Key parameters at a glance

A radius of 2.30 Earth radii
A mass of 5.89 Earth masses
Surface gravity around 1.12 g
An orbital period of 47.056 days
Semi-major axis 0.2524 AU
Equilibrium temperature 497 K (224 °C)
Distance from Earth 3,359.77 light-years
Earth Similarity Index 0.515
Travel time at Voyager 1 speed 59,249,463 years

Kepler-1918 b Planet Profile

Physical Specs

Radius

2.30 R⊕

Radius (Jupiter)

0.205 R♃

Mass

5.89 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.67 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.515

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

#1515of 1978

top 76.5%

This planet

2.30R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1669 c 2.30 R⊕ K2-138 c 2.30 R⊕ Kepler-633 c 2.30 R⊕

Metric	Earth	Kepler-1918 b	Jupiter
Radius (R⊕)	1.00	2.30	11.21
Mass (M⊕)	1.00	5.89	317.83
Density (g/cm³)	5.51	2.67	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	14.43	0.037

Star Catalogue Identifiers

TIC

TIC 63214893

Gaia DR2

Gaia DR2 2125711432287012992

Gaia DR3

Gaia DR3 2125711432287012992

System

Kepler-1918

Percentile among Sub-Neptune cohort

Radius 2.298 R⊕ · percentile 23 / cohort 1978

Mass 5.890 M⊕ · percentile 23 / cohort 1978

Orbital period 47.06 d · percentile 84 / cohort 1946

Distance 1,030.11 pc · percentile 80 / cohort 1975

ESI 0.515 · percentile 72 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

47.056 days

Semi-major axis

0.2524 AU

Eccentricity

0.000

Inclination

89.71 °

Year Length

A year here lasts approximately 47.06 Earth days (12.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2524 AU.

Transit Fingerprint

Depth

0.092 %

Duration

4.803 h

Impact parameter b

0.361

Rp / R★

0.027975

Transit midpoint (BJD)

2,455,006.9631

Photometric dip

Transit produces a flux drop of 921 ppm lasting ≈ 4.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027975

Semi-major axis / stellar radius

72.800

Impact parameter (b)

0.361

Transit mid-time (BJD)

2,455,006.9631

Angular separation (arcsec)

0.24500

Eq. Temperature

497K

(224 °C)

Insolation (S⊕)

14.43

Earth = 1.00

Earth Similarity (ESI)

0.515

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

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-1918

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,889 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.924 R☉

Stellar Mass

0.967 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.492 dex

Stellar density

3.159 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,030.11 parsec

Light-years 3,359.77 ly

V-band magnitude

15.53 mag

Voyager-speed travel 59,249,463 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.943 mas

Total Proper Motion

9.155 mas/yr

PM Right Ascension

-1.65 mas/yr

PM Declination

-9.01 mas/yr

Galactic Cartesian (pc)

x = 0.284 · y = -0.684 · z = 0.672

Equatorial (J2000)

RA 292.53055° · Dec 42.21458°

Galactic ℓ, b

74.816° · 11.283°

Ecliptic λ, β

308.216° · 62.696°

HTM-20 index

-167192450