Key parameters at a glance

A radius of 2.66 Earth radii
A mass of 1,652.71 Earth masses
Surface gravity around 233.58 g
An orbital period of 13.102 days
Semi-major axis 0.0880 AU
Equilibrium temperature 447 K (174 °C)
Distance from Earth 392.40 light-years
Earth Similarity Index 0.312
Travel time at Voyager 1 speed 6,920,001 years
Almost certainly tidally locked to its host star given the close orbit

K2-416 b Planet Profile

Physical Specs

Radius

2.66 R⊕

Radius (Jupiter)

0.237 R♃

Mass

1,652.71 M⊕

Mass (Jupiter)

5.200 M♃

Density

— g/cm³

Surface Gravity

233.58 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.312

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

#928of 1978

top 46.9%

This planet

2.66R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-346 b 2.66 R⊕ KOI-351 e 2.66 R⊕ Kepler-1987 d 2.66 R⊕

Metric	Earth	K2-416 b	Jupiter
Radius (R⊕)	1.00	2.66	11.21
Mass (M⊕)	1.00	1,652.71	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	233.58	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,652.708 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 301132473

Gaia DR2

Gaia DR2 2632278807386060288

Gaia DR3

Gaia DR3 2632278807386060288

System

K2-416

Percentile among Sub-Neptune cohort

Radius 2.660 R⊕ · percentile 52 / cohort 1978

Mass 1,652.708 M⊕ · percentile 100 / cohort 1978

Orbital period 13.10 d · percentile 45 / cohort 1946

Distance 120.31 pc · percentile 23 / cohort 1975

ESI 0.312 · percentile 31 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.102 days

Semi-major axis

0.0880 AU

Eccentricity

—

Inclination

89.25 °

Year Length

A year here lasts approximately 13.10 Earth days (3.6% of a terrestrial year) at a mean orbital distance of 0.0880 AU.

Transit Fingerprint

Duration

2.770 h

Impact parameter b

0.450

Rp / R★

0.044000

Transit midpoint (BJD)

2,458,371.8384

Extended Orbital Architecture

Planet / star radius ratio

0.044000

Semi-major axis / stellar radius

34.200

Impact parameter (b)

0.450

Transit mid-time (BJD)

2,458,371.8384

Angular separation (arcsec)

0.73100

Eq. Temperature

447K

(174 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.312

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 K2-417 b · Sub-Neptune

Host System: K2-416

Spectral Class

M-type red dwarf

Effective Temperature

3,746 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.554 R☉

Stellar Mass

0.548 M☉

Metallicity [Fe/H]

—

Distance

120.31 parsec

Light-years 392.40 ly

V-band magnitude

14.79 mag

Voyager-speed travel 6,920,001 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.283 mas

Total Proper Motion

107.249 mas/yr

PM Right Ascension

91.37 mas/yr

PM Declination

-56.17 mas/yr

Galactic Cartesian (pc)

x = 0.978 · y = -0.186 · z = -0.091

Equatorial (J2000)

RA 349.22118° · Dec -5.20150°

Galactic ℓ, b

72.954° · -58.572°

Ecliptic λ, β

348.052° · -0.521°

HTM-20 index

1284944881