Key parameters at a glance

A radius of 12.15 Earth radii
An orbital period of 1.595 days
Semi-major axis 0.0258 AU
Equilibrium temperature 1,539 K (1266 °C)
Distance from Earth 4,862.79 light-years
Earth Similarity Index 0.023
Travel time at Voyager 1 speed 85,755,302 years

Kepler-686 b Planet Profile

Physical Specs

Radius

12.15 R⊕

Radius (Jupiter)

1.084 R♃

Mass

— M⊕

Mass (Jupiter)

— M♃

Density

— g/cm³

Surface Gravity

— g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.023

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1444of 1771

top 81.5%

This planet

12.15R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

K2-113 b 12.14 R⊕ TOI-2485 b 12.14 R⊕ TOI-4515 b 12.17 R⊕

Metric	Earth	Kepler-686 b	Jupiter
Radius (R⊕)	1.00	12.15	11.21
Mass (M⊕)	1.00	—	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	—	2.53
Insolation (S⊕)	1.00	2,132.90	0.037

Star Catalogue Identifiers

TIC

TIC 399794420

Gaia DR2

Gaia DR2 2100247945575646336

Gaia DR3

Gaia DR3 2100247945575646336

System

Kepler-686

Percentile among Gas Giant cohort

Radius 12.150 R⊕ · percentile 18 / cohort 1771

Orbital period 1.59 d · percentile 4 / cohort 1533

Distance 1,490.94 pc · percentile 89 / cohort 1759

ESI 0.023 · percentile 0 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1.595 days

Semi-major axis

0.0258 AU

Eccentricity

0.000

Inclination

85.25 °

Year Length

A year here lasts approximately 1.59 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0258 AU.

Transit Fingerprint

Depth

1.504 %

Duration

1.956 h

Impact parameter b

0.514

Rp / R★

0.120687

Transit midpoint (BJD)

2,455,003.6483

Photometric dip

Transit produces a flux drop of 15,045 ppm lasting ≈ 1.96 h.

Extended Orbital Architecture

Planet / star radius ratio

0.120687

Semi-major axis / stellar radius

6.203

Impact parameter (b)

0.514

Transit mid-time (BJD)

2,455,003.6483

Angular separation (arcsec)

0.01730

Eq. Temperature

1,539K

(1266 °C)

Insolation (S⊕)

2,132.90

Earth = 1.00

Earth Similarity (ESI)

0.023

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-686

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,649 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.920 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.775 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,490.94 parsec

Light-years 4,862.79 ly

V-band magnitude

16.02 mag

Voyager-speed travel 85,755,302 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.642 mas

Total Proper Motion

4.233 mas/yr

PM Right Ascension

0.10 mas/yr

PM Declination

4.23 mas/yr

Galactic Cartesian (pc)

x = 0.204 · y = -0.750 · z = 0.630

Equatorial (J2000)

RA 285.21382° · Dec 39.02747°

Galactic ℓ, b

69.462° · 14.995°

Ecliptic λ, β

294.991° · 61.153°

HTM-20 index

301007890