Key parameters at a glance

A radius of 7.08 Earth radii
A mass of 222.48 Earth masses
Surface gravity around 4.43 g
An orbital period of 224.778 days
Semi-major axis 0.7510 AU
Equilibrium temperature 352 K (79 °C)
Distance from Earth 2,143.57 light-years
Earth Similarity Index 0.534
Travel time at Voyager 1 speed 37,801,894 years

1 sibling around Kepler-111

Kepler-111 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-111 b	Super-Earth	1.58	3.12	3.342	1,356	2014
Kepler-111 c this	Neptune-like	7.08	222.48	224.778	352	2014

Kepler-111 c Planet Profile

Physical Specs

Radius

7.08 R⊕

Radius (Jupiter)

0.632 R♃

Mass

222.48 M⊕

Mass (Jupiter)

0.700 M♃

Density

3.42 g/cm³

Surface Gravity

4.43 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.534

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

#196of 574

top 34.0%

This planet

7.08R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-51 b 7.10 R⊕ HAT-P-26 b 7.06 R⊕ WASP-166 b 7.06 R⊕

Metric	Earth	Kepler-111 c	Jupiter
Radius (R⊕)	1.00	7.08	11.21
Mass (M⊕)	1.00	222.48	317.83
Density (g/cm³)	5.51	3.42	1.33
Surface Gravity (g)	1.00	4.43	2.53
Insolation (S⊕)	1.00	2.48	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	222.480 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 63001143

Gaia DR2

Gaia DR2 2126569051355142656

Gaia DR3

Gaia DR3 2126569051355142656

System

Kepler-111

Percentile among Neptune-like cohort

Radius 7.084 R⊕ · percentile 66 / cohort 574

Mass 222.480 M⊕ · percentile 95 / cohort 574

Orbital period 224.78 d · percentile 90 / cohort 524

Distance 657.22 pc · percentile 63 / cohort 572

ESI 0.534 · percentile 97 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

224.778 days

Semi-major axis

0.7510 AU

Eccentricity

0.176

Inclination

89.76 °

Year Length

A year here lasts approximately 224.78 Earth days (61.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.7510 AU.

Transit Fingerprint

Depth

0.323 %

Duration

11.130 h

Impact parameter b

0.650

Rp / R★

0.056800

Transit midpoint (BJD)

2,454,975.0961

Photometric dip

Transit produces a flux drop of 3,226 ppm lasting ≈ 11.13 h.

Extended Orbital Architecture

Planet / star radius ratio

0.056800

Semi-major axis / stellar radius

141.000

Impact parameter (b)

0.650

RV semi-amplitude (K)

22.200 m/s

Transit mid-time (BJD)

2,454,975.0961

Long. of periastron (ω)

-141.00°

Angular separation (arcsec)

1.14000

Eq. Temperature

352K

(79 °C)

Insolation (S⊕)

2.48

Earth = 1.00

Earth Similarity (ESI)

0.534

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-111

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,914 K — hotter than the Sun (5,778 K)

Estimated Age

3.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.145 R☉

Stellar Mass

1.118 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.369 dex

Stellar density

1.050 g/cm³

Metallicity ratio

[Fe/H]

Distance

657.22 parsec

Light-years 2,143.57 ly

V-band magnitude

13.54 mag

Voyager-speed travel 37,801,894 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.493 mas

Total Proper Motion

3.827 mas/yr

PM Right Ascension

-1.14 mas/yr

PM Declination

-3.65 mas/yr

Galactic Cartesian (pc)

x = 0.262 · y = -0.661 · z = 0.703

Equatorial (J2000)

RA 291.65316° · Dec 44.68826°

Galactic ℓ, b

76.803° · 12.941°

Ecliptic λ, β

308.775° · 65.239°

HTM-20 index

597305021