Key parameters at a glance

A radius of 2.23 Earth radii
A mass of 5.60 Earth masses
Surface gravity around 1.13 g
An orbital period of 14.871 days
Equilibrium temperature 727 K (454 °C)
Distance from Earth 574.20 light-years
Earth Similarity Index 0.364
Travel time at Voyager 1 speed 10,126,032 years

2 siblings around K2-352

K2-352 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-352 b	Super-Earth	1.37	2.45	3.666	1,160	2021
K2-352 c	Super-Earth	1.92	4.35	8.235	885	2021
K2-352 d this	Sub-Neptune	2.23	5.60	14.871	727	2021

K2-352 d Planet Profile

Physical Specs

Radius

2.23 R⊕

Radius (Jupiter)

0.199 R♃

Mass

5.60 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.77 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.364

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1622of 1978

top 82.0%

This planet

2.23R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-292 d 2.23 R⊕ Kepler-165 c 2.23 R⊕ Kepler-235 b 2.23 R⊕

Metric	Earth	K2-352 d	Jupiter
Radius (R⊕)	1.00	2.23	11.21
Mass (M⊕)	1.00	5.60	317.83
Density (g/cm³)	5.51	2.77	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 86130229

Gaia DR2

Gaia DR2 632634358985725184

Gaia DR3

Gaia DR3 632634358985725184

System

K2-352

Percentile among Sub-Neptune cohort

Radius 2.230 R⊕ · percentile 17 / cohort 1978

Mass 5.600 M⊕ · percentile 17 / cohort 1978

Orbital period 14.87 d · percentile 50 / cohort 1946

Distance 176.05 pc · percentile 27 / cohort 1975

ESI 0.364 · percentile 44 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.871 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 14.87 Earth days (4.1% of a terrestrial year).

Transit Fingerprint

Depth

0.190 %

Duration

4.140 h

Impact parameter b

0.390

Rp / R★

0.021400

Transit midpoint (BJD)

2,458,103.6228

Photometric dip

Transit produces a flux drop of 1,900 ppm lasting ≈ 4.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021400

Semi-major axis / stellar radius

25.940

Impact parameter (b)

0.390

Transit mid-time (BJD)

2,458,103.6228

Eq. Temperature

727K

(454 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.364

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

De Leon et al. 2021

Instrument

Kepler CCD Array

Publication

2021-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at K2 (12 shown).

EPIC 220492298 b · Rocky Terrestrial EPIC 206042996 c · Rocky Terrestrial EPIC 212624936 b · Rocky Terrestrial EPIC 206024342 c · Super-Earth EPIC 201427007 b · Super-Earth K2-332 b · Sub-Neptune EPIC 212624936 c · Sub-Neptune EPIC 206024342 d · Sub-Neptune K2-345 b · Sub-Neptune K2-349 b · Super-Earth K2-343 c · Sub-Neptune K2-346 b · Sub-Neptune

Host System: K2-352

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,791 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.950 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.778 g/cm³

Rotation period

17.59 days

Metallicity ratio

[Fe/H]

Distance

176.05 parsec

Light-years 574.20 ly

V-band magnitude

11.13 mag

Voyager-speed travel 10,126,032 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

5.652 mas

Total Proper Motion

21.493 mas/yr

PM Right Ascension

-7.24 mas/yr

PM Declination

20.24 mas/yr

Galactic Cartesian (pc)

x = -0.731 · y = 0.604 · z = 0.317

Equatorial (J2000)

RA 140.44515° · Dec 18.46963°

Galactic ℓ, b

211.549° · 41.250°

Ecliptic λ, β

137.070° · 2.889°

HTM-20 index

-2103810399