Key parameters at a glance

A radius of 3.95 Earth radii
A mass of 14.80 Earth masses
Surface gravity around 0.95 g
An orbital period of 14.787 days
Semi-major axis 0.1184 AU
Equilibrium temperature 739 K (466 °C)
Distance from Earth 1,343.51 light-years
Earth Similarity Index 0.284
Travel time at Voyager 1 speed 23,692,825 years

K2-193 b Planet Profile

Physical Specs

Radius

3.95 R⊕

Radius (Jupiter)

0.352 R♃

Mass

14.80 M⊕

Mass (Jupiter)

0.047 M♃

Density

1.32 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.284

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

#9of 1978

top 0.4%

This planet

3.95R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-178 d 3.95 R⊕ Kepler-552 b 3.95 R⊕ Kepler-1719 b 3.95 R⊕

Metric	Earth	K2-193 b	Jupiter
Radius (R⊕)	1.00	3.95	11.21
Mass (M⊕)	1.00	14.80	317.83
Density (g/cm³)	5.51	1.32	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 741596

Gaia DR2

Gaia DR2 3616526878875985536

Gaia DR3

Gaia DR3 3616526878875985536

System

K2-193

Percentile among Sub-Neptune cohort

Radius 3.950 R⊕ · percentile 99 / cohort 1978

Mass 14.800 M⊕ · percentile 92 / cohort 1978

Orbital period 14.79 d · percentile 50 / cohort 1946

Distance 411.92 pc · percentile 42 / cohort 1975

ESI 0.284 · percentile 24 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.787 days

Semi-major axis

0.1184 AU

Eccentricity

—

Inclination

89.19 °

Year Length

A year here lasts approximately 14.79 Earth days (4.0% of a terrestrial year) at a mean orbital distance of 0.1184 AU.

Transit Fingerprint

Depth

0.169 %

Duration

4.320 h

Impact parameter b

0.290

Rp / R★

0.036900

Transit midpoint (BJD)

2,457,224.2612

Photometric dip

Transit produces a flux drop of 1,692 ppm lasting ≈ 4.32 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036900

Semi-major axis / stellar radius

26.080

Impact parameter (b)

0.290

Transit mid-time (BJD)

2,457,224.2612

Angular separation (arcsec)

0.28700

Eq. Temperature

739K

(466 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.284

0 = alien, 1 = Earth-identical

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

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: K2-193

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,817 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.980 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

1.532 g/cm³

Metallicity ratio

[Fe/H]

Distance

411.92 parsec

Light-years 1,343.51 ly

V-band magnitude

13.34 mag

Voyager-speed travel 23,692,825 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.399 mas

Total Proper Motion

13.623 mas/yr

PM Right Ascension

11.37 mas/yr

PM Declination

-7.50 mas/yr

Galactic Cartesian (pc)

x = -0.888 · y = -0.419 · z = -0.191

Equatorial (J2000)

RA 205.23710° · Dec -11.00933°

Galactic ℓ, b

322.046° · 50.016°

Ecliptic λ, β

207.381° · -0.500°

HTM-20 index

108468859