Key parameters at a glance

A radius of 2.03 Earth radii
A mass of 4.78 Earth masses
Surface gravity around 1.16 g
An orbital period of 11.561 days
Equilibrium temperature 861 K (588 °C)
Distance from Earth 679.57 light-years
Earth Similarity Index 0.317
Travel time at Voyager 1 speed 11,984,196 years

K2-342 b Planet Profile

Physical Specs

Radius

2.03 R⊕

Radius (Jupiter)

0.181 R♃

Mass

4.78 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.14 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.317

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

#1915of 1978

top 96.8%

This planet

2.03R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 2030 b 2.03 R⊕ Kepler-37 d 2.03 R⊕ Kepler-195 b 2.03 R⊕

Metric	Earth	K2-342 b	Jupiter
Radius (R⊕)	1.00	2.03	11.21
Mass (M⊕)	1.00	4.78	317.83
Density (g/cm³)	5.51	3.14	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 197215129

Gaia DR2

Gaia DR2 685749360542215296

Gaia DR3

Gaia DR3 685749360542215296

System

K2-342

Percentile among Sub-Neptune cohort

Radius 2.030 R⊕ · percentile 3 / cohort 1978

Mass 4.780 M⊕ · percentile 5 / cohort 1978

Orbital period 11.56 d · percentile 40 / cohort 1946

Distance 208.36 pc · percentile 30 / cohort 1975

ESI 0.317 · percentile 32 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.561 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 11.56 Earth days (3.2% of a terrestrial year).

Transit Fingerprint

Depth

0.026 %

Duration

3.730 h

Impact parameter b

0.420

Rp / R★

0.015500

Transit midpoint (BJD)

2,458,099.1073

Photometric dip

Transit produces a flux drop of 255 ppm lasting ≈ 3.73 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015500

Semi-major axis / stellar radius

21.960

Impact parameter (b)

0.420

Transit mid-time (BJD)

2,458,099.1073

Eq. Temperature

861K

(588 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.317

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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: K2-342

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,920 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.090 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

1.241 g/cm³

Metallicity ratio

[Fe/H]

Distance

208.36 parsec

Light-years 679.57 ly

V-band magnitude

11.34 mag

Voyager-speed travel 11,984,196 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.771 mas

Total Proper Motion

86.902 mas/yr

PM Right Ascension

41.99 mas/yr

PM Declination

-76.08 mas/yr

Galactic Cartesian (pc)

x = -0.637 · y = 0.680 · z = 0.362

Equatorial (J2000)

RA 133.12190° · Dec 21.23868°

Galactic ℓ, b

205.276° · 35.679°

Ecliptic λ, β

129.665° · 3.540°

HTM-20 index

1647600536