Key parameters at a glance

A radius of 2.22 Earth radii
A mass of 5.57 Earth masses
Surface gravity around 1.13 g
An orbital period of 13.627 days
Distance from Earth 269.60 light-years
Earth Similarity Index 0.747
Travel time at Voyager 1 speed 4,754,423 years
Almost certainly tidally locked to its host star given the close orbit

4 siblings around K2-384

K2-384 f shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-384 b	Rocky Terrestrial	1.08	1.26	2.232	—	2022
K2-384 c	Rocky Terrestrial	1.19	1.82	4.195	—	2022
K2-384 d	Super-Earth	1.39	2.52	6.680	—	2022
K2-384 e	Super-Earth	1.35	2.37	9.715	—	2022
K2-384 f this	Sub-Neptune	2.22	5.57	13.627	—	2022

K2-384 f Planet Profile

Physical Specs

Radius

2.22 R⊕

Radius (Jupiter)

0.198 R♃

Mass

5.57 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.79 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.747

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

#1640of 1978

top 82.9%

This planet

2.22R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1701 b 2.22 R⊕ Kepler-1151 b 2.22 R⊕ Kepler-938 b 2.22 R⊕

Metric	Earth	K2-384 f	Jupiter
Radius (R⊕)	1.00	2.22	11.21
Mass (M⊕)	1.00	5.57	317.83
Density (g/cm³)	5.51	2.79	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 399702475

Gaia DR2

Gaia DR2 2535107508776249856

Gaia DR3

Gaia DR3 2535107508776249856

System

K2-384

Percentile among Sub-Neptune cohort

Radius 2.222 R⊕ · percentile 17 / cohort 1978

Mass 5.570 M⊕ · percentile 17 / cohort 1978

Orbital period 13.63 d · percentile 46 / cohort 1946

Distance 82.66 pc · percentile 18 / cohort 1975

ESI 0.747 · percentile 97 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.627 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 13.63 Earth days (3.7% of a terrestrial year).

Transit Fingerprint

Depth

0.437 %

Duration

2.160 h

Impact parameter b

0.467

Rp / R★

0.058500

Transit midpoint (BJD)

2,457,392.6002

Photometric dip

Transit produces a flux drop of 4,370 ppm lasting ≈ 2.16 h.

Extended Orbital Architecture

Planet / star radius ratio

0.058500

Semi-major axis / stellar radius

47.700

Impact parameter (b)

0.467

Transit mid-time (BJD)

2,457,392.6002

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.747

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

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: K2-384

Spectral Class

M-type red dwarf

Effective Temperature

3,623 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.348 R☉

Stellar Mass

0.330 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.874 dex

Stellar density

11.200 g/cm³

Metallicity ratio

[Fe/H]

Distance

82.66 parsec

Light-years 269.60 ly

V-band magnitude

16.12 mag

Voyager-speed travel 4,754,423 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

12.070 mas

Total Proper Motion

119.199 mas/yr

PM Right Ascension

103.23 mas/yr

PM Declination

-59.60 mas/yr

Galactic Cartesian (pc)

x = 0.937 · y = 0.350 · z = 0.013

Equatorial (J2000)

RA 20.49984° · Dec 0.75097°

Galactic ℓ, b

138.934° · -61.168°

Ecliptic λ, β

19.214° · -7.312°

HTM-20 index

1044112844