Key parameters at a glance

A radius of 2.48 Earth radii
A mass of 6.72 Earth masses
Surface gravity around 1.09 g
An orbital period of 1.908 days
Distance from Earth 1,405.83 light-years
Earth Similarity Index 0.707
Travel time at Voyager 1 speed 24,791,872 years

K2-409 b Planet Profile

Physical Specs

Radius

2.48 R⊕

Radius (Jupiter)

0.221 R♃

Mass

6.72 M⊕

Mass (Jupiter)

0.021 M♃

Density

2.42 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.707

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

#1210of 1978

top 61.1%

This planet

2.48R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-4495 b 2.48 R⊕ HIP 97166 b 2.48 R⊕ Kepler-256 d 2.48 R⊕

Metric	Earth	K2-409 b	Jupiter
Radius (R⊕)	1.00	2.48	11.21
Mass (M⊕)	1.00	6.72	317.83
Density (g/cm³)	5.51	2.42	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 432261603

Gaia DR2

Gaia DR2 6307338080392893696

Gaia DR3

Gaia DR3 6307338080392893696

System

K2-409

Percentile among Sub-Neptune cohort

Radius 2.482 R⊕ · percentile 39 / cohort 1978

Mass 6.720 M⊕ · percentile 36 / cohort 1978

Orbital period 1.91 d · percentile 2 / cohort 1946

Distance 431.03 pc · percentile 43 / cohort 1975

ESI 0.707 · percentile 93 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

1.908 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 1.91 Earth days (0.5% of a terrestrial year).

Transit Fingerprint

Duration

2.500 h

Impact parameter b

0.418

Rp / R★

0.018500

Transit midpoint (BJD)

2,457,990.2841

Extended Orbital Architecture

Planet / star radius ratio

0.018500

Semi-major axis / stellar radius

5.320

Impact parameter (b)

0.418

Transit mid-time (BJD)

2,457,990.2841

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.707

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: K2-409

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,742 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.228 R☉

Stellar Mass

0.886 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.204 dex

Stellar density

0.679 g/cm³

Metallicity ratio

[Fe/H]

Distance

431.03 parsec

Light-years 1,405.83 ly

V-band magnitude

12.90 mag

Voyager-speed travel 24,791,872 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.292 mas

Total Proper Motion

25.721 mas/yr

PM Right Ascension

21.97 mas/yr

PM Declination

-13.38 mas/yr

Galactic Cartesian (pc)

x = -0.636 · y = -0.718 · z = -0.282

Equatorial (J2000)

RA 228.45511° · Dec -16.35130°

Galactic ℓ, b

345.581° · 34.475°

Ecliptic λ, β

230.456° · 1.569°

HTM-20 index

-1399919327