Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 198.96 Earth masses
- Surface gravity around 1.72 g
- An orbital period of 3.812 days
- Semi-major axis 0.0440 AU
- Equilibrium temperature 994 K (721 °C)
- Distance from Earth 702.87 light-years
- Earth Similarity Index 0.152
- Travel time at Voyager 1 speed 12,395,102 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-154 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1696of 1771
top 95.7%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-154 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 198.96 | 317.83 |
| Density (g/cm³) | 5.51 | 0.88 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 162.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 198.961 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 857186
Gaia DR2
Gaia DR2 2618260274650146048
Gaia DR3
Gaia DR3 2618260274650146048
System
WASP-154
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.81 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0440 AU.
Transit Fingerprint
Depth
1.440 %
Duration
2.565 h
Impact parameter b
0.310
Rp / R★
0.120000
Transit midpoint (BJD)
2,459,465.8920
Photometric dip
Transit produces a flux drop of 14,400 ppm lasting ≈ 2.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.120000
Semi-major axis / stellar radius
11.560
Impact parameter (b)
0.310
RV semi-amplitude (K)
94.550 m/s
Transit mid-time (BJD)
2,459,465.8920
Angular separation (arcsec)
0.20400
Eq. Temperature
994K
(721 °C)
Insolation (S⊕)
162.00
Earth = 1.00
Earth Similarity (ESI)
0.152
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Schanche et al. 2025Instrument
e2v CCD Camera
Publication
2025-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at SuperWASP (8 shown).
Host System: WASP-154
Spectral Class
K-type orange
Effective Temperature
4,774 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.823 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.470 dex
Stellar density
2.012 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.612 mas
Total Proper Motion
62.146 mas/yr
PM Right Ascension
-24.52 mas/yr
PM Declination
-57.10 mas/yr
Galactic Cartesian (pc)
x = 0.836 · y = -0.528 · z = -0.150
Equatorial (J2000)
RA 327.71917° · Dec -8.63595°
Galactic ℓ, b
47.670° · -43.561°
Ecliptic λ, β
326.931° · 4.144°
HTM-20 index
-310973456
Similar Worlds
WASP-105 b
Gas Giant · K-type orange
Radius 10.76 R⊕ · 552.1 ly
HAT-P-12 b
Gas Giant · K-type orange
Radius 10.75 R⊕ · 465.6 ly
TOI-5616 b
Gas Giant · K-type orange
Radius 10.78 R⊕ · 1,273.4 ly
WASP-23 b
Gas Giant · K-type orange
Radius 10.78 R⊕ · 676.7 ly
IRAS 04125+2902 b
Gas Giant · K-type orange
Radius 10.74 R⊕ · 519.4 ly
WASP-84 b
Gas Giant · K-type orange
Radius 10.72 R⊕ · 328.1 ly