Key parameters at a glance

A radius of 12.34 Earth radii
A mass of 584.78 Earth masses
Surface gravity around 3.84 g
An orbital period of 50.790 days
Semi-major axis 0.2804 AU
Equilibrium temperature 704 K (431 °C)
Distance from Earth 4,747.43 light-years
Earth Similarity Index 0.231
Travel time at Voyager 1 speed 83,720,904 years

1 sibling around Kepler-117

Kepler-117 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
Kepler-117 b	Neptune-like	8.06	29.88	18.796	984	2014
Kepler-117 c this	Gas Giant	12.34	584.78	50.790	704	2014

Kepler-117 c Planet Profile

Physical Specs

Radius

12.34 R⊕

Radius (Jupiter)

1.101 R♃

Mass

584.78 M⊕

Mass (Jupiter)

1.840 M♃

Density

1.74 g/cm³

Surface Gravity

3.84 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.231

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

#1340of 1771

top 75.6%

This planet

12.34R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-4961 b 12.34 R⊕ TOI-1842 b 12.35 R⊕ Kepler-730 b 12.33 R⊕

Metric	Earth	Kepler-117 c	Jupiter
Radius (R⊕)	1.00	12.34	11.21
Mass (M⊕)	1.00	584.78	317.83
Density (g/cm³)	5.51	1.74	1.33
Surface Gravity (g)	1.00	3.84	2.53
Insolation (S⊕)	1.00	41.86	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	584.780 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 299032847

Gaia DR2

Gaia DR2 2130959744881558272

Gaia DR3

Gaia DR3 2130959744881558272

System

Kepler-117

Percentile among Gas Giant cohort

Radius 12.341 R⊕ · percentile 24 / cohort 1771

Mass 584.780 M⊕ · percentile 52 / cohort 1747

Orbital period 50.79 d · percentile 50 / cohort 1533

Distance 1,455.57 pc · percentile 89 / cohort 1759

ESI 0.231 · percentile 42 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

50.790 days

Semi-major axis

0.2804 AU

Eccentricity

0.032

Inclination

89.64 °

Year Length

A year here lasts approximately 50.79 Earth days (13.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2804 AU.

Transit Fingerprint

Depth

0.567 %

Duration

10.883 h

Impact parameter b

0.268

Rp / R★

0.070520

Transit midpoint (BJD)

2,454,968.6321

Photometric dip

Transit produces a flux drop of 5,671 ppm lasting ≈ 10.88 h.

Extended Orbital Architecture

Planet / star radius ratio

0.070520

Semi-major axis / stellar radius

38.180

Impact parameter (b)

0.268

RV semi-amplitude (K)

90.400 m/s

Transit mid-time (BJD)

2,454,968.6321

Long. of periastron (ω)

305.00°

Angular separation (arcsec)

0.19300

Eq. Temperature

704K

(431 °C)

Insolation (S⊕)

41.86

Earth = 1.00

Earth Similarity (ESI)

0.231

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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-117

Spectral Class

F-type yellow-white

Effective Temperature

6,150 K — hotter than the Sun (5,778 K)

Estimated Age

5.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.606 R☉

Stellar Mass

1.129 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.102 dex

Stellar density

0.410 g/cm³

Systemic radial velocity

-12.95 km/s

Rotational v·sin i

6.00 km/s

Metallicity ratio

[Fe/H]

Distance

1,455.57 parsec

Light-years 4,747.43 ly

V-band magnitude

14.28 mag

Voyager-speed travel 83,720,904 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.658 mas

Total Proper Motion

10.403 mas/yr

PM Right Ascension

3.52 mas/yr

PM Declination

-9.79 mas/yr

Galactic Cartesian (pc)

x = 0.215 · y = -0.633 · z = 0.744

Equatorial (J2000)

RA 288.79307° · Dec 48.04018°

Galactic ℓ, b

79.125° · 16.115°

Ecliptic λ, β

307.083° · 69.072°

HTM-20 index

283749976