Key parameters at a glance

A radius of 2.11 Earth radii
A mass of 5.10 Earth masses
Surface gravity around 1.15 g
An orbital period of 8.512 days
Semi-major axis 0.0800 AU
Equilibrium temperature 839 K (566 °C)
Distance from Earth 1,102.08 light-years
Earth Similarity Index 0.321
Travel time at Voyager 1 speed 19,435,257 years

Kepler-518 b Planet Profile

Physical Specs

Radius

2.11 R⊕

Radius (Jupiter)

0.188 R♃

Mass

5.10 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.98 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.321

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

#1806of 1978

top 91.3%

This planet

2.11R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

61 Vir b 2.11 R⊕ TOI-1238 c 2.11 R⊕ Kepler-1484 b 2.11 R⊕

Metric	Earth	Kepler-518 b	Jupiter
Radius (R⊕)	1.00	2.11	11.21
Mass (M⊕)	1.00	5.10	317.83
Density (g/cm³)	5.51	2.98	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	133.32	0.037

Star Catalogue Identifiers

TIC

TIC 121112251

Gaia DR2

Gaia DR2 2100906140725803392

Gaia DR3

Gaia DR3 2100906140725803392

System

Kepler-518

Percentile among Sub-Neptune cohort

Radius 2.110 R⊕ · percentile 8 / cohort 1978

Mass 5.100 M⊕ · percentile 9 / cohort 1978

Orbital period 8.51 d · percentile 28 / cohort 1946

Distance 337.90 pc · percentile 38 / cohort 1975

ESI 0.321 · percentile 33 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.512 days

Semi-major axis

0.0800 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 8.51 Earth days (2.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0800 AU.

Transit Fingerprint

Depth

0.057 %

Duration

2.192 h

Impact parameter b

0.852

Rp / R★

0.022001

Transit midpoint (BJD)

2,455,007.9098

Photometric dip

Transit produces a flux drop of 574 ppm lasting ≈ 2.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022001

Semi-major axis / stellar radius

30.413

Impact parameter (b)

0.852

Transit mid-time (BJD)

2,455,007.9098

Angular separation (arcsec)

0.23700

Eq. Temperature

839K

(566 °C)

Insolation (S⊕)

133.32

Earth = 1.00

Earth Similarity (ESI)

0.321

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-518

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,842 K — hotter than the Sun (5,778 K)

Estimated Age

1.35 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.880 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

-0.23

Extended Stellar Properties

Surface gravity (log g)

4.530 dex

Stellar density

1.210 g/cm³

Systemic radial velocity

27.71 km/s

Metallicity ratio

[Fe/H]

Distance

337.90 parsec

Light-years 1,102.08 ly

V-band magnitude

12.57 mag

Voyager-speed travel 19,435,257 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.931 mas

Total Proper Motion

21.979 mas/yr

PM Right Ascension

4.42 mas/yr

PM Declination

-21.53 mas/yr

Galactic Cartesian (pc)

x = 0.221 · y = -0.717 · z = 0.661

Equatorial (J2000)

RA 287.09002° · Dec 41.37376°

Galactic ℓ, b

72.276° · 14.603°

Ecliptic λ, β

299.160° · 63.093°

HTM-20 index

-1146878129