilibrium temperature is a model estimate, not a measured surface temperature. Composite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 c radius

Radius: 1.25 R⊕.

SourceQuintana et al. 2014 · record Kepler-186 c
Retrieved
Uncertainty+0.14 / −0.14 R⊕
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Computed

Kepler-186 c mass

Mass: 2.1 M⊕ · archive calculated.

SourceCalculated Value · record Kepler-186 c
Retrieved
MethodCalculated by the NASA Exoplanet Archive; no reported uncertainty.
UncertaintyUnavailable; missing uncertainty is not zero.
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 c equilibrium temperature

Equilibrium temperature: 464 K.

SourceQ1-Q17 DR25 KOI Table · record Kepler-186 c
Retrieved
UncertaintyUnavailable; missing uncertainty is not zero.
LimitEquilibrium temperature is a model estimate, not a measured surface temperature. Composite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 d radius

Radius: 1.4 R⊕.

SourceQuintana et al. 2014 · record Kepler-186 d
Retrieved
Uncertainty+0.16 / −0.16 R⊕
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Computed

Kepler-186 d mass

Mass: 2.54 M⊕ · archive calculated.

SourceCalculated Value · record Kepler-186 d
Retrieved
MethodCalculated by the NASA Exoplanet Archive; no reported uncertainty.
UncertaintyUnavailable; missing uncertainty is not zero.
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 d equilibrium temperature

Equilibrium temperature: 379 K.

SourceQ1-Q17 DR25 KOI Table · record Kepler-186 d
Retrieved
UncertaintyUnavailable; missing uncertainty is not zero.
LimitEquilibrium temperature is a model estimate, not a measured surface temperature. Composite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 e radius

Radius: 1.27 R⊕.

SourceQuintana et al. 2014 · record Kepler-186 e
Retrieved
Uncertainty+0.15 / −0.14 R⊕
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Computed

Kepler-186 e mass

Mass: 2.15 M⊕ · archive calculated.

SourceCalculated Value · record Kepler-186 e
Retrieved
MethodCalculated by the NASA Exoplanet Archive; no reported uncertainty.
UncertaintyUnavailable; missing uncertainty is not zero.
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 e equilibrium temperature

Equilibrium temperature: 319 K.

SourceQ1-Q17 DR25 KOI Table · record Kepler-186 e
Retrieved
UncertaintyUnavailable; missing uncertainty is not zero.
LimitEquilibrium temperature is a model estimate, not a measured surface temperature. Composite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 f radius

Radius: 1.17 R⊕.

SourceTorres et al. 2015 · record Kepler-186 f
Retrieved
Uncertainty+0.08 / −0.08 R⊕
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Computed

Kepler-186 f mass

Mass: 1.71 M⊕ · archive calculated.

SourceCalculated Value · record Kepler-186 f
Retrieved
MethodCalculated by the NASA Exoplanet Archive; no reported uncertainty.
UncertaintyUnavailable; missing uncertainty is not zero.
LimitComposite parameters can use different publications; they need not form one consistent solution.
Physical data Catalog

Kepler-186 f equilibrium temperature

Equilibrium temperature: 177 K.

SourceQ1-Q17 DR25 KOI Table · record Kepler-186 f
Retrieved
UncertaintyUnavailable; missing uncertainty is not zero.
LimitEquilibrium temperature is a model estimate, not a measured surface temperature. Composite parameters can use different publications; they need not form one consistent solution.
Appearance Illustrative

Rendered planet appearance

Each planet's colour, banding, clouds and ice are inferred from its bulk density, equilibrium temperature and insolation by an appearance classifier. No exoplanet in this system has a resolved image.

SourceSpace Time rendering contract
LimitIllustrative. The classifier is deterministic and the same numbers always give the same look.
Description Undocumented

Description and facts

The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.

SourceSpace Time editorial text
LimitBackground reading is linked under Further reading; it is not the source of the displayed numbers.

What is not measured

  • Appearance: a picture, not a measurement. Rendered planet appearance. Illustrative. The classifier is deterministic and the same numbers always give the same look.

Not yet documented

  • Description: Background reading is linked under Further reading; it is not the source of the displayed numbers.

Dataset freshness

Snapshots this page depends on, read from the generated manifests at request time.
DatasetBundle updatedHorizonAutomated
Exoplanet systems (pscomppars)
NASA Exoplanet Archive
Source retrieved:
Confirmed planets only; composite parameters as published at the snapshot Yes, weekly (Trigger.dev)
Trigger.dev → private Blob snapshots
Last successful check: 5 October 2026 · success

Sources cited

Further reading

Wikipedia: Kepler-186 (background only; not the source of the displayed numbers)

More

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