Key parameters at a glance
- A radius of 15.58 Earth radii
- A mass of 1,541.48 Earth masses
- Surface gravity around 6.35 g
- An orbital period of 3.611 days
- Semi-major axis 0.0514 AU
- Equilibrium temperature 1,749 K (1476 °C)
- Distance from Earth 1,243.22 light-years
- Earth Similarity Index 0.082
- Travel time at Voyager 1 speed 21,924,216 years
WASP-120 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#193of 1771
top 10.8%
This planet
15.58R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-120 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.58 | 11.21 |
| Mass (M⊕) | 1.00 | 1,541.48 | 317.83 |
| Density (g/cm³) | 5.51 | 2.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.35 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,818.55 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,541.476 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 152476657
Gaia DR2
Gaia DR2 4837286842167819776
Gaia DR3
Gaia DR3 4837286842168217088
System
WASP-120
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.61 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0514 AU.
Transit Fingerprint
Depth
0.568 %
Duration
3.538 h
Impact parameter b
0.650
Rp / R★
0.075100
Transit midpoint (BJD)
2,456,779.4347
Photometric dip
Transit produces a flux drop of 5,684 ppm lasting ≈ 3.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.075100
Semi-major axis / stellar radius
6.800
Impact parameter (b)
0.650
RV semi-amplitude (K)
509.000 m/s
Transit mid-time (BJD)
2,456,779.4347
Long. of periastron (ω)
333.00°
Angular separation (arcsec)
0.13500
Eq. Temperature
1,749K
(1476 °C)
Insolation (S⊕)
1,818.55
Earth = 1.00
Earth Similarity (ESI)
0.082
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
Turner et al. 2016Instrument
iKon-L CCD Camera
Publication
2016-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at SuperWASP (11 shown).
Host System: WASP-120
Spectral Class
F-type yellow-white
Effective Temperature
6,450 K — hotter than the Sun (5,778 K)
Estimated Age
0.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.684 R☉
Stellar Mass
1.393 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.035 dex
Stellar density
0.299 g/cm³
Systemic radial velocity
19.84 km/s
Rotational v·sin i
15.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.595 mas
Total Proper Motion
6.932 mas/yr
PM Right Ascension
2.38 mas/yr
PM Declination
-6.51 mas/yr
Galactic Cartesian (pc)
x = 0.320 · y = 0.618 · z = -0.718
Equatorial (J2000)
RA 62.61608° · Dec -45.89824°
Galactic ℓ, b
252.187° · -46.684°
Ecliptic λ, β
41.307° · -64.777°
HTM-20 index
-2131613910
Similar Worlds
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Gas Giant · F-type yellow-white
Radius 15.56 R⊕ · 2,878.2 ly
HAT-P-9 b
Gas Giant · F-type yellow-white
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WASP-87 b
Gas Giant · F-type yellow-white
Radius 15.52 R⊕ · 973.2 ly
HATS-24 b
Gas Giant · F-type yellow-white
Radius 15.64 R⊕ · 1,611.8 ly
TOI-1333 b
Gas Giant · F-type yellow-white
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HATS-52 b
Gas Giant · F-type yellow-white
Radius 15.49 R⊕ · 1,810.6 ly