Key parameters at a glance

A radius of 3.31 Earth radii
A mass of 699.22 Earth masses
Surface gravity around 63.82 g
An orbital period of 6.535 days
Semi-major axis 0.0630 AU
Equilibrium temperature 558 K (285 °C)
Distance from Earth 306.72 light-years
Earth Similarity Index 0.262
Travel time at Voyager 1 speed 5,409,094 years
Almost certainly tidally locked to its host star given the close orbit

K2-417 b Planet Profile

Physical Specs

Radius

3.31 R⊕

Radius (Jupiter)

0.295 R♃

Mass

699.22 M⊕

Mass (Jupiter)

2.200 M♃

Density

— g/cm³

Surface Gravity

63.82 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.262

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#272of 1978

top 13.7%

This planet

3.31R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

DMPP-1 c 3.31 R⊕ Kepler-606 b 3.31 R⊕ Kepler-207 d 3.31 R⊕

Metric	Earth	K2-417 b	Jupiter
Radius (R⊕)	1.00	3.31	11.21
Mass (M⊕)	1.00	699.22	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	63.82	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	699.223 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 49592509

Gaia DR2

Gaia DR2 2437684039751295744

Gaia DR3

Gaia DR3 2437684039751295744

System

K2-417

Percentile among Sub-Neptune cohort

Radius 3.310 R⊕ · percentile 86 / cohort 1978

Mass 699.223 M⊕ · percentile 99 / cohort 1978

Orbital period 6.54 d · percentile 20 / cohort 1946

Distance 94.04 pc · percentile 19 / cohort 1975

ESI 0.262 · percentile 19 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.535 days

Semi-major axis

0.0630 AU

Eccentricity

—

Inclination

89.00 °

Year Length

A year here lasts approximately 6.54 Earth days (1.8% of a terrestrial year) at a mean orbital distance of 0.0630 AU.

Transit Fingerprint

Duration

2.070 h

Impact parameter b

0.410

Rp / R★

0.052500

Transit midpoint (BJD)

2,458,373.0321

Extended Orbital Architecture

Planet / star radius ratio

0.052500

Semi-major axis / stellar radius

23.400

Impact parameter (b)

0.410

Transit mid-time (BJD)

2,458,373.0321

Angular separation (arcsec)

0.67000

Eq. Temperature

558K

(285 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.262

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Incha et al. 2023

Instrument

Kepler CCD Array

Publication

2023-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at K2 (4 shown).

K2-415 b · Rocky Terrestrial EPIC 229004835 b · Sub-Neptune K2-2016-BLG-0005L b · Gas Giant K2-416 b · Sub-Neptune

Host System: K2-417

Spectral Class

M-type red dwarf

Effective Temperature

3,861 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.578 R☉

Stellar Mass

0.569 M☉

Metallicity [Fe/H]

—

Distance

94.04 parsec

Light-years 306.72 ly

V-band magnitude

13.91 mag

Voyager-speed travel 5,409,094 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

10.605 mas

Total Proper Motion

196.562 mas/yr

PM Right Ascension

133.63 mas/yr

PM Declination

-144.15 mas/yr

Galactic Cartesian (pc)

x = 0.970 · y = -0.169 · z = -0.174

Equatorial (J2000)

RA 350.14177° · Dec -10.03659°

Galactic ℓ, b

67.197° · -62.604°

Ecliptic λ, β

346.995° · -5.327°

HTM-20 index

-394194327