Key parameters at a glance

A radius of 1.44 Earth radii
A mass of 2.67 Earth masses
Surface gravity around 1.29 g
An orbital period of 22.922 days
Semi-major axis 0.1570 AU
Equilibrium temperature 684 K (411 °C)
Distance from Earth 2,741.35 light-years
Earth Similarity Index 0.448
Travel time at Voyager 1 speed 48,343,722 years

Kepler-1218 b Planet Profile

Physical Specs

Radius

1.44 R⊕

Radius (Jupiter)

0.128 R♃

Mass

2.67 M⊕

Mass (Jupiter)

0.008 M♃

Density

4.91 g/cm³

Surface Gravity

1.29 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.448

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

#850of 1176

top 72.2%

This planet

1.44R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1245 b 1.44 R⊕ Kepler-1149 b 1.44 R⊕ TOI-237 b 1.44 R⊕

Metric	Earth	Kepler-1218 b	Jupiter
Radius (R⊕)	1.00	1.44	11.21
Mass (M⊕)	1.00	2.67	317.83
Density (g/cm³)	5.51	4.91	1.33
Surface Gravity (g)	1.00	1.29	2.53
Insolation (S⊕)	1.00	84.83	0.037

Star Catalogue Identifiers

TIC

TIC 159763595

Gaia DR2

Gaia DR2 2126191334752646016

Gaia DR3

Gaia DR3 2126191334752646016

System

Kepler-1218

Percentile among Super-Earth cohort

Radius 1.440 R⊕ · percentile 27 / cohort 1176

Mass 2.670 M⊕ · percentile 25 / cohort 1176

Orbital period 22.92 d · percentile 87 / cohort 1164

Distance 840.50 pc · percentile 71 / cohort 1171

ESI 0.448 · percentile 67 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

22.922 days

Semi-major axis

0.1570 AU

Eccentricity

0.000

Inclination

88.01 °

Year Length

A year here lasts approximately 22.92 Earth days (6.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1570 AU.

Transit Fingerprint

Depth

0.014 %

Duration

8.261 h

Impact parameter b

0.520

Rp / R★

0.011560

Transit midpoint (BJD)

2,454,966.6665

Photometric dip

Transit produces a flux drop of 140 ppm lasting ≈ 8.26 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011560

Semi-major axis / stellar radius

20.600

Impact parameter (b)

0.520

Transit mid-time (BJD)

2,454,966.6665

Angular separation (arcsec)

0.18700

Eq. Temperature

684K

(411 °C)

Insolation (S⊕)

84.83

Earth = 1.00

Earth Similarity (ESI)

0.448

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-1218

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,986 K — hotter than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.100 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

0.380 g/cm³

Metallicity ratio

[Fe/H]

Distance

840.50 parsec

Light-years 2,741.35 ly

V-band magnitude

13.73 mag

Voyager-speed travel 48,343,722 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.161 mas

Total Proper Motion

19.482 mas/yr

PM Right Ascension

-17.65 mas/yr

PM Declination

-8.24 mas/yr

Galactic Cartesian (pc)

x = 0.262 · y = -0.663 · z = 0.701

Equatorial (J2000)

RA 291.57885° · Dec 44.53168°

Galactic ℓ, b

76.635° · 12.921°

Ecliptic λ, β

308.527° · 65.110°

HTM-20 index

590341406