Key parameters at a glance

A radius of 2.51 Earth radii
A mass of 6.86 Earth masses
Surface gravity around 1.09 g
An orbital period of 5.172 days
Distance from Earth 622.34 light-years
Earth Similarity Index 0.702
Travel time at Voyager 1 speed 10,974,935 years
Almost certainly tidally locked to its host star given the close orbit

K2-179 b Planet Profile

Physical Specs

Radius

2.51 R⊕

Radius (Jupiter)

0.224 R♃

Mass

6.86 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.38 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.702

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

#1158of 1978

top 58.5%

This planet

2.51R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-263 b 2.51 R⊕ Kepler-24 c 2.51 R⊕ GJ 876 d 2.51 R⊕

Metric	Earth	K2-179 b	Jupiter
Radius (R⊕)	1.00	2.51	11.21
Mass (M⊕)	1.00	6.86	317.83
Density (g/cm³)	5.51	2.38	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 14078624

Gaia DR2

Gaia DR2 65797082206292224

Gaia DR3

Gaia DR3 65797082206292224

System

K2-179

Percentile among Sub-Neptune cohort

Radius 2.513 R⊕ · percentile 41 / cohort 1978

Mass 6.860 M⊕ · percentile 39 / cohort 1978

Orbital period 5.17 d · percentile 13 / cohort 1946

Distance 190.81 pc · percentile 28 / cohort 1975

ESI 0.702 · percentile 92 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.172 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.75 °

Year Length

A year here lasts approximately 5.17 Earth days (1.4% of a terrestrial year).

Transit Fingerprint

Depth

0.096 %

Duration

1.766 h

Rp / R★

0.029992

Transit midpoint (BJD)

2,457,066.5803

Photometric dip

Transit produces a flux drop of 964 ppm lasting ≈ 1.77 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.702

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Mayo et al. 2018

Instrument

Kepler CCD Array

Publication

2018-03

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: K2-179

Spectral Class

K-type orange

Effective Temperature

5,015 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.768 R☉

Stellar Mass

0.824 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.630 dex

Stellar density

3.350 g/cm³

Systemic radial velocity

-1.93 km/s

Metallicity ratio

[Fe/H]

Distance

190.81 parsec

Light-years 622.34 ly

V-band magnitude

12.94 mag

Voyager-speed travel 10,974,935 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

5.213 mas

Total Proper Motion

25.707 mas/yr

PM Right Ascension

-23.34 mas/yr

PM Declination

-10.77 mas/yr

Galactic Cartesian (pc)

x = 0.474 · y = 0.783 · z = 0.403

Equatorial (J2000)

RA 58.79679° · Dec 23.75675°

Galactic ℓ, b

168.323° · -22.507°

Ecliptic λ, β

61.638° · 3.337°

HTM-20 index

-285097745

Similar Worlds

Kepler-239 c

Sub-Neptune · K-type orange

Radius 2.51 R⊕ · 2,113.8 ly

Kepler-1350 b

Sub-Neptune · K-type orange

Radius 2.52 R⊕ · 1,111.2 ly

Kepler-1521 b

Sub-Neptune · K-type orange

Radius 2.50 R⊕ · 675.1 ly

TOI-757 b

Sub-Neptune · K-type orange

Radius 2.50 R⊕ · 196.8 ly

Kepler-391 b

Sub-Neptune · K-type orange

Radius 2.50 R⊕ · 2,835.1 ly

Kepler-298 d

Sub-Neptune · K-type orange

Radius 2.50 R⊕ · 1,690.2 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries K2 Mission K-type orange Hosts