Key parameters at a glance

A radius of 2.18 Earth radii
A mass of 5.39 Earth masses
Surface gravity around 1.13 g
An orbital period of 13.646 days
Semi-major axis 0.1089 AU
Equilibrium temperature 678 K (405 °C)
Distance from Earth 2,508.79 light-years
Earth Similarity Index 0.393
Travel time at Voyager 1 speed 44,242,544 years

Kepler-594 b Planet Profile

Physical Specs

Radius

2.18 R⊕

Radius (Jupiter)

0.194 R♃

Mass

5.39 M⊕

Mass (Jupiter)

0.017 M♃

Density

2.86 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.393

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

#1703of 1978

top 86.0%

This planet

2.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 3090 b 2.18 R⊕ Kepler-261 b 2.18 R⊕ Kepler-250 d 2.18 R⊕

Metric	Earth	Kepler-594 b	Jupiter
Radius (R⊕)	1.00	2.18	11.21
Mass (M⊕)	1.00	5.39	317.83
Density (g/cm³)	5.51	2.86	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	59.40	0.037

Star Catalogue Identifiers

TIC

TIC 299087968

Gaia DR2

Gaia DR2 2132681339572129536

Gaia DR3

Gaia DR3 2132681339572129536

System

Kepler-594

Percentile among Sub-Neptune cohort

Radius 2.180 R⊕ · percentile 13 / cohort 1978

Mass 5.390 M⊕ · percentile 14 / cohort 1978

Orbital period 13.65 d · percentile 46 / cohort 1946

Distance 769.20 pc · percentile 63 / cohort 1975

ESI 0.393 · percentile 51 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.646 days

Semi-major axis

0.1089 AU

Eccentricity

0.000

Inclination

89.79 °

Year Length

A year here lasts approximately 13.65 Earth days (3.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1089 AU.

Transit Fingerprint

Depth

0.063 %

Duration

3.374 h

Impact parameter b

0.910

Rp / R★

0.023335

Transit midpoint (BJD)

2,455,013.3482

Photometric dip

Transit produces a flux drop of 633 ppm lasting ≈ 3.37 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023335

Semi-major axis / stellar radius

31.570

Impact parameter (b)

0.910

Transit mid-time (BJD)

2,455,013.3482

Angular separation (arcsec)

0.14200

Eq. Temperature

678K

(405 °C)

Insolation (S⊕)

59.40

Earth = 1.00

Earth Similarity (ESI)

0.393

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-594

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,485 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.870 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

3.049 g/cm³

Metallicity ratio

[Fe/H]

Distance

769.20 parsec

Light-years 2,508.79 ly

V-band magnitude

14.91 mag

Voyager-speed travel 44,242,544 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.271 mas

Total Proper Motion

17.370 mas/yr

PM Right Ascension

16.83 mas/yr

PM Declination

-4.32 mas/yr

Galactic Cartesian (pc)

x = 0.209 · y = -0.611 · z = 0.763

Equatorial (J2000)

RA 288.92173° · Dec 49.76202°

Galactic ℓ, b

80.816° · 16.701°

Ecliptic λ, β

309.180° · 70.638°

HTM-20 index

620026101