Key parameters at a glance

A radius of 1.28 Earth radii
A mass of 2.18 Earth masses
Surface gravity around 1.33 g
An orbital period of 5.903 days
Semi-major axis 0.0622 AU
Equilibrium temperature 948 K (675 °C)
Distance from Earth 643.50 light-years
Earth Similarity Index 0.328
Travel time at Voyager 1 speed 11,348,166 years

1 sibling around K2-158

K2-158 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
K2-158 c this	Super-Earth	1.28	2.18	5.903	948	2018
K2-158 b	Sub-Neptune	2.64	7.46	10.060	794	2018

K2-158 c Planet Profile

Physical Specs

Radius

1.28 R⊕

Radius (Jupiter)

0.114 R♃

Mass

2.18 M⊕

Mass (Jupiter)

0.007 M♃

Density

5.71 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.328

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1117of 1176

top 94.9%

This planet

1.28R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-776 b 1.28 R⊕ TOI-431 b 1.28 R⊕ TOI-270 b 1.28 R⊕

Metric	Earth	K2-158 c	Jupiter
Radius (R⊕)	1.00	1.28	11.21
Mass (M⊕)	1.00	2.18	317.83
Density (g/cm³)	5.51	5.71	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 35021200

Gaia DR2

Gaia DR2 3596003497911958528

Gaia DR3

Gaia DR3 3596003497911958528

System

K2-158

Percentile among Super-Earth cohort

Radius 1.280 R⊕ · percentile 4 / cohort 1176

Mass 2.180 M⊕ · percentile 5 / cohort 1176

Orbital period 5.90 d · percentile 46 / cohort 1164

Distance 197.30 pc · percentile 24 / cohort 1171

ESI 0.328 · percentile 44 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

5.903 days

Semi-major axis

0.0622 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 5.90 Earth days (1.6% of a terrestrial year) at a mean orbital distance of 0.0622 AU.

Transit Fingerprint

Depth

0.015 %

Duration

5.000 h

Impact parameter b

0.410

Rp / R★

0.012300

Transit midpoint (BJD)

2,457,583.8828

Photometric dip

Transit produces a flux drop of 150 ppm lasting ≈ 5.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012300

Semi-major axis / stellar radius

11.300

Impact parameter (b)

0.410

Transit mid-time (BJD)

2,457,583.8828

Angular separation (arcsec)

0.31500

Eq. Temperature

948K

(675 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.328

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Livingston et al. 2018

Instrument

Kepler CCD Array

Publication

2018-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-158

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,503 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.950 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

1.575 g/cm³

Systemic radial velocity

-36.00 km/s

Metallicity ratio

[Fe/H]

Distance

197.30 parsec

Light-years 643.50 ly

V-band magnitude

11.77 mag

Voyager-speed travel 11,348,166 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

5.040 mas

Total Proper Motion

62.859 mas/yr

PM Right Ascension

-62.52 mas/yr

PM Declination

6.56 mas/yr

Galactic Cartesian (pc)

x = -0.995 · y = 0.001 · z = -0.100

Equatorial (J2000)

RA 179.93971° · Dec -5.72169°

Galactic ℓ, b

280.198° · 54.853°

Ecliptic λ, β

182.223° · -5.272°

HTM-20 index

1076585824