Key parameters at a glance

A radius of 2.63 Earth radii
A mass of 7.41 Earth masses
Surface gravity around 1.07 g
An orbital period of 4.222 days
Semi-major axis 0.0520 AU
Equilibrium temperature 1,176 K (903 °C)
Distance from Earth 3,944.53 light-years
Earth Similarity Index 0.205
Travel time at Voyager 1 speed 69,561,794 years

Kepler-588 b Planet Profile

Physical Specs

Radius

2.63 R⊕

Radius (Jupiter)

0.235 R♃

Mass

7.41 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.24 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.205

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

#969of 1978

top 48.9%

This planet

2.63R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1241 b 2.63 R⊕ GJ 3473 c 2.63 R⊕ Kepler-319 c 2.63 R⊕

Metric	Earth	Kepler-588 b	Jupiter
Radius (R⊕)	1.00	2.63	11.21
Mass (M⊕)	1.00	7.41	317.83
Density (g/cm³)	5.51	2.24	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	718.08	0.037

Star Catalogue Identifiers

TIC

TIC 164723136

Gaia DR2

Gaia DR2 2131621272922307968

Gaia DR3

Gaia DR3 2131621272922307968

System

Kepler-588

Percentile among Sub-Neptune cohort

Radius 2.630 R⊕ · percentile 50 / cohort 1978

Mass 7.410 M⊕ · percentile 46 / cohort 1978

Orbital period 4.22 d · percentile 9 / cohort 1946

Distance 1,209.40 pc · percentile 87 / cohort 1975

ESI 0.205 · percentile 7 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.222 days

Semi-major axis

0.0520 AU

Eccentricity

0.000

Inclination

82.12 °

Year Length

A year here lasts approximately 4.22 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0520 AU.

Transit Fingerprint

Depth

0.066 %

Duration

2.896 h

Impact parameter b

0.720

Rp / R★

0.024027

Transit midpoint (BJD)

2,455,006.6999

Photometric dip

Transit produces a flux drop of 658 ppm lasting ≈ 2.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024027

Semi-major axis / stellar radius

11.415

Impact parameter (b)

0.720

Transit mid-time (BJD)

2,455,006.6999

Angular separation (arcsec)

0.04300

Eq. Temperature

1,176K

(903 °C)

Insolation (S⊕)

718.08

Earth = 1.00

Earth Similarity (ESI)

0.205

0 = alien, 1 = Earth-identical

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

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-588

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,835 K — hotter than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.000 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

1.579 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,209.40 parsec

Light-years 3,944.53 ly

V-band magnitude

14.80 mag

Voyager-speed travel 69,561,794 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.798 mas

Total Proper Motion

11.681 mas/yr

PM Right Ascension

3.14 mas/yr

PM Declination

-11.25 mas/yr

Galactic Cartesian (pc)

x = 0.166 · y = -0.652 · z = 0.740

Equatorial (J2000)

RA 284.25725° · Dec 47.68891°

Galactic ℓ, b

77.619° · 18.819°

Ecliptic λ, β

298.567° · 69.718°

HTM-20 index

-917608904