Key parameters at a glance

A radius of 2.23 Earth radii
A mass of 5.60 Earth masses
Surface gravity around 1.13 g
An orbital period of 10.940 days
Semi-major axis 0.0952 AU
Equilibrium temperature 764 K (491 °C)
Distance from Earth 2,569.76 light-years
Earth Similarity Index 0.346
Travel time at Voyager 1 speed 45,317,778 years

Kepler-587 b Planet Profile

Physical Specs

Radius

2.23 R⊕

Radius (Jupiter)

0.199 R♃

Mass

5.60 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.77 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.346

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

#1622of 1978

top 82.0%

This planet

2.23R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-292 d 2.23 R⊕ Kepler-165 c 2.23 R⊕ Kepler-235 b 2.23 R⊕

Metric	Earth	Kepler-587 b	Jupiter
Radius (R⊕)	1.00	2.23	11.21
Mass (M⊕)	1.00	5.60	317.83
Density (g/cm³)	5.51	2.77	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	70.97	0.037

Star Catalogue Identifiers

TIC

TIC 158838923

Gaia DR2

Gaia DR2 2130815021663398144

Gaia DR3

Gaia DR3 2130815021663398144

System

Kepler-587

Percentile among Sub-Neptune cohort

Radius 2.230 R⊕ · percentile 17 / cohort 1978

Mass 5.600 M⊕ · percentile 17 / cohort 1978

Orbital period 10.94 d · percentile 38 / cohort 1946

Distance 787.89 pc · percentile 65 / cohort 1975

ESI 0.346 · percentile 40 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.940 days

Semi-major axis

0.0952 AU

Eccentricity

0.000

Inclination

88.85 °

Year Length

A year here lasts approximately 10.94 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0952 AU.

Transit Fingerprint

Depth

0.054 %

Duration

2.287 h

Impact parameter b

0.504

Rp / R★

0.022652

Transit midpoint (BJD)

2,455,003.3065

Photometric dip

Transit produces a flux drop of 539 ppm lasting ≈ 2.29 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022652

Semi-major axis / stellar radius

32.500

Impact parameter (b)

0.504

Transit mid-time (BJD)

2,455,003.3065

Angular separation (arcsec)

0.12100

Eq. Temperature

764K

(491 °C)

Insolation (S⊕)

70.97

Earth = 1.00

Earth Similarity (ESI)

0.346

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

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-587

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,549 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.890 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

5.436 g/cm³

Metallicity ratio

[Fe/H]

Distance

787.89 parsec

Light-years 2,569.76 ly

V-band magnitude

15.01 mag

Voyager-speed travel 45,317,778 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.241 mas

Total Proper Motion

5.484 mas/yr

PM Right Ascension

0.02 mas/yr

PM Declination

-5.48 mas/yr

Galactic Cartesian (pc)

x = 0.217 · y = -0.641 · z = 0.736

Equatorial (J2000)

RA 288.67066° · Dec 47.39912°

Galactic ℓ, b

78.478° · 15.941°

Ecliptic λ, β

306.244° · 68.501°

HTM-20 index

1671565351