Key parameters at a glance
- A radius of 17.86 Earth radii
- A mass of 665.22 Earth masses
- Surface gravity around 2.09 g
- An orbital period of 1.220 days
- Semi-major axis 0.0239 AU
- Equilibrium temperature 2,782 K (2509 °C)
- Distance from Earth 397.73 light-years
- Earth Similarity Index 0.038
- Travel time at Voyager 1 speed 7,013,927 years
WASP-33 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#81of 1771
top 4.5%
This planet
17.86R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-33 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 17.86 | 11.21 |
| Mass (M⊕) | 1.00 | 665.22 | 317.83 |
| Density (g/cm³) | 5.51 | 0.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.09 | 2.53 |
| Insolation (S⊕) | 1.00 | 9,392.05 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 665.218 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 15082
HIP
HIP 11397
TIC
TIC 129979528
Gaia DR2
Gaia DR2 328636019723252096
Gaia DR3
Gaia DR3 328636019723252096
System
WASP-33
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.22 Earth days (0.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0239 AU.
Transit Fingerprint
Depth
1.216 %
Duration
2.854 h
Impact parameter b
0.210
Rp / R★
0.111800
Transit midpoint (BJD)
2,459,883.1988
Photometric dip
Transit produces a flux drop of 12,160 ppm lasting ≈ 2.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.111800
Semi-major axis / stellar radius
3.571
Impact parameter (b)
0.210
RV semi-amplitude (K)
304.000 m/s
Transit mid-time (BJD)
2,459,883.1988
Sky-projected obliquity (λ)
251.20°
True obliquity (ψ)
108.19°
Angular separation (arcsec)
0.19600
Eq. Temperature
2,782K
(2509 °C)
Insolation (S⊕)
9,392.05
Earth = 1.00
Earth Similarity (ESI)
0.038
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.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Collier Cameron et al. 2010Instrument
iKon-L CCD Camera
Publication
2010-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at SuperWASP (12 shown).
Host System: WASP-33
Spectral Class
A-type white
Effective Temperature
7,430 K — hotter than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
1.444 R☉
Stellar Mass
1.495 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.250 dex
Stellar density
0.700 g/cm³
Rotational v·sin i
85.60 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.172 mas
Total Proper Motion
9.030 mas/yr
PM Right Ascension
-0.98 mas/yr
PM Declination
-8.98 mas/yr
Galactic Cartesian (pc)
x = 0.636 · y = 0.474 · z = 0.609
Equatorial (J2000)
RA 36.71274° · Dec 37.55044°
Galactic ℓ, b
143.097° · -21.557°
Ecliptic λ, β
46.816° · 21.755°
HTM-20 index
533196778
Observation Record
Photometric series
1
RV measurements
1
Transmission spectra
1
Emission spectra
11
Archive notes
3
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