Key parameters at a glance

A radius of 1.56 Earth radii
A mass of 3.05 Earth masses
Surface gravity around 1.25 g
An orbital period of 3.793 days
Equilibrium temperature 543 K (270 °C)
Distance from Earth 299.16 light-years
Earth Similarity Index 0.544
Travel time at Voyager 1 speed 5,275,630 years
Almost certainly tidally locked to its host star given the close orbit

K2-354 b Planet Profile

Physical Specs

Radius

1.56 R⊕

Radius (Jupiter)

0.139 R♃

Mass

3.05 M⊕

Mass (Jupiter)

0.010 M♃

Density

4.41 g/cm³

Surface Gravity

1.25 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.544

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

#636of 1176

top 54.0%

This planet

1.56R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-338 e 1.56 R⊕ Kepler-402 c 1.56 R⊕ Kepler-309 b 1.56 R⊕

Metric	Earth	K2-354 b	Jupiter
Radius (R⊕)	1.00	1.56	11.21
Mass (M⊕)	1.00	3.05	317.83
Density (g/cm³)	5.51	4.41	1.33
Surface Gravity (g)	1.00	1.25	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 468989066

Gaia DR2

Gaia DR2 601314254872894080

Gaia DR3

Gaia DR3 601314254872894080

System

K2-354

Percentile among Super-Earth cohort

Radius 1.560 R⊕ · percentile 45 / cohort 1176

Mass 3.050 M⊕ · percentile 41 / cohort 1176

Orbital period 3.79 d · percentile 30 / cohort 1164

Distance 91.72 pc · percentile 16 / cohort 1171

ESI 0.544 · percentile 76 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.793 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 3.79 Earth days (1.0% of a terrestrial year).

Transit Fingerprint

Depth

0.101 %

Duration

1.530 h

Impact parameter b

0.240

Rp / R★

0.035300

Transit midpoint (BJD)

2,457,140.2260

Photometric dip

Transit produces a flux drop of 1,007 ppm lasting ≈ 1.53 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035300

Semi-major axis / stellar radius

19.050

Impact parameter (b)

0.240

Transit mid-time (BJD)

2,457,140.2260

Eq. Temperature

543K

(270 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.544

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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: K2-354

Spectral Class

M-type red dwarf

Effective Temperature

3,669 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.410 R☉

Stellar Mass

0.430 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.860 dex

Stellar density

7.810 g/cm³

Metallicity ratio

[Fe/H]

Distance

91.72 parsec

Light-years 299.16 ly

V-band magnitude

15.30 mag

Voyager-speed travel 5,275,630 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

10.874 mas

Total Proper Motion

16.679 mas/yr

PM Right Ascension

0.19 mas/yr

PM Declination

-16.68 mas/yr

Galactic Cartesian (pc)

x = -0.621 · y = 0.764 · z = 0.176

Equatorial (J2000)

RA 129.12992° · Dec 10.14722°

Galactic ℓ, b

215.648° · 27.910°

Ecliptic λ, β

128.868° · -8.169°

HTM-20 index

-372232543