Key parameters at a glance

A radius of 2.41 Earth radii
A mass of 6.39 Earth masses
Surface gravity around 1.10 g
An orbital period of 10.095 days
Semi-major axis 0.0886 AU
Equilibrium temperature 764 K (491 °C)
Distance from Earth 897.76 light-years
Earth Similarity Index 0.336
Travel time at Voyager 1 speed 15,832,009 years

1 sibling around K2-224

K2-224 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-224 b	Super-Earth	1.56	3.05	4.479	1,002	2018
K2-224 c this	Sub-Neptune	2.41	6.39	10.095	764	2018

K2-224 c Planet Profile

Physical Specs

Radius

2.41 R⊕

Radius (Jupiter)

0.215 R♃

Mass

6.39 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.51 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.336

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1312of 1978

top 66.3%

This planet

2.41R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-143 b 2.41 R⊕ Kepler-343 b 2.41 R⊕ GJ 536 b 2.41 R⊕

Metric	Earth	K2-224 c	Jupiter
Radius (R⊕)	1.00	2.41	11.21
Mass (M⊕)	1.00	6.39	317.83
Density (g/cm³)	5.51	2.51	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 32425577

Gaia DR2

Gaia DR2 3578783977588991360

Gaia DR3

Gaia DR3 3578783977588991360

System

K2-224

Percentile among Sub-Neptune cohort

Radius 2.410 R⊕ · percentile 33 / cohort 1978

Mass 6.390 M⊕ · percentile 31 / cohort 1978

Orbital period 10.09 d · percentile 35 / cohort 1946

Distance 275.26 pc · percentile 33 / cohort 1975

ESI 0.336 · percentile 37 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.095 days

Semi-major axis

0.0886 AU

Eccentricity

—

Inclination

88.68 °

Year Length

A year here lasts approximately 10.09 Earth days (2.8% of a terrestrial year) at a mean orbital distance of 0.0886 AU.

Transit Fingerprint

Depth

0.059 %

Duration

3.600 h

Impact parameter b

0.400

Rp / R★

0.026200

Transit midpoint (BJD)

2,457,588.4157

Photometric dip

Transit produces a flux drop of 593 ppm lasting ≈ 3.60 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026200

Semi-major axis / stellar radius

20.300

Impact parameter (b)

0.400

Transit mid-time (BJD)

2,457,588.4157

Angular separation (arcsec)

0.32200

Eq. Temperature

764K

(491 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.336

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Livingston et al. 2018

Instrument

Kepler CCD Array

Publication

2018-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-224

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,620 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.840 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

-0.19

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

2.735 g/cm³

Systemic radial velocity

-17.66 km/s

Metallicity ratio

[Fe/H]

Distance

275.26 parsec

Light-years 897.76 ly

V-band magnitude

12.70 mag

Voyager-speed travel 15,832,009 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

3.605 mas

Total Proper Motion

17.442 mas/yr

PM Right Ascension

11.84 mas/yr

PM Declination

12.81 mas/yr

Galactic Cartesian (pc)

x = -0.971 · y = -0.166 · z = -0.175

Equatorial (J2000)

RA 189.70414° · Dec -10.06059°

Galactic ℓ, b

297.803° · 52.685°

Ecliptic λ, β

192.867° · -5.408°

HTM-20 index

-709245783