Key parameters at a glance

A radius of 1.41 Earth radii
A mass of 2.57 Earth masses
Surface gravity around 1.29 g
An orbital period of 4.939 days
Semi-major axis 0.0590 AU
Equilibrium temperature 1,244 K (971 °C)
Distance from Earth 3,727.96 light-years
Earth Similarity Index 0.239
Travel time at Voyager 1 speed 65,742,625 years

1 sibling around Kepler-187

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

Kepler-187 b Planet Profile

Physical Specs

Radius

1.41 R⊕

Radius (Jupiter)

0.126 R♃

Mass

2.57 M⊕

Mass (Jupiter)

0.008 M♃

Density

5.04 g/cm³

Surface Gravity

1.29 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.239

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

#902of 1176

top 76.6%

This planet

1.41R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-369 c 1.41 R⊕ Kepler-334 d 1.41 R⊕ Kepler-141 c 1.41 R⊕

Metric	Earth	Kepler-187 b	Jupiter
Radius (R⊕)	1.00	1.41	11.21
Mass (M⊕)	1.00	2.57	317.83
Density (g/cm³)	5.51	5.04	1.33
Surface Gravity (g)	1.00	1.29	2.53
Insolation (S⊕)	1.00	902.24	0.037

Star Catalogue Identifiers

TIC

TIC 269264648

Gaia DR2

Gaia DR2 2076107343163028992

Gaia DR3

Gaia DR3 2076107343163028992

System

Kepler-187

Percentile among Super-Earth cohort

Radius 1.410 R⊕ · percentile 22 / cohort 1176

Mass 2.570 M⊕ · percentile 21 / cohort 1176

Orbital period 4.94 d · percentile 40 / cohort 1164

Distance 1,143.00 pc · percentile 88 / cohort 1171

ESI 0.239 · percentile 21 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.939 days

Semi-major axis

0.0590 AU

Eccentricity

0.000

Inclination

84.67 °

Year Length

A year here lasts approximately 4.94 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0590 AU.

Transit Fingerprint

Depth

0.012 %

Duration

4.279 h

Impact parameter b

0.150

Rp / R★

0.010501

Transit midpoint (BJD)

2,454,968.9519

Photometric dip

Transit produces a flux drop of 124 ppm lasting ≈ 4.28 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010501

Semi-major axis / stellar radius

6.020

Impact parameter (b)

0.150

Transit mid-time (BJD)

2,454,968.9519

Angular separation (arcsec)

0.05160

Eq. Temperature

1,244K

(971 °C)

Insolation (S⊕)

902.24

Earth = 1.00

Earth Similarity (ESI)

0.239

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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