Key parameters at a glance

A radius of 7.04 Earth radii
A mass of 19.02 Earth masses
Surface gravity around 0.38 g
An orbital period of 187.366 days
Semi-major axis 0.6992 AU
Distance from Earth 3,343.16 light-years
Earth Similarity Index 0.320
Travel time at Voyager 1 speed 58,956,698 years

2 siblings around Kepler-47

Kepler-47 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-47 b	Sub-Neptune	3.05	2.07	49.464	—	2012
Kepler-47 d this	Neptune-like	7.04	19.02	187.366	—	2019
Kepler-47 c	Neptune-like	4.65	3.17	303.227	—	2012

brightness_6

Circumbinary planet

Kepler-47 d orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

Kepler-47 d Planet Profile

Physical Specs

Radius

7.04 R⊕

Radius (Jupiter)

0.628 R♃

Mass

19.02 M⊕

Mass (Jupiter)

0.060 M♃

Density

0.30 g/cm³

Surface Gravity

0.38 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.320

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#200of 574

top 34.7%

This planet

7.04R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

KMT-2023-BLG-0469L b 7.04 R⊕ Kepler-1519 b 7.06 R⊕ WASP-166 b 7.06 R⊕

Metric	Earth	Kepler-47 d	Jupiter
Radius (R⊕)	1.00	7.04	11.21
Mass (M⊕)	1.00	19.02	317.83
Density (g/cm³)	5.51	0.30	1.33
Surface Gravity (g)	1.00	0.38	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	19.020 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 271548206

Gaia DR2

Gaia DR2 2080506523540902912

Gaia DR3

Gaia DR3 2080506523540902912

System

Kepler-47

Percentile among Neptune-like cohort

Radius 7.040 R⊕ · percentile 65 / cohort 574

Mass 19.020 M⊕ · percentile 25 / cohort 574

Orbital period 187.37 d · percentile 88 / cohort 524

Distance 1,025.02 pc · percentile 74 / cohort 572

ESI 0.320 · percentile 55 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

187.366 days

Semi-major axis

0.6992 AU

Eccentricity

0.024

Inclination

90.40 °

Year Length

A year here lasts approximately 187.37 Earth days (51.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6992 AU.

Transit Fingerprint

Rp / R★

0.068730

Transit midpoint (BJD)

2,455,045.4280

Extended Orbital Architecture

Planet / star radius ratio

0.068730

Transit mid-time (BJD)

2,455,045.4280

Long. of periastron (ω)

352.00°

Angular separation (arcsec)

0.68200

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.320

0 = alien, 1 = Earth-identical

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

Orosz et al. 2019

Instrument

Kepler CCD Array

Publication

2019-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at Kepler (2 shown).

KOI-1599.01 · Super-Earth KOI-1599.02 · Super-Earth

Host System: Kepler-47

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,636 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.936 R☉

Stellar Mass

0.957 M☉

Metallicity [Fe/H]

-0.25

Extended Stellar Properties

Surface gravity (log g)

4.492 dex

Stellar density

1.650 g/cm³

Rotational v·sin i

4.10 km/s

Metallicity ratio

[M/H]

Distance

1,025.02 parsec

Light-years 3,343.16 ly

V-band magnitude

15.31 mag

Voyager-speed travel 58,956,698 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.948 mas

Total Proper Motion

10.655 mas/yr

PM Right Ascension

-3.49 mas/yr

PM Declination

-10.07 mas/yr

Galactic Cartesian (pc)

x = 0.292 · y = -0.618 · z = 0.730

Equatorial (J2000)

RA 295.29789° · Dec 46.92043°

Galactic ℓ, b

80.007° · 11.661°

Ecliptic λ, β

316.595° · 66.315°

HTM-20 index

-1160210418