Key parameters at a glance

A radius of 2.42 Earth radii
A mass of 6.42 Earth masses
Surface gravity around 1.10 g
An orbital period of 3.572 days
Distance from Earth 650.21 light-years
Earth Similarity Index 0.716
Travel time at Voyager 1 speed 11,466,365 years

K2-397 b Planet Profile

Physical Specs

Radius

2.42 R⊕

Radius (Jupiter)

0.216 R♃

Mass

6.42 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.50 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.716

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1307of 1978

top 66.0%

This planet

2.42R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-178 f 2.42 R⊕ TOI-1630.01 2.42 R⊕ TOI-4308 b 2.42 R⊕

Metric	Earth	K2-397 b	Jupiter
Radius (R⊕)	1.00	2.42	11.21
Mass (M⊕)	1.00	6.42	317.83
Density (g/cm³)	5.51	2.50	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 6139066

Gaia DR2

Gaia DR2 3414370975935397888

Gaia DR3

Gaia DR3 3414370975935397888

System

K2-397

Percentile among Sub-Neptune cohort

Radius 2.417 R⊕ · percentile 34 / cohort 1978

Mass 6.420 M⊕ · percentile 32 / cohort 1978

Orbital period 3.57 d · percentile 7 / cohort 1946

Distance 199.35 pc · percentile 29 / cohort 1975

ESI 0.716 · percentile 94 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.572 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 3.57 Earth days (1.0% of a terrestrial year).

Transit Fingerprint

Duration

1.300 h

Impact parameter b

0.892

Rp / R★

0.022900

Transit midpoint (BJD)

2,457,823.5751

Extended Orbital Architecture

Planet / star radius ratio

0.022900

Semi-major axis / stellar radius

10.110

Impact parameter (b)

0.892

Transit mid-time (BJD)

2,457,823.5751

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.716

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Christiansen et al. 2022

Instrument

Kepler CCD Array

Publication

2022-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at K2 (12 shown).

K2-411 b · Rocky Terrestrial K2-381 b · Rocky Terrestrial K2-384 b · Rocky Terrestrial K2-400 b · Rocky Terrestrial K2-384 c · Rocky Terrestrial K2-369 b · Super-Earth K2-407 b · Super-Earth K2-414 b · Rocky Terrestrial K2-368 b · Super-Earth K2-413 c · Rocky Terrestrial K2-384 e · Super-Earth K2-407 c · Super-Earth

Host System: K2-397

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,387 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.966 R☉

Stellar Mass

0.937 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.435 dex

Stellar density

1.474 g/cm³

Metallicity ratio

[Fe/H]

Distance

199.35 parsec

Light-years 650.21 ly

V-band magnitude

11.87 mag

Voyager-speed travel 11,466,365 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

4.988 mas

Total Proper Motion

25.973 mas/yr

PM Right Ascension

24.50 mas/yr

PM Declination

-8.64 mas/yr

Galactic Cartesian (pc)

x = 0.163 · y = 0.918 · z = 0.363

Equatorial (J2000)

RA 79.95166° · Dec 21.25916°

Galactic ℓ, b

183.310° · -9.063°

Ecliptic λ, β

80.633° · -1.854°

HTM-20 index

-817158549