Key parameters at a glance

A radius of 4.45 Earth radii
A mass of 18.10 Earth masses
Surface gravity around 0.91 g
An orbital period of 16.081 days
Semi-major axis 0.1185 AU
Equilibrium temperature 614 K (341 °C)
Distance from Earth 1,012.07 light-years
Earth Similarity Index 0.323
Travel time at Voyager 1 speed 17,847,771 years

Kepler-636 b Planet Profile

Physical Specs

Radius

4.45 R⊕

Radius (Jupiter)

0.397 R♃

Mass

18.10 M⊕

Mass (Jupiter)

0.057 M♃

Density

1.13 g/cm³

Surface Gravity

0.91 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.323

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

#466of 574

top 81.0%

This planet

4.45R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 69830 d 4.45 R⊕ 61 Vir c 4.46 R⊕ Kepler-33 f 4.46 R⊕

Metric	Earth	Kepler-636 b	Jupiter
Radius (R⊕)	1.00	4.45	11.21
Mass (M⊕)	1.00	18.10	317.83
Density (g/cm³)	5.51	1.13	1.33
Surface Gravity (g)	1.00	0.91	2.53
Insolation (S⊕)	1.00	67.51	0.037

Star Catalogue Identifiers

TIC

TIC 138297607

System

Kepler-636

Percentile among Neptune-like cohort

Radius 4.450 R⊕ · percentile 19 / cohort 574

Mass 18.100 M⊕ · percentile 22 / cohort 574

Orbital period 16.08 d · percentile 47 / cohort 524

Distance 310.30 pc · percentile 48 / cohort 572

ESI 0.323 · percentile 56 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

16.081 days

Semi-major axis

0.1185 AU

Eccentricity

0.000

Inclination

89.93 °

Year Length

A year here lasts approximately 16.08 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1185 AU.

Transit Fingerprint

Depth

0.320 %

Duration

2.871 h

Impact parameter b

0.045

Rp / R★

0.050721

Transit midpoint (BJD)

2,455,015.7600

Photometric dip

Transit produces a flux drop of 3,197 ppm lasting ≈ 2.87 h.

Extended Orbital Architecture

Planet / star radius ratio

0.050721

Semi-major axis / stellar radius

44.928

Impact parameter (b)

0.045

Transit mid-time (BJD)

2,455,015.7600

Angular separation (arcsec)

0.38200

Eq. Temperature

614K

(341 °C)

Insolation (S⊕)

67.51

Earth = 1.00

Earth Similarity (ESI)

0.323

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-636

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,203 K — cooler than the Sun (5,778 K)

Estimated Age

5.01 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.800 R☉

Stellar Mass

0.850 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

6.614 g/cm³

Metallicity ratio

[Fe/H]

Distance

310.30 parsec

Light-years 1,012.07 ly

V-band magnitude

13.91 mag

Voyager-speed travel 17,847,771 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Total Proper Motion

27.005 mas/yr

PM Right Ascension

9.27 mas/yr

PM Declination

-25.36 mas/yr

Galactic Cartesian (pc)

x = 0.302 · y = -0.691 · z = 0.657

Equatorial (J2000)

RA 293.59206° · Dec 41.09509°

Galactic ℓ, b

74.166° · 10.068°

Ecliptic λ, β

309.018° · 61.377°

HTM-20 index

1887519369