Key parameters at a glance

A radius of 2.57 Earth radii
A mass of 7.12 Earth masses
Surface gravity around 1.08 g
An orbital period of 135.188 days
Semi-major axis 0.4842 AU
Equilibrium temperature 345 K (72 °C)
Distance from Earth 1,224.79 light-years
Earth Similarity Index 0.667
Travel time at Voyager 1 speed 21,599,127 years

Kepler-1718 b Planet Profile

Physical Specs

Radius

2.57 R⊕

Radius (Jupiter)

0.229 R♃

Mass

7.12 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.31 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.667

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1089of 1978

top 55.0%

This planet

2.57R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-218 b 2.57 R⊕ Kepler-1549 b 2.57 R⊕ Kepler-313 c 2.57 R⊕

Metric	Earth	Kepler-1718 b	Jupiter
Radius (R⊕)	1.00	2.57	11.21
Mass (M⊕)	1.00	7.12	317.83
Density (g/cm³)	5.51	2.31	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	3.70	0.037

Star Catalogue Identifiers

TIC

TIC 63212231

Gaia DR2

Gaia DR2 2125814129244571264

Gaia DR3

Gaia DR3 2125814129244571264

System

Kepler-1718

Percentile among Sub-Neptune cohort

Radius 2.569 R⊕ · percentile 45 / cohort 1978

Mass 7.120 M⊕ · percentile 42 / cohort 1978

Orbital period 135.19 d · percentile 96 / cohort 1946

Distance 375.52 pc · percentile 39 / cohort 1975

ESI 0.667 · percentile 90 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

135.188 days

Semi-major axis

0.4842 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 135.19 Earth days (37.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4842 AU.

Transit Fingerprint

Depth

0.066 %

Duration

8.819 h

Impact parameter b

0.760

Rp / R★

0.023453

Transit midpoint (BJD)

2,455,023.9329

Photometric dip

Transit produces a flux drop of 663 ppm lasting ≈ 8.82 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023453

Semi-major axis / stellar radius

119.823

Impact parameter (b)

0.760

Transit mid-time (BJD)

2,455,023.9329

Angular separation (arcsec)

1.29000

Eq. Temperature

345K

(72 °C)

Insolation (S⊕)

3.70

Earth = 1.00

Earth Similarity (ESI)

0.667

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1718

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,731 K — cooler than the Sun (5,778 K)

Estimated Age

10.72 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.906 R☉

Stellar Mass

0.846 M☉

Metallicity [Fe/H]

-0.32

Extended Stellar Properties

Surface gravity (log g)

4.451 dex

Stellar density

1.781 g/cm³

Metallicity ratio

[Fe/H]

Distance

375.52 parsec

Light-years 1,224.79 ly

V-band magnitude

12.82 mag

Voyager-speed travel 21,599,127 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.634 mas

Total Proper Motion

8.008 mas/yr

PM Right Ascension

1.68 mas/yr

PM Declination

7.83 mas/yr

Galactic Cartesian (pc)

x = 0.277 · y = -0.678 · z = 0.681

Equatorial (J2000)

RA 292.23492° · Dec 42.90946°

Galactic ℓ, b

75.353° · 11.786°

Ecliptic λ, β

308.276° · 63.424°

HTM-20 index

-211098072