Key parameters at a glance

A radius of 3.25 Earth radii
A mass of 10.60 Earth masses
Surface gravity around 1.00 g
An orbital period of 17.355 days
Distance from Earth 1,225.27 light-years
Earth Similarity Index 0.612
Travel time at Voyager 1 speed 21,607,640 years

K2-164 b Planet Profile

Physical Specs

Radius

3.25 R⊕

Radius (Jupiter)

0.290 R♃

Mass

10.60 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.70 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.612

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

#319of 1978

top 16.1%

This planet

3.25R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 20781 d 3.25 R⊕ GJ 163 b 3.25 R⊕ Kepler-199 c 3.25 R⊕

Metric	Earth	K2-164 b	Jupiter
Radius (R⊕)	1.00	3.25	11.21
Mass (M⊕)	1.00	10.60	317.83
Density (g/cm³)	5.51	1.70	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 173090902

Gaia DR2

Gaia DR2 3797456808626205696

Gaia DR3

Gaia DR3 3797456808626205696

System

K2-164

Percentile among Sub-Neptune cohort

Radius 3.249 R⊕ · percentile 84 / cohort 1978

Mass 10.600 M⊕ · percentile 77 / cohort 1978

Orbital period 17.36 d · percentile 57 / cohort 1946

Distance 375.67 pc · percentile 39 / cohort 1975

ESI 0.612 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

17.355 days

Semi-major axis

— AU

Eccentricity

—

Inclination

87.89 °

Year Length

A year here lasts approximately 17.36 Earth days (4.8% of a terrestrial year).

Transit Fingerprint

Depth

0.021 %

Duration

9.168 h

Impact parameter b

0.140

Rp / R★

0.013565

Transit midpoint (BJD)

2,456,816.7370

Photometric dip

Transit produces a flux drop of 211 ppm lasting ≈ 9.17 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013565

Semi-major axis / stellar radius

13.912

Impact parameter (b)

0.140

Transit mid-time (BJD)

2,456,816.7370

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.612

0 = alien, 1 = Earth-identical

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: K2-164

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,791 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.196 R☉

Stellar Mass

1.181 M☉

Metallicity [Fe/H]

-0.23

Extended Stellar Properties

Surface gravity (log g)

3.810 dex

Stellar density

0.228 g/cm³

Systemic radial velocity

-21.23 km/s

Metallicity ratio

[Fe/H]

Distance

375.67 parsec

Light-years 1,225.27 ly

V-band magnitude

11.35 mag

Voyager-speed travel 21,607,640 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.634 mas

Total Proper Motion

1.854 mas/yr

PM Right Ascension

-1.64 mas/yr

PM Declination

0.86 mas/yr

Galactic Cartesian (pc)

x = -0.990 · y = 0.140 · z = -0.001

Equatorial (J2000)

RA 171.93366° · Dec -0.06285°

Galactic ℓ, b

263.014° · 56.180°

Ecliptic λ, β

172.613° · -3.257°

HTM-20 index

-1823584472