Key parameters at a glance

A radius of 2.53 Earth radii
A mass of 3.90 Earth masses
Surface gravity around 0.61 g
An orbital period of 11.776 days
Semi-major axis 0.0836 AU
Equilibrium temperature 446 K (173 °C)
Distance from Earth 846.48 light-years
Earth Similarity Index 0.324
Travel time at Voyager 1 speed 14,927,717 years
Almost certainly tidally locked to its host star given the close orbit

2 siblings around Kepler-114

Kepler-114 d 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-114 b	Super-Earth	1.26	1.09	5.189	586	2014
Kepler-114 c	Super-Earth	1.60	2.80	8.041	507	2013
Kepler-114 d this	Sub-Neptune	2.53	3.90	11.776	446	2013

Kepler-114 d Planet Profile

Physical Specs

Radius

2.53 R⊕

Radius (Jupiter)

0.226 R♃

Mass

3.90 M⊕

Mass (Jupiter)

0.012 M♃

Density

0.22 g/cm³

Surface Gravity

0.61 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.324

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1133of 1978

top 57.2%

This planet

2.53R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-896 b 2.53 R⊕ Kepler-313 b 2.53 R⊕ TOI-1136 g 2.53 R⊕

Metric	Earth	Kepler-114 d	Jupiter
Radius (R⊕)	1.00	2.53	11.21
Mass (M⊕)	1.00	3.90	317.83
Density (g/cm³)	5.51	0.22	1.33
Surface Gravity (g)	1.00	0.61	2.53
Insolation (S⊕)	1.00	31.02	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 27011135

Gaia DR2

Gaia DR2 2128939873302216320

Gaia DR3

Gaia DR3 2128939873302216320

System

Kepler-114

Percentile among Sub-Neptune cohort

Radius 2.530 R⊕ · percentile 42 / cohort 1978

Mass 3.900 M⊕ · percentile 1 / cohort 1978

Orbital period 11.78 d · percentile 41 / cohort 1946

Distance 259.53 pc · percentile 32 / cohort 1975

ESI 0.324 · percentile 34 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.776 days

Semi-major axis

0.0836 AU

Eccentricity

0.000

Inclination

88.87 °

Year Length

A year here lasts approximately 11.78 Earth days (3.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0836 AU.

Transit Fingerprint

Depth

0.143 %

Duration

2.902 h

Impact parameter b

0.690

Rp / R★

0.033000

Transit midpoint (BJD)

2,454,975.7057

Photometric dip

Transit produces a flux drop of 1,429 ppm lasting ≈ 2.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033000

Semi-major axis / stellar radius

24.000

Impact parameter (b)

0.690

Transit mid-time (BJD)

2,454,975.7057

Angular separation (arcsec)

0.32200

Eq. Temperature

446K

(173 °C)

Insolation (S⊕)

31.02

Earth = 1.00

Earth Similarity (ESI)

0.324

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

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

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Xie 2014

Instrument

Kepler CCD Array

Publication

2014-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: Kepler-114

Spectral Class

M-type red dwarf

Effective Temperature

4,660 K — cooler than the Sun (5,778 K)

Estimated Age

2.69 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.540 R☉

Stellar Mass

0.560 M☉

Metallicity [Fe/H]

0.23

Extended Stellar Properties

Surface gravity (log g)

4.720 dex

Stellar density

3.413 g/cm³

Metallicity ratio

[M/H]

Distance

259.53 parsec

Light-years 846.48 ly

V-band magnitude

13.96 mag

Voyager-speed travel 14,927,717 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.824 mas

Total Proper Motion

64.544 mas/yr

PM Right Ascension

12.81 mas/yr

PM Declination

63.26 mas/yr

Galactic Cartesian (pc)

x = 0.272 · y = -0.607 · z = 0.747

Equatorial (J2000)

RA 294.12148° · Dec 48.34980°

Galactic ℓ, b

80.944° · 13.015°

Ecliptic λ, β

316.326° · 67.946°

HTM-20 index

-1856230514