Key parameters at a glance

A radius of 5.55 Earth radii
A mass of 26.30 Earth masses
Surface gravity around 0.85 g
An orbital period of 15.467 days
Equilibrium temperature 735 K (462 °C)
Distance from Earth 875.78 light-years
Earth Similarity Index 0.245
Travel time at Voyager 1 speed 15,444,340 years

K2-353 b Planet Profile

Physical Specs

Radius

5.55 R⊕

Radius (Jupiter)

0.495 R♃

Mass

26.30 M⊕

Mass (Jupiter)

0.083 M♃

Density

0.85 g/cm³

Surface Gravity

0.85 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.245

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#314of 574

top 54.5%

This planet

5.55R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-3862 b 5.53 R⊕ Kepler-460 c 5.52 R⊕ Kepler-951 b 5.59 R⊕

Metric	Earth	K2-353 b	Jupiter
Radius (R⊕)	1.00	5.55	11.21
Mass (M⊕)	1.00	26.30	317.83
Density (g/cm³)	5.51	0.85	1.33
Surface Gravity (g)	1.00	0.85	2.53
Insolation (S⊕)	1.00	33.06	0.037

Star Catalogue Identifiers

TIC

TIC 115010361

Gaia DR2

Gaia DR2 3638010855046147200

Gaia DR3

Gaia DR3 3638010855046147200

System

K2-353

Percentile among Neptune-like cohort

Radius 5.550 R⊕ · percentile 45 / cohort 574

Mass 26.300 M⊕ · percentile 44 / cohort 574

Orbital period 15.47 d · percentile 47 / cohort 524

Distance 268.52 pc · percentile 45 / cohort 572

ESI 0.245 · percentile 39 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

15.467 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 15.47 Earth days (4.2% of a terrestrial year).

Transit Fingerprint

Depth

0.238 %

Duration

3.390 h

Impact parameter b

0.770

Rp / R★

0.050300

Transit midpoint (BJD)

2,458,189.8518

Photometric dip

Transit produces a flux drop of 2,380 ppm lasting ≈ 3.39 h.

Extended Orbital Architecture

Planet / star radius ratio

0.050300

Semi-major axis / stellar radius

25.060

Impact parameter (b)

0.770

Transit mid-time (BJD)

2,458,189.8518

Eq. Temperature

735K

(462 °C)

Insolation (S⊕)

33.06

Earth = 1.00

Earth Similarity (ESI)

0.245

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

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: K2-353

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,698 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.990 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

-0.21

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.291 g/cm³

Metallicity ratio

[Fe/H]

Distance

268.52 parsec

Light-years 875.78 ly

V-band magnitude

12.34 mag

Voyager-speed travel 15,444,340 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.696 mas

Total Proper Motion

39.018 mas/yr

PM Right Ascension

-38.80 mas/yr

PM Declination

-4.08 mas/yr

Galactic Cartesian (pc)

x = -0.929 · y = -0.368 · z = -0.040

Equatorial (J2000)

RA 201.61686° · Dec -2.28190°

Galactic ℓ, b

320.322° · 59.402°

Ecliptic λ, β

200.834° · 6.309°

HTM-20 index

855933605