Key parameters at a glance

A radius of 5.11 Earth radii
A mass of 22.90 Earth masses
Surface gravity around 0.88 g
An orbital period of 10.035 days
Semi-major axis 0.0886 AU
Equilibrium temperature 786 K (513 °C)
Distance from Earth 3,017.06 light-years
Earth Similarity Index 0.238
Travel time at Voyager 1 speed 53,205,915 years

Kepler-818 b Planet Profile

Physical Specs

Radius

5.11 R⊕

Radius (Jupiter)

0.456 R♃

Mass

22.90 M⊕

Mass (Jupiter)

0.072 M♃

Density

0.94 g/cm³

Surface Gravity

0.88 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.238

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

#366of 574

top 63.6%

This planet

5.11R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HIP 48714 b 5.11 R⊕ 61 Vir d 5.11 R⊕ Kepler-1314 b 5.11 R⊕

Metric	Earth	Kepler-818 b	Jupiter
Radius (R⊕)	1.00	5.11	11.21
Mass (M⊕)	1.00	22.90	317.83
Density (g/cm³)	5.51	0.94	1.33
Surface Gravity (g)	1.00	0.88	2.53
Insolation (S⊕)	1.00	100.78	0.037

Star Catalogue Identifiers

TIC

TIC 184417625

Gaia DR2

Gaia DR2 2073292868278609664

Gaia DR3

Gaia DR3 2073292868280455936

System

Kepler-818

Percentile among Neptune-like cohort

Radius 5.110 R⊕ · percentile 36 / cohort 574

Mass 22.900 M⊕ · percentile 37 / cohort 574

Orbital period 10.04 d · percentile 37 / cohort 524

Distance 925.04 pc · percentile 72 / cohort 572

ESI 0.238 · percentile 38 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

10.035 days

Semi-major axis

0.0886 AU

Eccentricity

0.000

Inclination

89.81 °

Year Length

A year here lasts approximately 10.04 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0886 AU.

Transit Fingerprint

Depth

0.283 %

Duration

3.419 h

Impact parameter b

0.028

Rp / R★

0.050751

Transit midpoint (BJD)

2,454,970.4713

Photometric dip

Transit produces a flux drop of 2,830 ppm lasting ≈ 3.42 h.

Extended Orbital Architecture

Planet / star radius ratio

0.050751

Semi-major axis / stellar radius

23.567

Impact parameter (b)

0.028

Transit mid-time (BJD)

2,454,970.4713

Angular separation (arcsec)

0.09580

Eq. Temperature

786K

(513 °C)

Insolation (S⊕)

100.78

Earth = 1.00

Earth Similarity (ESI)

0.238

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-818

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,638 K — cooler than the Sun (5,778 K)

Estimated Age

3.98 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.920 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

2.459 g/cm³

Metallicity ratio

[Fe/H]

Distance

925.04 parsec

Light-years 3,017.06 ly

V-band magnitude

15.37 mag

Voyager-speed travel 53,205,915 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.054 mas

Total Proper Motion

10.541 mas/yr

PM Right Ascension

-3.95 mas/yr

PM Declination

-9.77 mas/yr

Galactic Cartesian (pc)

x = 0.342 · y = -0.693 · z = 0.634

Equatorial (J2000)

RA 296.23511° · Dec 39.37029°

Galactic ℓ, b

73.596° · 7.474°

Ecliptic λ, β

311.672° · 59.072°

HTM-20 index

-1081953362