Key parameters at a glance

A radius of 1.12 Earth radii
A mass of 1.45 Earth masses
Surface gravity around 1.16 g
An orbital period of 3.525 days
Semi-major axis 0.0426 AU
Equilibrium temperature 1,098 K (825 °C)
Distance from Earth 1,998.69 light-years
Earth Similarity Index 0.287
Travel time at Voyager 1 speed 35,246,962 years

1 sibling around Kepler-589

Kepler-589 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-589 c this	Rocky Terrestrial	1.12	1.45	3.525	1,098	2021
Kepler-589 b	Sub-Neptune	2.27	5.77	16.550	656	2016

Kepler-589 c Planet Profile

Physical Specs

Radius

1.12 R⊕

Radius (Jupiter)

0.100 R♃

Mass

1.45 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.71 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.287

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#206of 570

top 36.0%

This planet

1.12R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TRAPPIST-1 b 1.12 R⊕ Kepler-1695 b 1.12 R⊕ Kepler-1869 b 1.12 R⊕

Metric	Earth	Kepler-589 c	Jupiter
Radius (R⊕)	1.00	1.12	11.21
Mass (M⊕)	1.00	1.45	317.83
Density (g/cm³)	5.51	5.71	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	344.61	0.037

Star Catalogue Identifiers

TIC

TIC 123129910

Gaia DR2

Gaia DR2 2119809116425132160

Gaia DR3

Gaia DR3 2119809116425132160

System

Kepler-589

Percentile among Rocky Terrestrial cohort

Radius 1.117 R⊕ · percentile 64 / cohort 570

Mass 1.450 M⊕ · percentile 59 / cohort 570

Orbital period 3.52 d · percentile 39 / cohort 567

Distance 612.80 pc · percentile 74 / cohort 566

ESI 0.287 · percentile 35 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

3.525 days

Semi-major axis

0.0426 AU

Eccentricity

0.000

Inclination

71.95 °

Year Length

A year here lasts approximately 3.52 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0426 AU.

Transit Fingerprint

Depth

0.013 %

Duration

2.484 h

Impact parameter b

0.070

Rp / R★

0.010979

Transit midpoint (BJD)

2,454,964.6401

Photometric dip

Transit produces a flux drop of 130 ppm lasting ≈ 2.48 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010979

Semi-major axis / stellar radius

13.180

Impact parameter (b)

0.070

Transit mid-time (BJD)

2,454,964.6401

Angular separation (arcsec)

0.06950

Eq. Temperature

1,098K

(825 °C)

Insolation (S⊕)

344.61

Earth = 1.00

Earth Similarity (ESI)

0.287

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-589

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,372 K — cooler than the Sun (5,778 K)

Estimated Age

14.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.916 R☉

Stellar Mass

0.832 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.434 dex

Stellar density

0.048 g/cm³

Systemic radial velocity

-18.91 km/s

Rotational v·sin i

3.90 km/s

Metallicity ratio

[Fe/H]

Distance

612.80 parsec

Light-years 1,998.69 ly

V-band magnitude

14.78 mag

Voyager-speed travel 35,246,962 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.603 mas

Total Proper Motion

26.804 mas/yr

PM Right Ascension

8.22 mas/yr

PM Declination

25.51 mas/yr

Galactic Cartesian (pc)

x = 0.124 · y = -0.661 · z = 0.740

Equatorial (J2000)

RA 280.64143° · Dec 47.75206°

Galactic ℓ, b

76.850° · 21.143°

Ecliptic λ, β

291.708° · 70.390°

HTM-20 index

1274122746