Key parameters at a glance

A radius of 2.74 Earth radii
A mass of 7.95 Earth masses
Surface gravity around 1.06 g
An orbital period of 38.672 days
Semi-major axis 0.2079 AU
Equilibrium temperature 502 K (229 °C)
Distance from Earth 2,897.33 light-years
Earth Similarity Index 0.477
Travel time at Voyager 1 speed 51,094,329 years

Kepler-1118 b Planet Profile

Physical Specs

Radius

2.74 R⊕

Radius (Jupiter)

0.244 R♃

Mass

7.95 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.12 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.477

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

#815of 1978

top 41.2%

This planet

2.74R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-212 c 2.74 R⊕ Kepler-192 b 2.74 R⊕ TOI-251 b 2.74 R⊕

Metric	Earth	Kepler-1118 b	Jupiter
Radius (R⊕)	1.00	2.74	11.21
Mass (M⊕)	1.00	7.95	317.83
Density (g/cm³)	5.51	2.12	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	20.01	0.037

Star Catalogue Identifiers

TIC

TIC 239238425

Gaia DR2

Gaia DR2 2076102635879020928

Gaia DR3

Gaia DR3 2076102635879020928

System

Kepler-1118

Percentile among Sub-Neptune cohort

Radius 2.740 R⊕ · percentile 59 / cohort 1978

Mass 7.950 M⊕ · percentile 54 / cohort 1978

Orbital period 38.67 d · percentile 80 / cohort 1946

Distance 888.33 pc · percentile 71 / cohort 1975

ESI 0.477 · percentile 67 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

38.672 days

Semi-major axis

0.2079 AU

Eccentricity

0.000

Inclination

88.77 °

Year Length

A year here lasts approximately 38.67 Earth days (10.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2079 AU.

Transit Fingerprint

Depth

0.060 %

Duration

5.567 h

Impact parameter b

0.790

Rp / R★

0.025633

Transit midpoint (BJD)

2,454,990.6207

Photometric dip

Transit produces a flux drop of 599 ppm lasting ≈ 5.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025633

Semi-major axis / stellar radius

35.000

Impact parameter (b)

0.790

Transit mid-time (BJD)

2,454,990.6207

Angular separation (arcsec)

0.23400

Eq. Temperature

502K

(229 °C)

Insolation (S⊕)

20.01

Earth = 1.00

Earth Similarity (ESI)

0.477

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-1118

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,688 K — cooler than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.970 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

0.585 g/cm³

Metallicity ratio

[Fe/H]

Distance

888.33 parsec

Light-years 2,897.33 ly

V-band magnitude

15.24 mag

Voyager-speed travel 51,094,329 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.098 mas

Total Proper Motion

7.617 mas/yr

PM Right Ascension

-1.93 mas/yr

PM Declination

-7.37 mas/yr

Galactic Cartesian (pc)

x = 0.358 · y = -0.621 · z = 0.697

Equatorial (J2000)

RA 299.96566° · Dec 44.16088°

Galactic ℓ, b

79.182° · 7.462°

Ecliptic λ, β

320.715° · 62.425°

HTM-20 index

-1717425568