Key parameters at a glance
- A radius of 12.86 Earth radii
- A mass of 374.00 Earth masses
- Surface gravity around 2.26 g
- An orbital period of 4.159 days
- Semi-major axis 0.0520 AU
- Equilibrium temperature 1,275 K (1002 °C)
- Distance from Earth 863.60 light-years
- Earth Similarity Index 0.112
- Travel time at Voyager 1 speed 15,229,512 years
3 siblings around WASP-47
WASP-47 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.
WASP-47 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1054of 1771
top 59.5%
This planet
12.86R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-47 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.86 | 11.21 |
| Mass (M⊕) | 1.00 | 374.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.26 | 2.53 |
| Insolation (S⊕) | 1.00 | 409.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 374.000 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 Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.16 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0520 AU.
Transit Fingerprint
Depth
1.271 %
Duration
3.572 h
Impact parameter b
0.173
Rp / R★
0.101930
Transit midpoint (BJD)
2,459,407.7620
Photometric dip
Transit produces a flux drop of 12,712 ppm lasting ≈ 3.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.101930
Semi-major axis / stellar radius
9.700
Impact parameter (b)
0.173
RV semi-amplitude (K)
140.840 m/s
Transit mid-time (BJD)
2,459,407.7620
Long. of periastron (ω)
89.00°
Sky-projected obliquity (λ)
0.00°
True obliquity (ψ)
29.20°
Angular separation (arcsec)
0.19600
Eq. Temperature
1,275K
(1002 °C)
Insolation (S⊕)
409.00
Earth = 1.00
Earth Similarity (ESI)
0.112
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Hellier et al. 2012Instrument
iKon-L CCD Camera
Publication
2012-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2012 at SuperWASP (12 shown).
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]
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
Similar Worlds
TOI-4914 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.87 R⊕ · 978.1 ly
TOI-2842 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.85 R⊕ · 1,503.6 ly
Kepler-422 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.89 R⊕ · 2,357.4 ly
WASP-67 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.89 R⊕ · 618.0 ly
HAT-P-22 b
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Radius 12.89 R⊕ · 266.7 ly
WASP-98 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.82 R⊕ · 918.9 ly