Key parameters at a glance

A radius of 2.62 Earth radii
A mass of 7.37 Earth masses
Surface gravity around 1.07 g
An orbital period of 16.274 days
Equilibrium temperature 850 K (577 °C)
Distance from Earth 1,375.19 light-years
Earth Similarity Index 0.292
Travel time at Voyager 1 speed 24,251,494 years

K2-337 b Planet Profile

Physical Specs

Radius

2.62 R⊕

Radius (Jupiter)

0.234 R♃

Mass

7.37 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.25 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.292

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

#989of 1978

top 49.9%

This planet

2.62R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-815 c 2.62 R⊕ Kepler-977 b 2.62 R⊕ Kepler-450 c 2.62 R⊕

Metric	Earth	K2-337 b	Jupiter
Radius (R⊕)	1.00	2.62	11.21
Mass (M⊕)	1.00	7.37	317.83
Density (g/cm³)	5.51	2.25	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 20484888

Gaia DR2

Gaia DR2 658978451430055936

Gaia DR3

Gaia DR3 658978451430055936

System

K2-337

Percentile among Sub-Neptune cohort

Radius 2.620 R⊕ · percentile 50 / cohort 1978

Mass 7.370 M⊕ · percentile 46 / cohort 1978

Orbital period 16.27 d · percentile 54 / cohort 1946

Distance 421.64 pc · percentile 43 / cohort 1975

ESI 0.292 · percentile 26 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.274 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.14 °

Year Length

A year here lasts approximately 16.27 Earth days (4.5% of a terrestrial year).

Transit Fingerprint

Depth

0.042 %

Duration

7.640 h

Impact parameter b

0.380

Rp / R★

0.018000

Transit midpoint (BJD)

2,457,145.9635

Photometric dip

Transit produces a flux drop of 418 ppm lasting ≈ 7.64 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018000

Semi-major axis / stellar radius

15.390

Impact parameter (b)

0.380

Transit mid-time (BJD)

2,457,145.9635

Eq. Temperature

850K

(577 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.292

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: K2-337

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,869 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.320 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.27

Extended Stellar Properties

Surface gravity (log g)

4.170 dex

Stellar density

0.764 g/cm³

Metallicity ratio

[Fe/H]

Distance

421.64 parsec

Light-years 1,375.19 ly

V-band magnitude

12.39 mag

Voyager-speed travel 24,251,494 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.344 mas

Total Proper Motion

24.972 mas/yr

PM Right Ascension

-6.97 mas/yr

PM Declination

-23.98 mas/yr

Galactic Cartesian (pc)

x = -0.586 · y = 0.756 · z = 0.291

Equatorial (J2000)

RA 127.76114° · Dec 16.90047°

Galactic ℓ, b

207.991° · 29.414°

Ecliptic λ, β

125.889° · -1.958°

HTM-20 index

1802282488