Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 87.40 Earth masses
- Surface gravity around 0.56 g
- An orbital period of 4.603 days
- Semi-major axis 0.0549 AU
- Equilibrium temperature 1,404 K (1131 °C)
- Distance from Earth 1,422.36 light-years
- Earth Similarity Index 0.080
- Travel time at Voyager 1 speed 25,083,314 years
WASP-147 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1282of 1771
top 72.3%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-147 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 87.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.56 | 2.53 |
| Insolation (S⊕) | 1.00 | 639.49 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 87.403 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 114749636
Gaia DR2
Gaia DR2 2340919358581488768
Gaia DR3
Gaia DR3 2340919358581488768
System
WASP-147
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.60 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0549 AU.
Transit Fingerprint
Depth
0.640 %
Duration
4.394 h
Impact parameter b
0.310
Rp / R★
0.080000
Transit midpoint (BJD)
2,456,562.5950
Photometric dip
Transit produces a flux drop of 6,400 ppm lasting ≈ 4.39 h.
Extended Orbital Architecture
Planet / star radius ratio
0.080000
Semi-major axis / stellar radius
8.290
Impact parameter (b)
0.310
RV semi-amplitude (K)
32.700 m/s
Transit mid-time (BJD)
2,456,562.5950
Angular separation (arcsec)
0.12600
Eq. Temperature
1,404K
(1131 °C)
Insolation (S⊕)
639.49
Earth = 1.00
Earth Similarity (ESI)
0.080
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
Lendl et al. 2019Instrument
iKon-L CCD Camera
Publication
2019-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at SuperWASP-South (12 shown).
Host System: WASP-147
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,702 K — cooler than the Sun (5,778 K)
Estimated Age
8.47 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.429 R☉
Stellar Mass
1.044 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.210 dex
Stellar density
0.509 g/cm³
Systemic radial velocity
-1.62 km/s
Rotational v·sin i
0.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.265 mas
Total Proper Motion
8.748 mas/yr
PM Right Ascension
-5.29 mas/yr
PM Declination
-6.96 mas/yr
Galactic Cartesian (pc)
x = 0.926 · y = -0.013 · z = -0.377
Equatorial (J2000)
RA 359.19151° · Dec -22.15323°
Galactic ℓ, b
51.793° · -76.628°
Ecliptic λ, β
350.075° · -19.924°
HTM-20 index
243735814
Similar Worlds
HD 181234 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 155.7 ly
HD 183263 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 176.8 ly
WASP-8 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 293.4 ly
HD 156279 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 118.1 ly
HD 156279 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 118.1 ly
OGLE-2019-BLG-0468L c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 14,350.9 ly