Key parameters at a glance

A radius of 2.40 Earth radii
A mass of 25.60 Earth masses
Surface gravity around 4.44 g
An orbital period of 3.005 days
Semi-major axis 0.0375 AU
Equilibrium temperature 1,138 K (865 °C)
Distance from Earth 501.22 light-years
Earth Similarity Index 0.208
Travel time at Voyager 1 speed 8,839,076 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around Kepler-411

Kepler-411 b 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 this	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	Sub-Neptune	3.32	15.20	58.020	410	2018

Kepler-411 b Planet Profile

Physical Specs

Radius

2.40 R⊕

Radius (Jupiter)

0.214 R♃

Mass

25.60 M⊕

Mass (Jupiter)

0.081 M♃

Density

10.30 g/cm³

Surface Gravity

4.44 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.208

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1332of 1978

top 67.3%

This planet

2.40R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1269 b 2.40 R⊕ KIC 8540376 c 2.40 R⊕ Kepler-112 c 2.40 R⊕

Metric	Earth	Kepler-411 b	Jupiter
Radius (R⊕)	1.00	2.40	11.21
Mass (M⊕)	1.00	25.60	317.83
Density (g/cm³)	5.51	10.30	1.33
Surface Gravity (g)	1.00	4.44	2.53
Insolation (S⊕)	1.00	201.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	25.600 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 2.401 R⊕ · percentile 33 / cohort 1978

Mass 25.600 M⊕ · percentile 96 / cohort 1978

Orbital period 3.01 d · percentile 5 / cohort 1946

Distance 153.68 pc · percentile 25 / cohort 1975

ESI 0.208 · percentile 8 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.005 days

Semi-major axis

0.0375 AU

Eccentricity

0.146

Inclination

87.40 °

Year Length

A year here lasts approximately 3.01 Earth days (0.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0375 AU.

Transit Fingerprint

Depth

0.069 %

Duration

1.969 h

Impact parameter b

0.574

Rp / R★

0.026600

Transit midpoint (BJD)

2,455,135.3874

Photometric dip

Transit produces a flux drop of 690 ppm lasting ≈ 1.97 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026600

Semi-major axis / stellar radius

11.926

Impact parameter (b)

0.574

Transit mid-time (BJD)

2,455,135.3874

Long. of periastron (ω)

41.50°

Angular separation (arcsec)

0.24400

Eq. Temperature

1,138K

(865 °C)

Insolation (S⊕)

201.30

Earth = 1.00

Earth Similarity (ESI)

0.208

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

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

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Wang et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 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

HIP 113103 c

Sub-Neptune · K-type orange

Radius 2.40 R⊕ · 150.7 ly

Kepler-1321 c

Sub-Neptune · K-type orange

Radius 2.40 R⊕ · 2,508.6 ly

Kepler-1170 b

Sub-Neptune · K-type orange

Radius 2.41 R⊕ · 3,426.1 ly

K2-8 c

Sub-Neptune · K-type orange

Radius 2.41 R⊕ · 1,316.1 ly

Kepler-1337 b

Sub-Neptune · K-type orange

Radius 2.41 R⊕ · 1,962.2 ly

K2-347 b

Sub-Neptune · K-type orange

Radius 2.41 R⊕ · 1,044.8 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries Kepler Mission K-type orange Hosts