Key parameters at a glance

A radius of 2.59 Earth radii
A mass of 7.22 Earth masses
Surface gravity around 1.08 g
An orbital period of 17.308 days
Semi-major axis 0.1310 AU
Equilibrium temperature 815 K (542 °C)
Distance from Earth 3,581.10 light-years
Earth Similarity Index 0.306
Travel time at Voyager 1 speed 63,152,607 years

2 siblings around Kepler-194

Kepler-194 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-194 b	Super-Earth	1.51	2.89	2.092	1,648	2014
Kepler-194 c this	Sub-Neptune	2.59	7.22	17.308	815	2014
Kepler-194 d	Sub-Neptune	2.40	6.35	52.815	562	2014

Kepler-194 c Planet Profile

Physical Specs

Radius

2.59 R⊕

Radius (Jupiter)

0.231 R♃

Mass

7.22 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.28 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.306

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1043of 1978

top 52.7%

This planet

2.59R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-285 b 2.59 R⊕ Kepler-265 e 2.59 R⊕ HD 109833 c 2.59 R⊕

Metric	Earth	Kepler-194 c	Jupiter
Radius (R⊕)	1.00	2.59	11.21
Mass (M⊕)	1.00	7.22	317.83
Density (g/cm³)	5.51	2.28	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	56.96	0.037

Star Catalogue Identifiers

TIC

TIC 63070427

Gaia DR2

Gaia DR2 2129234336259850240

Gaia DR3

Gaia DR3 2129234336259850240

System

Kepler-194

Percentile among Sub-Neptune cohort

Radius 2.590 R⊕ · percentile 47 / cohort 1978

Mass 7.220 M⊕ · percentile 43 / cohort 1978

Orbital period 17.31 d · percentile 57 / cohort 1946

Distance 1,097.97 pc · percentile 84 / cohort 1975

ESI 0.306 · percentile 30 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

17.308 days

Semi-major axis

0.1310 AU

Eccentricity

0.000

Inclination

90.00 °

Year Length

A year here lasts approximately 17.31 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1310 AU.

Transit Fingerprint

Depth

0.063 %

Duration

4.961 h

Impact parameter b

0.080

Rp / R★

0.023656

Transit midpoint (BJD)

2,455,009.9417

Photometric dip

Transit produces a flux drop of 633 ppm lasting ≈ 4.96 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023656

Semi-major axis / stellar radius

26.455

Impact parameter (b)

0.080

Transit mid-time (BJD)

2,455,009.9417

Angular separation (arcsec)

0.11900

Eq. Temperature

815K

(542 °C)

Insolation (S⊕)

56.96

Earth = 1.00

Earth Similarity (ESI)

0.306

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-194

Spectral Class

F-type yellow-white

Effective Temperature

6,089 K — hotter than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.025 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.415 dex

Stellar density

1.020 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,097.97 parsec

Light-years 3,581.10 ly

V-band magnitude

14.97 mag

Voyager-speed travel 63,152,607 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.882 mas

Total Proper Motion

25.300 mas/yr

PM Right Ascension

-7.30 mas/yr

PM Declination

-24.22 mas/yr

Galactic Cartesian (pc)

x = 0.251 · y = -0.622 · z = 0.742

Equatorial (J2000)

RA 291.97143° · Dec 47.86405°

Galactic ℓ, b

79.854° · 14.098°

Ecliptic λ, β

312.297° · 68.102°

HTM-20 index

-231707313