Key parameters at a glance

A radius of 1.83 Earth radii
A mass of 9.00 Earth masses
Surface gravity around 2.69 g
An orbital period of 0.790 days
Semi-major axis 0.0167 AU
Equilibrium temperature 1,992 K (1719 °C)
Distance from Earth 863.60 light-years
Earth Similarity Index 0.126
Travel time at Voyager 1 speed 15,229,512 years

3 siblings around WASP-47

WASP-47 e 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
WASP-47 e this	Super-Earth	1.83	9.00	0.790	1,992	2015
WASP-47 b	Gas Giant	12.86	374.00	4.159	1,275	2012
WASP-47 d	Sub-Neptune	3.65	15.50	9.031	885	2015
WASP-47 c	Unclassified	—	447.00	589.570	247	2015

WASP-47 e Planet Profile

Physical Specs

Radius

1.83 R⊕

Radius (Jupiter)

0.163 R♃

Mass

9.00 M⊕

Mass (Jupiter)

0.028 M♃

Density

6.29 g/cm³

Surface Gravity

2.69 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.126

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#221of 1176

top 18.7%

This planet

1.83R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-110 b 1.83 R⊕ TOI-1743 b 1.83 R⊕ K2-316 c 1.83 R⊕

Metric	Earth	WASP-47 e	Jupiter
Radius (R⊕)	1.00	1.83	11.21
Mass (M⊕)	1.00	9.00	317.83
Density (g/cm³)	5.51	6.29	1.33
Surface Gravity (g)	1.00	2.69	2.53
Insolation (S⊕)	1.00	3,740.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 102264230

Gaia DR2

Gaia DR2 2613413008919918976

Gaia DR3

Gaia DR3 2613413008919918976

System

WASP-47

Percentile among Super-Earth cohort

Radius 1.830 R⊕ · percentile 80 / cohort 1176

Mass 9.000 M⊕ · percentile 96 / cohort 1176

Orbital period 0.79 d · percentile 4 / cohort 1164

Distance 264.78 pc · percentile 29 / cohort 1171

ESI 0.126 · percentile 2 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

0.790 days

Semi-major axis

0.0167 AU

Eccentricity

0.000

Inclination

86.73 °

Year Length

A year here lasts roughly 19 hours long on a nearly circular orbit at a mean orbital distance of 0.0167 AU.

Transit Fingerprint

Depth

0.026 %

Duration

1.899 h

Impact parameter b

0.224

Rp / R★

0.014580

Transit midpoint (BJD)

2,457,012.1367

Photometric dip

Transit produces a flux drop of 258 ppm lasting ≈ 1.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014580

Semi-major axis / stellar radius

3.205

Impact parameter (b)

0.224

RV semi-amplitude (K)

4.550 m/s

Transit mid-time (BJD)

2,457,012.1367

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.06320

Eq. Temperature

1,992K

(1719 °C)

Insolation (S⊕)

3,740.00

Earth = 1.00

Earth Similarity (ESI)

0.126

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Becker et al. 2015

Instrument

Kepler CCD Array

Publication

2015-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2015 at K2 (12 shown).

K2-18 b · Sub-Neptune K2-9 b · Sub-Neptune K2-3 d · Super-Earth K2-3 c · Super-Earth K2-21 c · Sub-Neptune K2-5 c · Sub-Neptune K2-13 b · Super-Earth K2-3 b · Sub-Neptune K2-17 b · Sub-Neptune K2-21 b · Super-Earth K2-16 c · Sub-Neptune K2-5 b · Super-Earth

Host System: WASP-47

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,565 K — cooler than the Sun (5,778 K)

Estimated Age

6.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.156 R☉

Stellar Mass

1.058 M☉

Metallicity [Fe/H]

0.43

Extended Stellar Properties

Surface gravity (log g)

4.344 dex

Stellar density

0.998 g/cm³

Systemic radial velocity

-27.06 km/s

Rotational v·sin i

1.80 km/s

Rotation period

39.40 days

Activity index (log R'HK)

-5.201

Metallicity ratio

[Fe/H]

Distance

264.78 parsec

Light-years 863.60 ly

V-band magnitude

11.94 mag

Voyager-speed travel 15,229,512 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

3.750 mas

Total Proper Motion

43.956 mas/yr

PM Right Ascension

15.02 mas/yr

PM Declination

-41.31 mas/yr

Galactic Cartesian (pc)

x = 0.857 · y = -0.471 · z = -0.208

Equatorial (J2000)

RA 331.20309° · Dec -12.01907°

Galactic ℓ, b

45.748° · -48.187°

Ecliptic λ, β

328.992° · -0.209°

HTM-20 index

-1742555658