Key parameters at a glance

A radius of 5.24 Earth radii
A mass of 8.00 Earth masses
Surface gravity around 0.29 g
An orbital period of 14.789 days
Semi-major axis 0.1196 AU
Equilibrium temperature 827 K (554 °C)
Distance from Earth 6,065.56 light-years
Earth Similarity Index 0.182
Travel time at Voyager 1 speed 106,966,070 years

3 siblings around Kepler-223

Kepler-223 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-223 b	Sub-Neptune	2.99	7.40	7.384	1,042	2014
Kepler-223 c	Sub-Neptune	3.44	5.10	9.846	947	2014
Kepler-223 d this	Neptune-like	5.24	8.00	14.789	827	2014
Kepler-223 e	Neptune-like	4.60	4.80	19.726	751	2014

Kepler-223 d Planet Profile

Physical Specs

Radius

5.24 R⊕

Radius (Jupiter)

0.467 R♃

Mass

8.00 M⊕

Mass (Jupiter)

0.025 M♃

Density

0.31 g/cm³

Surface Gravity

0.29 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.182

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#350of 574

top 60.8%

This planet

5.24R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 10180 f 5.24 R⊕ Kepler-495 b 5.23 R⊕ Kepler-841 b 5.23 R⊕

Metric	Earth	Kepler-223 d	Jupiter
Radius (R⊕)	1.00	5.24	11.21
Mass (M⊕)	1.00	8.00	317.83
Density (g/cm³)	5.51	0.31	1.33
Surface Gravity (g)	1.00	0.29	2.53
Insolation (S⊕)	1.00	175.95	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 273876171

Gaia DR2

Gaia DR2 2086337508581280256

Gaia DR3

Gaia DR3 2086337508581280256

System

Kepler-223

Percentile among Neptune-like cohort

Radius 5.240 R⊕ · percentile 39 / cohort 574

Mass 8.000 M⊕ · percentile 3 / cohort 574

Orbital period 14.79 d · percentile 45 / cohort 524

Distance 1,859.71 pc · percentile 88 / cohort 572

ESI 0.182 · percentile 23 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

14.789 days

Semi-major axis

0.1196 AU

Eccentricity

0.037

Inclination

87.94 °

Year Length

A year here lasts approximately 14.79 Earth days (4.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1196 AU.

Transit Fingerprint

Depth

0.078 %

Duration

6.119 h

Impact parameter b

0.527

Rp / R★

0.025359

Transit midpoint (BJD)

2,455,704.8504

Photometric dip

Transit produces a flux drop of 782 ppm lasting ≈ 6.12 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025359

Semi-major axis / stellar radius

18.935

Impact parameter (b)

0.527

Transit mid-time (BJD)

2,455,704.8504

Angular separation (arcsec)

0.06430

Eq. Temperature

827K

(554 °C)

Insolation (S⊕)

175.95

Earth = 1.00

Earth Similarity (ESI)

0.182

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-223

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,803 K — hotter than the Sun (5,778 K)

Estimated Age

8.91 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.720 R☉

Stellar Mass

1.125 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

0.004 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,859.71 parsec

Light-years 6,065.56 ly

V-band magnitude

15.69 mag

Voyager-speed travel 106,966,070 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.510 mas

Total Proper Motion

11.864 mas/yr

PM Right Ascension

-4.27 mas/yr

PM Declination

-11.07 mas/yr

Galactic Cartesian (pc)

x = 0.322 · y = -0.597 · z = 0.735

Equatorial (J2000)

RA 298.31839° · Dec 47.27948°

Galactic ℓ, b

81.325° · 10.024°

Ecliptic λ, β

321.526° · 65.729°

HTM-20 index

153825552