Key parameters at a glance
- A radius of 12.81 Earth radii
- A mass of 791.40 Earth masses
- Surface gravity around 4.82 g
- An orbital period of 5.406 days
- Semi-major axis 0.0673 AU
- Equilibrium temperature 1,557 K (1284 °C)
- Distance from Earth 1,118.98 light-years
- Earth Similarity Index 0.099
- Travel time at Voyager 1 speed 19,733,141 years
WASP-161 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1058of 1771
top 59.7%
This planet
12.81R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-161 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.81 | 11.21 |
| Mass (M⊕) | 1.00 | 791.40 | 317.83 |
| Density (g/cm³) | 5.51 | 2.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.82 | 2.53 |
| Insolation (S⊕) | 1.00 | 990.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 791.397 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 50712784
Gaia DR2
Gaia DR2 5751177095877066496
Gaia DR3
Gaia DR3 5751177095877066496
System
WASP-161
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.41 Earth days (1.5% of a terrestrial year) at a mean orbital distance of 0.0673 AU.
Transit Fingerprint
Depth
0.451 %
Duration
5.129 h
Impact parameter b
0.140
Rp / R★
0.067100
Transit midpoint (BJD)
2,457,416.5289
Photometric dip
Transit produces a flux drop of 4,509 ppm lasting ≈ 5.13 h.
Extended Orbital Architecture
Planet / star radius ratio
0.067100
Semi-major axis / stellar radius
8.490
Impact parameter (b)
0.140
RV semi-amplitude (K)
230.000 m/s
Transit mid-time (BJD)
2,457,416.5289
Angular separation (arcsec)
0.19600
Eq. Temperature
1,557K
(1284 °C)
Insolation (S⊕)
990.00
Earth = 1.00
Earth Similarity (ESI)
0.099
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
Barkaoui et al. 2019Instrument
iKon-L CCD Camera
Publication
2019-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at SuperWASP-South (12 shown).
Host System: WASP-161
Spectral Class
F-type yellow-white
Effective Temperature
6,400 K — hotter than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
1.712 R☉
Stellar Mass
1.390 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.111 dex
Stellar density
0.398 g/cm³
Systemic radial velocity
37.44 km/s
Rotational v·sin i
18.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.886 mas
Total Proper Motion
5.420 mas/yr
PM Right Ascension
-5.39 mas/yr
PM Declination
-0.59 mas/yr
Galactic Cartesian (pc)
x = -0.581 · y = 0.789 · z = -0.199
Equatorial (J2000)
RA 126.33782° · Dec -11.50099°
Galactic ℓ, b
234.510° · 14.865°
Ecliptic λ, β
131.994° · -29.797°
HTM-20 index
42620812
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