Key parameters at a glance

A radius of 2.20 Earth radii
A mass of 7.05 Earth masses
Surface gravity around 1.46 g
An orbital period of 12.816 days
Semi-major axis 0.1106 AU
Equilibrium temperature 939 K (666 °C)
Distance from Earth 993.62 light-years
Earth Similarity Index 0.252
Travel time at Voyager 1 speed 17,522,452 years

3 siblings around Kepler-100

Kepler-100 c shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-100 b	Super-Earth	1.34	4.01	6.887	1,155	2014
Kepler-100 c this	Sub-Neptune	2.20	7.05	12.816	939	2014
Kepler-100 d	Super-Earth	1.61	3.00	35.333	670	2014
Kepler-100 e	Neptune-like	5.27	24.14	60.889	—	2023

Kepler-100 c Planet Profile

Physical Specs

Radius

2.20 R⊕

Radius (Jupiter)

0.196 R♃

Mass

7.05 M⊕

Mass (Jupiter)

0.022 M♃

Density

1.72 g/cm³

Surface Gravity

1.46 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.252

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

#1673of 1978

top 84.5%

This planet

2.20R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 110067 b 2.20 R⊕ Kepler-169 e 2.20 R⊕ Kepler-122 d 2.20 R⊕

Metric	Earth	Kepler-100 c	Jupiter
Radius (R⊕)	1.00	2.20	11.21
Mass (M⊕)	1.00	7.05	317.83
Density (g/cm³)	5.51	1.72	1.33
Surface Gravity (g)	1.00	1.46	2.53
Insolation (S⊕)	1.00	208.66	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.050 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	4.002 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 159654016

Gaia DR2

Gaia DR2 2101733244046205568

Gaia DR3

Gaia DR3 2101733244046205568

System

Kepler-100

Percentile among Sub-Neptune cohort

Radius 2.200 R⊕ · percentile 15 / cohort 1978

Mass 7.050 M⊕ · percentile 41 / cohort 1978

Orbital period 12.82 d · percentile 44 / cohort 1946

Distance 304.65 pc · percentile 35 / cohort 1975

ESI 0.252 · percentile 16 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.816 days

Semi-major axis

0.1106 AU

Eccentricity

0.020

Inclination

87.40 °

Year Length

A year here lasts approximately 12.82 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1106 AU.

Transit Fingerprint

Depth

0.022 %

Duration

6.373 h

Impact parameter b

0.050

Rp / R★

0.013550

Transit midpoint (BJD)

2,454,955.9471

Photometric dip

Transit produces a flux drop of 218 ppm lasting ≈ 6.37 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013550

Semi-major axis / stellar radius

9.350

Impact parameter (b)

0.050

RV semi-amplitude (K)

1.028 m/s

Transit mid-time (BJD)

2,454,955.9471

Angular separation (arcsec)

0.36300

Eq. Temperature

939K

(666 °C)

Insolation (S⊕)

208.66

Earth = 1.00

Earth Similarity (ESI)

0.252

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.

Discovery Paper

Primary reference

Marcy et al. 2014

Instrument

Kepler CCD Array

Publication

2014-02

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-100

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,825 K — hotter than the Sun (5,778 K)

Estimated Age

6.46 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.490 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.125 dex

Stellar density

0.440 g/cm³

Systemic radial velocity

-60.44 km/s

Rotational v·sin i

3.70 km/s

Metallicity ratio

[Fe/H]

Distance

304.65 parsec

Light-years 993.62 ly

V-band magnitude

11.06 mag

Voyager-speed travel 17,522,452 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.254 mas

Total Proper Motion

34.787 mas/yr

PM Right Ascension

19.91 mas/yr

PM Declination

-28.53 mas/yr

Galactic Cartesian (pc)

x = 0.271 · y = -0.692 · z = 0.669

Equatorial (J2000)

RA 291.38613° · Dec 41.99014°

Galactic ℓ, b

74.228° · 11.945°

Ecliptic λ, β

306.304° · 62.759°

HTM-20 index

-383871624