Key parameters at a glance

A radius of 3.32 Earth radii
A mass of 15.20 Earth masses
Surface gravity around 1.38 g
An orbital period of 58.020 days
Semi-major axis 0.2790 AU
Equilibrium temperature 410 K (137 °C)
Distance from Earth 501.22 light-years
Earth Similarity Index 0.550
Travel time at Voyager 1 speed 8,839,076 years

3 siblings around Kepler-411

Kepler-411 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-411 b	Sub-Neptune	2.40	25.60	3.005	1,138	2013
Kepler-411 c	Neptune-like	4.42	26.40	7.834	838	2016
Kepler-411 e	Sub-Neptune	3.28	10.80	31.510	503	2018
Kepler-411 d this	Sub-Neptune	3.32	15.20	58.020	410	2018

Kepler-411 d Planet Profile

Physical Specs

Radius

3.32 R⊕

Radius (Jupiter)

0.296 R♃

Mass

15.20 M⊕

Mass (Jupiter)

0.048 M♃

Density

2.30 g/cm³

Surface Gravity

1.38 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.550

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#271of 1978

top 13.7%

This planet

3.32R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-620 b 3.32 R⊕ Kepler-739 b 3.32 R⊕ Kepler-1270 b 3.32 R⊕

Metric	Earth	Kepler-411 d	Jupiter
Radius (R⊕)	1.00	3.32	11.21
Mass (M⊕)	1.00	15.20	317.83
Density (g/cm³)	5.51	2.30	1.33
Surface Gravity (g)	1.00	1.38	2.53
Insolation (S⊕)	1.00	3.90	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	15.200 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 399954349

Gaia DR2

Gaia DR2 2132768952604988672

Gaia DR3

Gaia DR3 2132768956905956352

System

Kepler-411

Percentile among Sub-Neptune cohort

Radius 3.319 R⊕ · percentile 86 / cohort 1978

Mass 15.200 M⊕ · percentile 93 / cohort 1978

Orbital period 58.02 d · percentile 88 / cohort 1946

Distance 153.68 pc · percentile 25 / cohort 1975

ESI 0.550 · percentile 76 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

58.020 days

Semi-major axis

0.2790 AU

Eccentricity

0.128

Inclination

89.43 °

Year Length

A year here lasts approximately 58.02 Earth days (15.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2790 AU.

Transit Fingerprint

Depth

0.130 %

Duration

5.669 h

Impact parameter b

0.719

Rp / R★

0.037200

Transit midpoint (BJD)

2,454,984.8484

Photometric dip

Transit produces a flux drop of 1,297 ppm lasting ≈ 5.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.037200

Semi-major axis / stellar radius

35.690

Impact parameter (b)

0.719

Transit mid-time (BJD)

2,454,984.8484

Long. of periastron (ω)

30.50°

Angular separation (arcsec)

1.82000

Eq. Temperature

410K

(137 °C)

Insolation (S⊕)

3.90

Earth = 1.00

Earth Similarity (ESI)

0.550

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Sun et al. 2019

Instrument

Kepler CCD Array

Publication

2019-04

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at Kepler (6 shown).

KOI-3680 b · Gas Giant Kepler-411 e · Sub-Neptune Kepler-1654 b · Neptune-like Kepler-1656 b · Neptune-like Kepler-1655 b · Sub-Neptune Kepler-730 c · Super-Earth

Host System: Kepler-411

Spectral Class

K-type orange

Effective Temperature

4,974 K — cooler than the Sun (5,778 K)

Estimated Age

0.21 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

1.940 g/cm³

Systemic radial velocity

-20.69 km/s

Rotation period

10.40 days

Metallicity ratio

[Fe/H]

Distance

153.68 parsec

Light-years 501.22 ly

V-band magnitude

12.45 mag

Voyager-speed travel 8,839,076 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

6.478 mas

Total Proper Motion

35.294 mas/yr

PM Right Ascension

13.52 mas/yr

PM Declination

32.60 mas/yr

Galactic Cartesian (pc)

x = 0.196 · y = -0.619 · z = 0.761

Equatorial (J2000)

RA 287.60570° · Dec 49.52339°

Galactic ℓ, b

80.249° · 17.401°

Ecliptic λ, β

306.521° · 70.738°

HTM-20 index

719364788

Similar Worlds

Kepler-1270 b

Sub-Neptune · K-type orange

Radius 3.32 R⊕ · 3,571.6 ly

TOI-1472 c

Sub-Neptune · K-type orange

Radius 3.33 R⊕ · 397.4 ly

Kepler-1663 b

Sub-Neptune · K-type orange

Radius 3.30 R⊕ · 1,102.2 ly

K2-266 b

Sub-Neptune · K-type orange

Radius 3.30 R⊕ · 253.0 ly

Kepler-305 c

Sub-Neptune · K-type orange

Radius 3.30 R⊕ · 2,832.6 ly

TOI-431 d

Sub-Neptune · K-type orange

Radius 3.29 R⊕ · 106.2 ly

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