Key parameters at a glance

A radius of 3.12 Earth radii
A mass of 9.93 Earth masses
Surface gravity around 1.02 g
An orbital period of 25.761 days
Distance from Earth 896.49 light-years
Earth Similarity Index 0.626
Travel time at Voyager 1 speed 15,809,520 years

1 sibling around K2-396

K2-396 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-396 b	Super-Earth	1.58	3.12	0.674	—	2022
K2-396 c this	Sub-Neptune	3.12	9.93	25.761	—	2022

K2-396 c Planet Profile

Physical Specs

Radius

3.12 R⊕

Radius (Jupiter)

0.279 R♃

Mass

9.93 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.79 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.626

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

#416of 1978

top 21.0%

This planet

3.12R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1709 b 3.12 R⊕ Kepler-1675 b 3.12 R⊕ Kepler-1791 b 3.12 R⊕

Metric	Earth	K2-396 c	Jupiter
Radius (R⊕)	1.00	3.12	11.21
Mass (M⊕)	1.00	9.93	317.83
Density (g/cm³)	5.51	1.79	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 59088823

Gaia DR2

Gaia DR2 3405720400701167104

Gaia DR3

Gaia DR3 3405720400701167104

System

K2-396

Percentile among Sub-Neptune cohort

Radius 3.124 R⊕ · percentile 79 / cohort 1978

Mass 9.930 M⊕ · percentile 72 / cohort 1978

Orbital period 25.76 d · percentile 70 / cohort 1946

Distance 274.86 pc · percentile 33 / cohort 1975

ESI 0.626 · percentile 86 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

25.761 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 25.76 Earth days (7.1% of a terrestrial year).

Transit Fingerprint

Impact parameter b

0.475

Rp / R★

0.031100

Transit midpoint (BJD)

2,457,829.4180

Extended Orbital Architecture

Planet / star radius ratio

0.031100

Semi-major axis / stellar radius

39.310

Impact parameter (b)

0.475

Transit mid-time (BJD)

2,457,829.4180

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.626

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: K2-396

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,236 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.920 R☉

Stellar Mass

0.954 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.488 dex

Stellar density

1.376 g/cm³

Metallicity ratio

[Fe/H]

Distance

274.86 parsec

Light-years 896.49 ly

V-band magnitude

13.32 mag

Voyager-speed travel 15,809,520 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

3.610 mas

Total Proper Motion

39.723 mas/yr

PM Right Ascension

-0.19 mas/yr

PM Declination

-39.72 mas/yr

Galactic Cartesian (pc)

x = 0.252 · y = 0.921 · z = 0.297

Equatorial (J2000)

RA 74.69286° · Dec 17.26906°

Galactic ℓ, b

183.771° · -15.415°

Ecliptic λ, β

75.328° · -5.394°

HTM-20 index

-1631104290