Key parameters at a glance

A radius of 0.84 Earth radii
A mass of 8.25 Earth masses
Surface gravity around 11.69 g
An orbital period of 25.517 days
Semi-major axis 0.1739 AU
Equilibrium temperature 615 K (342 °C)
Distance from Earth 745.85 light-years
Earth Similarity Index 0.270
Travel time at Voyager 1 speed 13,153,011 years

1 sibling around Kepler-131

Kepler-131 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-131 b	Sub-Neptune	2.41	16.13	16.092	718	2014
Kepler-131 c this	Rocky Terrestrial	0.84	8.25	25.517	615	2014

Kepler-131 c Planet Profile

Physical Specs

Radius

0.84 R⊕

Radius (Jupiter)

0.075 R♃

Mass

8.25 M⊕

Mass (Jupiter)

0.026 M♃

Density

77.70 g/cm³

Surface Gravity

11.69 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.270

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#456of 570

top 79.8%

This planet

0.84R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1507 b 0.84 R⊕ Kepler-1579 b 0.84 R⊕ Kepler-450 d 0.84 R⊕

Metric	Earth	Kepler-131 c	Jupiter
Radius (R⊕)	1.00	0.84	11.21
Mass (M⊕)	1.00	8.25	317.83
Density (g/cm³)	5.51	77.70	1.33
Surface Gravity (g)	1.00	11.69	2.53
Insolation (S⊕)	1.00	35.74	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.250 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 121660708

Gaia DR2

Gaia DR2 2102110174677569664

Gaia DR3

Gaia DR3 2102110174677569664

System

Kepler-131

Percentile among Rocky Terrestrial cohort

Radius 0.840 R⊕ · percentile 20 / cohort 570

Mass 8.250 M⊕ · percentile 97 / cohort 570

Orbital period 25.52 d · percentile 95 / cohort 567

Distance 228.68 pc · percentile 33 / cohort 566

ESI 0.270 · percentile 29 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

25.517 days

Semi-major axis

0.1739 AU

Eccentricity

0.000

Inclination

89.53 °

Year Length

A year here lasts approximately 25.52 Earth days (7.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1739 AU.

Transit Fingerprint

Depth

0.006 %

Duration

5.141 h

Impact parameter b

0.270

Rp / R★

0.007394

Transit midpoint (BJD)

2,454,987.4234

Photometric dip

Transit produces a flux drop of 63 ppm lasting ≈ 5.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007394

Semi-major axis / stellar radius

33.900

Impact parameter (b)

0.270

RV semi-amplitude (K)

3.580 m/s

Transit mid-time (BJD)

2,454,987.4234

Angular separation (arcsec)

0.76100

Eq. Temperature

615K

(342 °C)

Insolation (S⊕)

35.74

Earth = 1.00

Earth Similarity (ESI)

0.270

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.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Marcy et al. 2014

Instrument

Kepler CCD Array

Publication

2014-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-131

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,685 K — cooler than the Sun (5,778 K)

Estimated Age

3.66 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

1.020 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.417 dex

Stellar density

1.440 g/cm³

Systemic radial velocity

-22.62 km/s

Rotational v·sin i

0.40 km/s

Metallicity ratio

[Fe/H]

Distance

228.68 parsec

Light-years 745.85 ly

V-band magnitude

11.49 mag

Voyager-speed travel 13,153,011 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

4.344 mas

Total Proper Motion

15.366 mas/yr

PM Right Ascension

6.36 mas/yr

PM Declination

13.99 mas/yr

Galactic Cartesian (pc)

x = 0.240 · y = -0.716 · z = 0.655

Equatorial (J2000)

RA 288.53089° · Dec 40.94237°

Galactic ℓ, b

72.324° · 13.437°

Ecliptic λ, β

301.193° · 62.389°

HTM-20 index

-1315564288