Key parameters at a glance

A radius of 1.16 Earth radii
A mass of 1.67 Earth masses
Surface gravity around 1.23 g
An orbital period of 3.865 days
Distance from Earth 203.46 light-years
Earth Similarity Index 0.954
Travel time at Voyager 1 speed 3,587,971 years
Almost certainly tidally locked to its host star given the close orbit

K2-400 b Planet Profile

Physical Specs

Radius

1.16 R⊕

Radius (Jupiter)

0.104 R♃

Mass

1.67 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.83 g/cm³

Surface Gravity

1.23 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.954

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

#146of 570

top 25.4%

This planet

1.16R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1939 b 1.16 R⊕ OGLE-2013-BLG-0341L B b 1.16 R⊕ Kepler-316 c 1.16 R⊕

Metric	Earth	K2-400 b	Jupiter
Radius (R⊕)	1.00	1.16	11.21
Mass (M⊕)	1.00	1.67	317.83
Density (g/cm³)	5.51	5.83	1.33
Surface Gravity (g)	1.00	1.23	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 345034874

Gaia DR2

Gaia DR2 3859918999047978240

Gaia DR3

Gaia DR3 3859918999047978240

System

K2-400

Percentile among Rocky Terrestrial cohort

Radius 1.163 R⊕ · percentile 74 / cohort 570

Mass 1.670 M⊕ · percentile 68 / cohort 570

Orbital period 3.87 d · percentile 42 / cohort 567

Distance 62.38 pc · percentile 19 / cohort 566

ESI 0.954 · percentile 95 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

3.865 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 3.87 Earth days (1.1% of a terrestrial year).

Transit Fingerprint

Duration

1.600 h

Impact parameter b

0.208

Rp / R★

0.027900

Transit midpoint (BJD)

2,457,908.6234

Extended Orbital Architecture

Planet / star radius ratio

0.027900

Semi-major axis / stellar radius

19.120

Impact parameter (b)

0.208

Transit mid-time (BJD)

2,457,908.6234

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.954

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 K2-384 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 K2-368 c · Super-Earth

Host System: K2-400

Spectral Class

M-type red dwarf

Effective Temperature

3,578 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.382 R☉

Stellar Mass

0.374 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.847 dex

Stellar density

9.350 g/cm³

Metallicity ratio

[Fe/H]

Distance

62.38 parsec

Light-years 203.46 ly

V-band magnitude

15.11 mag

Voyager-speed travel 3,587,971 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

16.002 mas

Total Proper Motion

76.738 mas/yr

PM Right Ascension

-69.35 mas/yr

PM Declination

32.86 mas/yr

Galactic Cartesian (pc)

x = -0.901 · y = 0.429 · z = 0.064

Equatorial (J2000)

RA 154.51103° · Dec 3.69693°

Galactic ℓ, b

238.744° · 46.546°

Ecliptic λ, β

155.017° · -6.411°

HTM-20 index

-1586283936