Key parameters at a glance
- A radius of 16.14 Earth radii
- A mass of 163.36 Earth masses
- Surface gravity around 0.63 g
- An orbital period of 4.046 days
- Semi-major axis 0.0545 AU
- Equilibrium temperature 1,729 K (1456 °C)
- Distance from Earth 1,228.49 light-years
- Earth Similarity Index 0.058
- Travel time at Voyager 1 speed 21,664,467 years
WASP-118 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#146of 1771
top 8.2%
This planet
16.14R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-118 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.14 | 11.21 |
| Mass (M⊕) | 1.00 | 163.36 | 317.83 |
| Density (g/cm³) | 5.51 | 0.23 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.63 | 2.53 |
| Insolation (S⊕) | 1.00 | 6,586.47 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 163.365 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 380907135
Gaia DR2
Gaia DR2 2562569564026683520
Gaia DR3
Gaia DR3 2562569564026683520
System
WASP-118
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.05 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0545 AU.
Transit Fingerprint
Depth
0.755 %
Duration
4.805 h
Impact parameter b
0.160
Rp / R★
0.080590
Transit midpoint (BJD)
2,456,787.8142
Photometric dip
Transit produces a flux drop of 7,550 ppm lasting ≈ 4.80 h.
Extended Orbital Architecture
Planet / star radius ratio
0.080590
Semi-major axis / stellar radius
6.920
Impact parameter (b)
0.160
RV semi-amplitude (K)
54.600 m/s
Transit mid-time (BJD)
2,456,787.8142
Long. of periastron (ω)
0.00°
Angular separation (arcsec)
0.14500
Eq. Temperature
1,729K
(1456 °C)
Insolation (S⊕)
6,586.47
Earth = 1.00
Earth Similarity (ESI)
0.058
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
Hay et al. 2016Instrument
iKon-L CCD Camera
Publication
2016-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at SuperWASP (11 shown).
Host System: WASP-118
Spectral Class
F-type yellow-white
Effective Temperature
6,410 K — hotter than the Sun (5,778 K)
Estimated Age
1.17 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.696 R☉
Stellar Mass
1.320 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.100 dex
Stellar density
0.382 g/cm³
Systemic radial velocity
5.88 km/s
Rotational v·sin i
9.68 km/s
Rotation period
6.12 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.628 mas
Total Proper Motion
14.801 mas/yr
PM Right Ascension
2.46 mas/yr
PM Declination
-14.59 mas/yr
Galactic Cartesian (pc)
x = 0.941 · y = 0.334 · z = 0.047
Equatorial (J2000)
RA 19.55059° · Dec 2.70278°
Galactic ℓ, b
136.180° · -59.479°
Ecliptic λ, β
19.068° · -5.146°
HTM-20 index
-476830732
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