Key parameters at a glance
- A radius of 11.19 Earth radii
- A mass of 182.43 Earth masses
- Surface gravity around 1.46 g
- An orbital period of 3.952 days
- Semi-major axis 0.0499 AU
- Equilibrium temperature 1,193 K (920 °C)
- Distance from Earth 1,089.48 light-years
- Earth Similarity Index 0.116
- Travel time at Voyager 1 speed 19,213,009 years
WASP-157 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1640of 1771
top 92.5%
This planet
11.19R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-157 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.19 | 11.21 |
| Mass (M⊕) | 1.00 | 182.43 | 317.83 |
| Density (g/cm³) | 5.51 | 0.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.46 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 182.434 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 179012583
Gaia DR2
Gaia DR2 3630269399833507200
Gaia DR3
Gaia DR3 3630269399833507200
System
WASP-157
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.95 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0499 AU.
Transit Fingerprint
Depth
0.763 %
Duration
1.853 h
Impact parameter b
0.870
Rp / R★
0.093500
Transit midpoint (BJD)
2,457,222.2386
Photometric dip
Transit produces a flux drop of 7,628 ppm lasting ≈ 1.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.093500
Semi-major axis / stellar radius
10.490
Impact parameter (b)
0.870
RV semi-amplitude (K)
61.600 m/s
Transit mid-time (BJD)
2,457,222.2386
Angular separation (arcsec)
0.14900
Eq. Temperature
1,193K
(920 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.116
0 = alien, 1 = Earth-identical
Insufficient insolation data — 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
Mo X10d Nik 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-157
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,772 K — cooler than the Sun (5,778 K)
Estimated Age
1.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.100 R☉
Stellar Mass
1.060 M☉
Metallicity [Fe/H]
0.25
Extended Stellar Properties
Surface gravity (log g)
4.380 dex
Stellar density
1.400 g/cm³
Systemic radial velocity
-21.95 km/s
Rotational v·sin i
1.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.966 mas
Total Proper Motion
32.909 mas/yr
PM Right Ascension
-31.73 mas/yr
PM Declination
-8.74 mas/yr
Galactic Cartesian (pc)
x = -0.920 · y = -0.365 · z = -0.145
Equatorial (J2000)
RA 201.65515° · Dec -8.31764°
Galactic ℓ, b
317.683° · 53.543°
Ecliptic λ, β
203.111° · 0.717°
HTM-20 index
1576593916
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