Key parameters at a glance
- A radius of 18.15 Earth radii
- A mass of 632.48 Earth masses
- Surface gravity around 1.92 g
- An orbital period of 2.724 days
- Semi-major axis 0.0505 AU
- Equilibrium temperature 3,353 K (3080 °C)
- Distance from Earth 325.28 light-years
- Earth Similarity Index 0.029
- Travel time at Voyager 1 speed 5,736,289 years
WASP-189 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#66of 1771
top 3.7%
This planet
18.15R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-189 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 18.15 | 11.21 |
| Mass (M⊕) | 1.00 | 632.48 | 317.83 |
| Density (g/cm³) | 5.51 | 0.62 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.92 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 632.479 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 133112
HIP
HIP 73608
TIC
TIC 157910432
Gaia DR2
Gaia DR2 6339097679918871168
Gaia DR3
Gaia DR3 6339097679918871168
System
WASP-189
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.72 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0505 AU.
Transit Fingerprint
Duration
4.334 h
Impact parameter b
0.478
Rp / R★
0.070450
Transit midpoint (BJD)
2,458,926.5417
Extended Orbital Architecture
Planet / star radius ratio
0.070450
Semi-major axis / stellar radius
4.600
Impact parameter (b)
0.478
RV semi-amplitude (K)
182.000 m/s
Occultation depth
0.009 ppm
Transit mid-time (BJD)
2,458,926.5417
Sky-projected obliquity (λ)
86.40°
True obliquity (ψ)
89.60°
Angular separation (arcsec)
0.50700
Eq. Temperature
3,353K
(3080 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.029
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.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Lendl et al. 2020Instrument
Teledyne e2v CCD detector
Publication
2020-11
Observation locale
Space
Host System: WASP-189
Spectral Class
A-type white
Effective Temperature
8,000 K — hotter than the Sun (5,778 K)
Estimated Age
0.73 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.360 R☉
Stellar Mass
2.030 M☉
Metallicity [Fe/H]
0.29
Extended Stellar Properties
Surface gravity (log g)
3.900 dex
Stellar density
0.228 g/cm³
Rotational v·sin i
93.10 km/s
Rotation period
1.20 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
9.999 mas
Total Proper Motion
55.880 mas/yr
PM Right Ascension
-50.56 mas/yr
PM Declination
-23.79 mas/yr
Galactic Cartesian (pc)
x = -0.698 · y = -0.715 · z = -0.053
Equatorial (J2000)
RA 225.68673° · Dec -3.03149°
Galactic ℓ, b
354.491° · 46.278°
Ecliptic λ, β
224.121° · 13.633°
HTM-20 index
700161421
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