Key parameters at a glance

A radius of 2.78 Earth radii
A mass of 35.50 Earth masses
Surface gravity around 4.59 g
An orbital period of 10.218 days
Semi-major axis 0.0929 AU
Equilibrium temperature 920 K (647 °C)
Distance from Earth 3,161.27 light-years
Earth Similarity Index 0.256
Travel time at Voyager 1 speed 55,749,056 years

3 siblings around Kepler-58

Kepler-58 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-58 e	Super-Earth	1.61	597.80	4.458	1,212	2023
Kepler-58 b this	Sub-Neptune	2.78	35.50	10.218	920	2012
Kepler-58 c	Sub-Neptune	2.86	53.00	15.574	799	2012
Kepler-58 d	Sub-Neptune	2.94	245.34	40.101	583	2014

Kepler-58 b Planet Profile

Physical Specs

Radius

2.78 R⊕

Radius (Jupiter)

0.248 R♃

Mass

35.50 M⊕

Mass (Jupiter)

0.112 M♃

Density

10.10 g/cm³

Surface Gravity

4.59 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.256

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#768of 1978

top 38.8%

This planet

2.78R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-531 b 2.78 R⊕ K2-284 b 2.78 R⊕ Kepler-894 b 2.78 R⊕

Metric	Earth	Kepler-58 b	Jupiter
Radius (R⊕)	1.00	2.78	11.21
Mass (M⊕)	1.00	35.50	317.83
Density (g/cm³)	5.51	10.10	1.33
Surface Gravity (g)	1.00	4.59	2.53
Insolation (S⊕)	1.00	112.99	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	35.500 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 184471242

Gaia DR2

Gaia DR2 2073274618947678464

Gaia DR3

Gaia DR3 2073274618947678464

System

Kepler-58

Percentile among Sub-Neptune cohort

Radius 2.780 R⊕ · percentile 61 / cohort 1978

Mass 35.500 M⊕ · percentile 97 / cohort 1978

Orbital period 10.22 d · percentile 35 / cohort 1946

Distance 969.25 pc · percentile 76 / cohort 1975

ESI 0.256 · percentile 18 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.218 days

Semi-major axis

0.0929 AU

Eccentricity

0.040

Inclination

88.76 °

Year Length

A year here lasts approximately 10.22 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0929 AU.

Transit Fingerprint

Depth

0.045 %

Duration

4.397 h

Impact parameter b

0.779

Rp / R★

0.024710

Transit midpoint (BJD)

2,454,969.8705

Photometric dip

Transit produces a flux drop of 445 ppm lasting ≈ 4.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024710

Semi-major axis / stellar radius

6.690

Impact parameter (b)

0.779

Transit mid-time (BJD)

2,454,969.8705

Angular separation (arcsec)

0.09590

Eq. Temperature

920K

(647 °C)

Insolation (S⊕)

112.99

Earth = 1.00

Earth Similarity (ESI)

0.256

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Steffen et al. 2013

Instrument

Kepler CCD Array

Publication

2013-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2012 at Kepler (12 shown).

Kepler-54 c · Rocky Terrestrial Kepler-49 c · Sub-Neptune Kepler-55 b · Sub-Neptune Kepler-49 b · Sub-Neptune Kepler-81 c · Sub-Neptune Kepler-55 c · Sub-Neptune Kepler-52 c · Super-Earth Kepler-83 c · Sub-Neptune Kepler-32 d · Sub-Neptune Kepler-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-80 c · Sub-Neptune

Host System: Kepler-58

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,843 K — hotter than the Sun (5,778 K)

Estimated Age

2.14 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.150 g/cm³

Metallicity ratio

[Fe/H]

Distance

969.25 parsec

Light-years 3,161.27 ly

V-band magnitude

15.09 mag

Voyager-speed travel 55,749,056 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.004 mas

Total Proper Motion

4.187 mas/yr

PM Right Ascension

-4.18 mas/yr

PM Declination

0.14 mas/yr

Galactic Cartesian (pc)

x = 0.344 · y = -0.695 · z = 0.631

Equatorial (J2000)

RA 296.35863° · Dec 39.11520°

Galactic ℓ, b

73.419° · 7.266°

Ecliptic λ, β

311.677° · 58.800°

HTM-20 index

-1154929470