Key parameters at a glance

A radius of 2.67 Earth radii
A mass of 7.61 Earth masses
Surface gravity around 1.07 g
An orbital period of 10.640 days
Semi-major axis 0.0990 AU
Equilibrium temperature 963 K (690 °C)
Distance from Earth 3,727.96 light-years
Earth Similarity Index 0.254
Travel time at Voyager 1 speed 65,742,625 years

1 sibling around Kepler-187

Kepler-187 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-187 b	Super-Earth	1.41	2.57	4.939	1,244	2014
Kepler-187 c this	Sub-Neptune	2.67	7.61	10.640	963	2014

Kepler-187 c Planet Profile

Physical Specs

Radius

2.67 R⊕

Radius (Jupiter)

0.238 R♃

Mass

7.61 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.20 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.254

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

#904of 1978

top 45.7%

This planet

2.67R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-357 c 2.67 R⊕ Kepler-96 b 2.67 R⊕ K2-26 b 2.67 R⊕

Metric	Earth	Kepler-187 c	Jupiter
Radius (R⊕)	1.00	2.67	11.21
Mass (M⊕)	1.00	7.61	317.83
Density (g/cm³)	5.51	2.20	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	324.13	0.037

Star Catalogue Identifiers

TIC

TIC 269264648

Gaia DR2

Gaia DR2 2076107343163028992

Gaia DR3

Gaia DR3 2076107343163028992

System

Kepler-187

Percentile among Sub-Neptune cohort

Radius 2.670 R⊕ · percentile 53 / cohort 1978

Mass 7.610 M⊕ · percentile 49 / cohort 1978

Orbital period 10.64 d · percentile 36 / cohort 1946

Distance 1,143.00 pc · percentile 85 / cohort 1975

ESI 0.254 · percentile 17 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.640 days

Semi-major axis

0.0990 AU

Eccentricity

0.000

Inclination

85.61 °

Year Length

A year here lasts approximately 10.64 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0990 AU.

Transit Fingerprint

Depth

0.046 %

Duration

5.284 h

Impact parameter b

0.090

Rp / R★

0.021350

Transit midpoint (BJD)

2,455,012.7739

Photometric dip

Transit produces a flux drop of 455 ppm lasting ≈ 5.28 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021350

Semi-major axis / stellar radius

10.030

Impact parameter (b)

0.090

Transit mid-time (BJD)

2,455,012.7739

Angular separation (arcsec)

0.08660

Eq. Temperature

963K

(690 °C)

Insolation (S⊕)

324.13

Earth = 1.00

Earth Similarity (ESI)

0.254

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

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-187

Spectral Class

F-type yellow-white

Effective Temperature

6,105 K — hotter than the Sun (5,778 K)

Estimated Age

6.46 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.287 R☉

Stellar Mass

1.081 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.274 dex

Stellar density

0.310 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,143.00 parsec

Light-years 3,727.96 ly

V-band magnitude

14.30 mag

Voyager-speed travel 65,742,625 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.847 mas

Total Proper Motion

14.413 mas/yr

PM Right Ascension

3.64 mas/yr

PM Declination

-13.95 mas/yr

Galactic Cartesian (pc)

x = 0.357 · y = -0.623 · z = 0.696

Equatorial (J2000)

RA 299.79650° · Dec 44.08924°

Galactic ℓ, b

79.058° · 7.530°

Ecliptic λ, β

320.412° · 62.412°

HTM-20 index

-1715958873