Key parameters at a glance
- A radius of 13.74 Earth radii
- A mass of 86.77 Earth masses
- Surface gravity around 0.46 g
- An orbital period of 5.322 days
- Semi-major axis 0.0608 AU
- Equilibrium temperature 1,460 K (1187 °C)
- Distance from Earth 652.56 light-years
- Earth Similarity Index 0.071
- Travel time at Voyager 1 speed 11,507,835 years
WASP-131 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#552of 1771
top 31.1%
This planet
13.74R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-131 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.74 | 11.21 |
| Mass (M⊕) | 1.00 | 86.77 | 317.83 |
| Density (g/cm³) | 5.51 | 0.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.46 | 2.53 |
| Insolation (S⊕) | 1.00 | 995.37 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 86.767 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 271168962
Gaia DR2
Gaia DR2 6173451477191225984
Gaia DR3
Gaia DR3 6173451477191225984
System
WASP-131
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.32 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0608 AU.
Transit Fingerprint
Depth
0.652 %
Duration
3.845 h
Impact parameter b
0.735
Rp / R★
0.081500
Transit midpoint (BJD)
2,458,282.2588
Photometric dip
Transit produces a flux drop of 6,517 ppm lasting ≈ 3.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.081500
Semi-major axis / stellar radius
8.370
Impact parameter (b)
0.735
RV semi-amplitude (K)
30.500 m/s
Transit mid-time (BJD)
2,458,282.2588
Sky-projected obliquity (λ)
162.40°
True obliquity (ψ)
123.70°
Angular separation (arcsec)
0.30400
Eq. Temperature
1,460K
(1187 °C)
Insolation (S⊕)
995.37
Earth = 1.00
Earth Similarity (ESI)
0.071
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
Hellier et al. 2017Instrument
iKon-L CCD Camera
Publication
2017-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at SuperWASP-South (11 shown).
Host System: WASP-131
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,990 K — hotter than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.561 R☉
Stellar Mass
1.060 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.075 dex
Stellar density
0.392 g/cm³
Systemic radial velocity
-19.66 km/s
Rotational v·sin i
2.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.971 mas
Total Proper Motion
14.249 mas/yr
PM Right Ascension
10.29 mas/yr
PM Declination
-9.85 mas/yr
Galactic Cartesian (pc)
x = -0.744 · y = -0.433 · z = -0.509
Equatorial (J2000)
RA 210.19357° · Dec -30.58361°
Galactic ℓ, b
320.153° · 29.959°
Ecliptic λ, β
218.859° · -17.133°
HTM-20 index
1286026204
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