Key parameters at a glance

A radius of 4.42 Earth radii
A mass of 26.40 Earth masses
Surface gravity around 1.35 g
An orbital period of 7.834 days
Semi-major axis 0.0739 AU
Equilibrium temperature 838 K (565 °C)
Distance from Earth 501.22 light-years
Earth Similarity Index 0.253
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 c 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 this	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 c Planet Profile

Physical Specs

Radius

4.42 R⊕

Radius (Jupiter)

0.394 R♃

Mass

26.40 M⊕

Mass (Jupiter)

0.083 M♃

Density

1.70 g/cm³

Surface Gravity

1.35 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.253

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#471of 574

top 81.9%

This planet

4.42R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

OGLE-2015-BLG-1670L b 4.42 R⊕ Kepler-550 b 4.42 R⊕ HD 99492 c 4.42 R⊕

Metric	Earth	Kepler-411 c	Jupiter
Radius (R⊕)	1.00	4.42	11.21
Mass (M⊕)	1.00	26.40	317.83
Density (g/cm³)	5.51	1.70	1.33
Surface Gravity (g)	1.00	1.35	2.53
Insolation (S⊕)	1.00	56.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	26.400 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 Neptune-like cohort

Radius 4.421 R⊕ · percentile 18 / cohort 574

Mass 26.400 M⊕ · percentile 44 / cohort 574

Orbital period 7.83 d · percentile 30 / cohort 524

Distance 153.68 pc · percentile 33 / cohort 572

ESI 0.253 · percentile 41 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

7.834 days

Semi-major axis

0.0739 AU

Eccentricity

0.108

Inclination

88.61 °

Year Length

A year here lasts approximately 7.83 Earth days (2.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0739 AU.

Transit Fingerprint

Depth

0.202 %

Duration

2.786 h

Impact parameter b

0.620

Rp / R★

0.044900

Transit midpoint (BJD)

2,454,968.2224

Photometric dip

Transit produces a flux drop of 2,018 ppm lasting ≈ 2.79 h.

Extended Orbital Architecture

Planet / star radius ratio

0.044900

Semi-major axis / stellar radius

22.210

Impact parameter (b)

0.620

Transit mid-time (BJD)

2,454,968.2224

Long. of periastron (ω)

103.00°

Angular separation (arcsec)

0.48100

Eq. Temperature

838K

(565 °C)

Insolation (S⊕)

56.00

Earth = 1.00

Earth Similarity (ESI)

0.253

0 = alien, 1 = Earth-identical

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

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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

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

HD 99492 c

Neptune-like · K-type orange

Radius 4.42 R⊕ · 59.4 ly

K2-55 b

Neptune-like · K-type orange

Radius 4.43 R⊕ · 520.3 ly

HD 69830 d

Neptune-like · K-type orange

Radius 4.45 R⊕ · 41.0 ly

HD 153557 c

Neptune-like · K-type orange

Radius 4.36 R⊕ · 58.5 ly

HAT-P-11 b

Neptune-like · K-type orange

Radius 4.36 R⊕ · 123.2 ly

Kepler-413 b

Neptune-like · K-type orange

Radius 4.35 R⊕ · 2,764.3 ly

Explore Related Categories

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