Key parameters at a glance

A radius of 2.99 Earth radii
A mass of 7.40 Earth masses
Surface gravity around 0.83 g
An orbital period of 7.384 days
Semi-major axis 0.0753 AU
Equilibrium temperature 1,042 K (769 °C)
Distance from Earth 6,065.56 light-years
Earth Similarity Index 0.216
Travel time at Voyager 1 speed 106,966,070 years

3 siblings around Kepler-223

Kepler-223 b 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 this	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	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 b Planet Profile

Physical Specs

Radius

2.99 R⊕

Radius (Jupiter)

0.267 R♃

Mass

7.40 M⊕

Mass (Jupiter)

0.023 M♃

Density

1.54 g/cm³

Surface Gravity

0.83 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.216

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

#529of 1978

top 26.7%

This planet

2.99R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-255 c 2.99 R⊕ Kepler-978 b 2.99 R⊕ MOA-2010-BLG-328L b 2.99 R⊕

Metric	Earth	Kepler-223 b	Jupiter
Radius (R⊕)	1.00	2.99	11.21
Mass (M⊕)	1.00	7.40	317.83
Density (g/cm³)	5.51	1.54	1.33
Surface Gravity (g)	1.00	0.83	2.53
Insolation (S⊕)	1.00	444.05	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.400 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 Sub-Neptune cohort

Radius 2.990 R⊕ · percentile 73 / cohort 1978

Mass 7.400 M⊕ · percentile 46 / cohort 1978

Orbital period 7.38 d · percentile 24 / cohort 1946

Distance 1,859.71 pc · percentile 97 / cohort 1975

ESI 0.216 · percentile 9 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.384 days

Semi-major axis

0.0753 AU

Eccentricity

0.078

Inclination

90.00 °

Year Length

A year here lasts approximately 7.38 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0752 AU.

Transit Fingerprint

Depth

0.035 %

Duration

5.735 h

Impact parameter b

0.040

Rp / R★

0.016418

Transit midpoint (BJD)

2,455,701.5155

Photometric dip

Transit produces a flux drop of 350 ppm lasting ≈ 5.74 h.

Extended Orbital Architecture

Planet / star radius ratio

0.016418

Semi-major axis / stellar radius

10.690

Impact parameter (b)

0.040

Transit mid-time (BJD)

2,455,701.5155

Angular separation (arcsec)

0.04050

Eq. Temperature

1,042K

(769 °C)

Insolation (S⊕)

444.05

Earth = 1.00

Earth Similarity (ESI)

0.216

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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