Key parameters at a glance

A radius of 2.60 Earth radii
A mass of 7.27 Earth masses
Surface gravity around 1.08 g
An orbital period of 3.596 days
Semi-major axis 0.0449 AU
Equilibrium temperature 1,296 K (1023 °C)
Distance from Earth 3,985.50 light-years
Earth Similarity Index 0.185
Travel time at Voyager 1 speed 70,284,216 years

Kepler-618 b Planet Profile

Physical Specs

Radius

2.60 R⊕

Radius (Jupiter)

0.232 R♃

Mass

7.27 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.27 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.185

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

#1017of 1978

top 51.4%

This planet

2.60R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-155 c 2.60 R⊕ Kepler-84 e 2.60 R⊕ Kepler-115 c 2.60 R⊕

Metric	Earth	Kepler-618 b	Jupiter
Radius (R⊕)	1.00	2.60	11.21
Mass (M⊕)	1.00	7.27	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	677.57	0.037

Star Catalogue Identifiers

TIC

TIC 405719849

Gaia DR2

Gaia DR2 2131136491375075328

Gaia DR3

Gaia DR3 2131136491375075328

System

Kepler-618

Percentile among Sub-Neptune cohort

Radius 2.600 R⊕ · percentile 48 / cohort 1978

Mass 7.270 M⊕ · percentile 44 / cohort 1978

Orbital period 3.60 d · percentile 7 / cohort 1946

Distance 1,221.96 pc · percentile 87 / cohort 1975

ESI 0.185 · percentile 5 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.596 days

Semi-major axis

0.0449 AU

Eccentricity

0.000

Inclination

86.34 °

Year Length

A year here lasts approximately 3.60 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0449 AU.

Transit Fingerprint

Depth

0.038 %

Duration

3.325 h

Impact parameter b

0.911

Rp / R★

0.021619

Transit midpoint (BJD)

2,455,003.3696

Photometric dip

Transit produces a flux drop of 384 ppm lasting ≈ 3.32 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021619

Semi-major axis / stellar radius

3.710

Impact parameter (b)

0.911

Transit mid-time (BJD)

2,455,003.3696

Angular separation (arcsec)

0.03670

Eq. Temperature

1,296K

(1023 °C)

Insolation (S⊕)

677.57

Earth = 1.00

Earth Similarity (ESI)

0.185

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-618

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,860 K — hotter than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.080 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

0.580 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,221.96 parsec

Light-years 3,985.50 ly

V-band magnitude

15.09 mag

Voyager-speed travel 70,284,216 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.790 mas

Total Proper Motion

3.743 mas/yr

PM Right Ascension

3.12 mas/yr

PM Declination

-2.07 mas/yr

Galactic Cartesian (pc)

x = 0.187 · y = -0.642 · z = 0.744

Equatorial (J2000)

RA 286.24985° · Dec 48.06093°

Galactic ℓ, b

78.479° · 17.699°

Ecliptic λ, β

302.563° · 69.670°

HTM-20 index

-635735990