Key parameters at a glance

A radius of 0.68 Earth radii
A mass of 0.24 Earth masses
Surface gravity around 0.53 g
An orbital period of 3.505 days
Semi-major axis 0.0428 AU
Equilibrium temperature 1,019 K (746 °C)
Distance from Earth 1,062.41 light-years
Earth Similarity Index 0.284
Travel time at Voyager 1 speed 18,735,613 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1558 b Planet Profile

Physical Specs

Radius

0.68 R⊕

Radius (Jupiter)

0.061 R♃

Mass

0.24 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.26 g/cm³

Surface Gravity

0.53 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.284

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

#536of 570

top 93.9%

This planet

0.68R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

LHS 1678 b 0.69 R⊕ Kepler-141 b 0.69 R⊕ K2-116 b 0.69 R⊕

Metric	Earth	Kepler-1558 b	Jupiter
Radius (R⊕)	1.00	0.68	11.21
Mass (M⊕)	1.00	0.24	317.83
Density (g/cm³)	5.51	4.26	1.33
Surface Gravity (g)	1.00	0.53	2.53
Insolation (S⊕)	1.00	189.89	0.037

Star Catalogue Identifiers

TIC

TIC 158322085

Gaia DR2

Gaia DR2 2130633430445267584

Gaia DR3

Gaia DR3 2130633430445267584

System

Kepler-1558

Percentile among Rocky Terrestrial cohort

Radius 0.680 R⊕ · percentile 6 / cohort 570

Mass 0.244 M⊕ · percentile 5 / cohort 570

Orbital period 3.50 d · percentile 38 / cohort 567

Distance 325.74 pc · percentile 43 / cohort 566

ESI 0.284 · percentile 34 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

3.505 days

Semi-major axis

0.0428 AU

Eccentricity

0.000

Inclination

88.66 °

Year Length

A year here lasts approximately 3.50 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0428 AU.

Transit Fingerprint

Depth

0.009 %

Duration

2.010 h

Impact parameter b

0.005

Rp / R★

0.008445

Transit midpoint (BJD)

2,454,966.7249

Photometric dip

Transit produces a flux drop of 91 ppm lasting ≈ 2.01 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008445

Semi-major axis / stellar radius

13.440

Impact parameter (b)

0.005

Transit mid-time (BJD)

2,454,966.7249

Angular separation (arcsec)

0.13100

Eq. Temperature

1,019K

(746 °C)

Insolation (S⊕)

189.89

Earth = 1.00

Earth Similarity (ESI)

0.284

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

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-1558

Spectral Class

K-type orange

Effective Temperature

5,101 K — cooler than the Sun (5,778 K)

Estimated Age

4.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.790 R☉

Stellar Mass

0.830 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.570 dex

Stellar density

1.930 g/cm³

Metallicity ratio

[Fe/H]

Distance

325.74 parsec

Light-years 1,062.41 ly

V-band magnitude

13.81 mag

Voyager-speed travel 18,735,613 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.041 mas

Total Proper Motion

16.811 mas/yr

PM Right Ascension

9.07 mas/yr

PM Declination

14.16 mas/yr

Galactic Cartesian (pc)

x = 0.198 · y = -0.654 · z = 0.730

Equatorial (J2000)

RA 286.81943° · Dec 46.91178°

Galactic ℓ, b

77.508° · 16.919°

Ecliptic λ, β

302.566° · 68.458°

HTM-20 index

-1789752044