Key parameters at a glance

A radius of 1.22 Earth radii
A mass of 1.98 Earth masses
Surface gravity around 1.33 g
An orbital period of 21.195 days
Equilibrium temperature 569 K (296 °C)
Distance from Earth 780.46 light-years
Earth Similarity Index 0.547
Travel time at Voyager 1 speed 13,763,331 years

K2-336 b Planet Profile

Physical Specs

Radius

1.22 R⊕

Radius (Jupiter)

0.109 R♃

Mass

1.98 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.99 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.547

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

#35of 570

top 6.0%

This planet

1.22R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-295 b 1.22 R⊕ Kepler-226 d 1.22 R⊕ Kepler-197 d 1.22 R⊕

Metric	Earth	K2-336 b	Jupiter
Radius (R⊕)	1.00	1.22	11.21
Mass (M⊕)	1.00	1.98	317.83
Density (g/cm³)	5.51	5.99	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 46382728

Gaia DR2

Gaia DR2 611580390645372672

Gaia DR3

Gaia DR3 611580390645372672

System

K2-336

Percentile among Rocky Terrestrial cohort

Radius 1.220 R⊕ · percentile 92 / cohort 570

Mass 1.980 M⊕ · percentile 83 / cohort 570

Orbital period 21.19 d · percentile 92 / cohort 567

Distance 239.29 pc · percentile 33 / cohort 566

ESI 0.547 · percentile 74 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

21.195 days

Semi-major axis

— AU

Eccentricity

—

Inclination

89.03 °

Year Length

A year here lasts approximately 21.19 Earth days (5.8% of a terrestrial year).

Transit Fingerprint

Depth

0.026 %

Duration

4.650 h

Impact parameter b

0.410

Rp / R★

0.014000

Transit midpoint (BJD)

2,457,146.5856

Photometric dip

Transit produces a flux drop of 263 ppm lasting ≈ 4.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014000

Semi-major axis / stellar radius

32.370

Impact parameter (b)

0.410

Transit mid-time (BJD)

2,457,146.5856

Eq. Temperature

569K

(296 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.547

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: K2-336

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,424 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.800 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

-0.17

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

2.525 g/cm³

Metallicity ratio

[Fe/H]

Distance

239.29 parsec

Light-years 780.46 ly

V-band magnitude

12.80 mag

Voyager-speed travel 13,763,331 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.151 mas

Total Proper Motion

41.581 mas/yr

PM Right Ascension

31.73 mas/yr

PM Declination

-26.87 mas/yr

Galactic Cartesian (pc)

x = -0.663 · y = 0.691 · z = 0.289

Equatorial (J2000)

RA 133.83820° · Dec 16.79407°

Galactic ℓ, b

210.668° · 34.772°

Ecliptic λ, β

131.534° · -0.549°

HTM-20 index

-610252492