Key parameters at a glance

A radius of 2.58 Earth radii
A mass of 7.18 Earth masses
Surface gravity around 1.08 g
An orbital period of 49.101 days
Semi-major axis 0.2530 AU
Equilibrium temperature 498 K (225 °C)
Distance from Earth 3,294.21 light-years
Earth Similarity Index 0.492
Travel time at Voyager 1 speed 58,093,359 years

Kepler-1018 b Planet Profile

Physical Specs

Radius

2.58 R⊕

Radius (Jupiter)

0.230 R♃

Mass

7.18 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.30 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.492

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

#1057of 1978

top 53.4%

This planet

2.58R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-73 b 2.58 R⊕ Kepler-169 f 2.58 R⊕ Kepler-461 b 2.58 R⊕

Metric	Earth	Kepler-1018 b	Jupiter
Radius (R⊕)	1.00	2.58	11.21
Mass (M⊕)	1.00	7.18	317.83
Density (g/cm³)	5.51	2.30	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	12.10	0.037

Star Catalogue Identifiers

TIC

TIC 164555061

Gaia DR2

Gaia DR2 2107016126838707200

Gaia DR3

Gaia DR3 2107016126838707200

System

Kepler-1018

Percentile among Sub-Neptune cohort

Radius 2.580 R⊕ · percentile 46 / cohort 1978

Mass 7.180 M⊕ · percentile 43 / cohort 1978

Orbital period 49.10 d · percentile 85 / cohort 1946

Distance 1,010.01 pc · percentile 78 / cohort 1975

ESI 0.492 · percentile 69 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

49.101 days

Semi-major axis

0.2530 AU

Eccentricity

0.000

Inclination

89.43 °

Year Length

A year here lasts approximately 49.10 Earth days (13.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2530 AU.

Transit Fingerprint

Depth

0.086 %

Duration

6.323 h

Impact parameter b

0.398

Rp / R★

0.027032

Transit midpoint (BJD)

2,454,969.4699

Photometric dip

Transit produces a flux drop of 856 ppm lasting ≈ 6.32 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027032

Semi-major axis / stellar radius

46.000

Impact parameter (b)

0.398

Transit mid-time (BJD)

2,454,969.4699

Angular separation (arcsec)

0.25000

Eq. Temperature

498K

(225 °C)

Insolation (S⊕)

12.10

Earth = 1.00

Earth Similarity (ESI)

0.492

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-1018

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,518 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.880 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

1.391 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,010.01 parsec

Light-years 3,294.21 ly

V-band magnitude

15.10 mag

Voyager-speed travel 58,093,359 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.962 mas

Total Proper Motion

5.622 mas/yr

PM Right Ascension

5.57 mas/yr

PM Declination

-0.72 mas/yr

Galactic Cartesian (pc)

x = 0.165 · y = -0.682 · z = 0.712

Equatorial (J2000)

RA 283.59673° · Dec 45.40787°

Galactic ℓ, b

75.193° · 18.462°

Ecliptic λ, β

295.705° · 67.637°

HTM-20 index

513693934