Key parameters at a glance

A radius of 5.33 Earth radii
A mass of 24.60 Earth masses
Surface gravity around 0.86 g
An orbital period of 33.590 days
Equilibrium temperature 949 K (676 °C)
Distance from Earth 804.30 light-years
Earth Similarity Index 0.192
Travel time at Voyager 1 speed 14,183,784 years

K2-403 b Planet Profile

Physical Specs

Radius

5.33 R⊕

Radius (Jupiter)

0.476 R♃

Mass

24.60 M⊕

Mass (Jupiter)

0.078 M♃

Density

0.89 g/cm³

Surface Gravity

0.86 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.192

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#337of 574

top 58.5%

This planet

5.33R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-2019 b 5.33 R⊕ K2-108 b 5.33 R⊕ Kepler-82 c 5.34 R⊕

Metric	Earth	K2-403 b	Jupiter
Radius (R⊕)	1.00	5.33	11.21
Mass (M⊕)	1.00	24.60	317.83
Density (g/cm³)	5.51	0.89	1.33
Surface Gravity (g)	1.00	0.86	2.53
Insolation (S⊕)	1.00	134.88	0.037

Star Catalogue Identifiers

TIC

TIC 365007485

Gaia DR2

Gaia DR2 3867810120985878272

Gaia DR3

Gaia DR3 3867810120985878272

System

K2-403

Percentile among Neptune-like cohort

Radius 5.333 R⊕ · percentile 41 / cohort 574

Mass 24.600 M⊕ · percentile 41 / cohort 574

Orbital period 33.59 d · percentile 62 / cohort 524

Distance 246.60 pc · percentile 43 / cohort 572

ESI 0.192 · percentile 26 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

33.590 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 33.59 Earth days (9.2% of a terrestrial year).

Transit Fingerprint

Depth

0.335 %

Duration

6.385 h

Impact parameter b

0.723

Rp / R★

0.055100

Transit midpoint (BJD)

2,457,908.9613

Photometric dip

Transit produces a flux drop of 3,352 ppm lasting ≈ 6.39 h.

Extended Orbital Architecture

Planet / star radius ratio

0.055100

Semi-major axis / stellar radius

39.870

Impact parameter (b)

0.723

Transit mid-time (BJD)

2,457,908.9613

Eq. Temperature

949K

(676 °C)

Insolation (S⊕)

134.88

Earth = 1.00

Earth Similarity (ESI)

0.192

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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: K2-403

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,511 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.886 R☉

Stellar Mass

0.784 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.439 dex

Stellar density

1.760 g/cm³

Metallicity ratio

[Fe/H]

Distance

246.60 parsec

Light-years 804.30 ly

V-band magnitude

12.31 mag

Voyager-speed travel 14,183,784 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.027 mas

Total Proper Motion

34.856 mas/yr

PM Right Ascension

-34.65 mas/yr

PM Declination

-3.80 mas/yr

Galactic Cartesian (pc)

x = -0.948 · y = 0.269 · z = 0.168

Equatorial (J2000)

RA 164.18939° · Dec 9.67395°

Galactic ℓ, b

240.302° · 57.821°

Ecliptic λ, β

161.719° · 2.713°

HTM-20 index

-55589184