Key parameters at a glance

A mass of 447.00 Earth masses
An orbital period of 589.570 days
Semi-major axis 1.3930 AU
Equilibrium temperature 247 K (-26 °C)
Distance from Earth 863.60 light-years
Travel time at Voyager 1 speed 15,229,512 years

3 siblings around WASP-47

WASP-47 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
WASP-47 e	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 this	Unclassified	—	447.00	589.570	247	2015

WASP-47 c Planet Profile

Physical Specs

Radius

— R⊕

Radius (Jupiter)

— R♃

Mass

447.00 M⊕

Mass (Jupiter)

1.406 M♃

Density

— g/cm³

Surface Gravity

— g (Earth)

Classification

Planet Type

Unclassified

ESI Score —

HZ Position Habitable

Controversial No

Discovery

Year 2015

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Metric	Earth	WASP-47 c	Jupiter
Radius (R⊕)	1.00	—	11.21
Mass (M⊕)	1.00	447.00	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	—	2.53
Insolation (S⊕)	1.00	0.55	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	447.000 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	398.900 M⊕	Lower bound from radial-velocity fitting.
Computed mass	380.521 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 102264230

Gaia DR2

Gaia DR2 2613413008919918976

Gaia DR3

Gaia DR3 2613413008919918976

System

WASP-47

Percentile among Unclassified cohort

Mass 447.000 M⊕ · percentile 10 / cohort 42

Orbital period 589.57 d · percentile 65 / cohort 43

Distance 264.78 pc · percentile 91 / cohort 43

Orbit & Habitability

Orbital Dynamics

Period

589.570 days

Semi-major axis

1.3930 AU

Eccentricity

0.264

Inclination

90.00 °

Year Length

A year here lasts about 1.61 Earth years on a mildly elliptical path at a mean orbital distance of 1.3930 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

261.400

RV semi-amplitude (K)

31.040 m/s

Transit mid-time (BJD)

2,457,763.1000

Long. of periastron (ω)

111.80°

Angular separation (arcsec)

5.26000

Eq. Temperature

247K

(-26 °C)

Insolation (S⊕)

0.55

Earth = 1.00

Earth Similarity (ESI)

—

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen.

Discovery Paper

Primary reference

Neveu Vanmalle et al. 2015

Instrument

CORALIE Spectrograph

Publication

2015-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at La Silla Observatory (10 shown).

Wolf 1061 b · Rocky Terrestrial Wolf 1061 c · Super-Earth HD 1461 c · Sub-Neptune GJ 3341 b · Sub-Neptune Wolf 1061 d · Sub-Neptune HD 204313 c · Neptune-like GJ 3293 c · Neptune-like GJ 3293 b · Neptune-like WASP-41 c · Gas Giant HD 175607 b · Unclassified

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