Key parameters at a glance
- A radius of 15.69 Earth radii
- A mass of 746.90 Earth masses
- Surface gravity around 3.03 g
- An orbital period of 4.086 days
- Semi-major axis 0.0546 AU
- Equilibrium temperature 1,570 K (1297 °C)
- Distance from Earth 1,631.62 light-years
- Earth Similarity Index 0.085
- Travel time at Voyager 1 speed 28,773,643 years
WASP-66 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#180of 1771
top 10.1%
This planet
15.69R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-66 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.69 | 11.21 |
| Mass (M⊕) | 1.00 | 746.90 | 317.83 |
| Density (g/cm³) | 5.51 | 1.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,434.77 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 746.901 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 53735810
Gaia DR2
Gaia DR2 5444147952811517696
Gaia DR3
Gaia DR3 5444147952811517696
System
WASP-66
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.09 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0546 AU.
Transit Fingerprint
Depth
0.670 %
Duration
4.502 h
Impact parameter b
0.480
Rp / R★
0.081700
Transit midpoint (BJD)
2,457,477.7107
Photometric dip
Transit produces a flux drop of 6,700 ppm lasting ≈ 4.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.081700
Semi-major axis / stellar radius
6.730
Impact parameter (b)
0.480
RV semi-amplitude (K)
246.000 m/s
Transit mid-time (BJD)
2,457,477.7107
Sky-projected obliquity (λ)
-4.00°
Angular separation (arcsec)
0.10900
Eq. Temperature
1,570K
(1297 °C)
Insolation (S⊕)
1,434.77
Earth = 1.00
Earth Similarity (ESI)
0.085
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
Hellier et al. 2012Instrument
iKon-L CCD Camera
Publication
2012-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2012 at SuperWASP (12 shown).
Host System: WASP-66
Spectral Class
F-type yellow-white
Effective Temperature
6,600 K — hotter than the Sun (5,778 K)
Estimated Age
3.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.760 R☉
Stellar Mass
1.330 M☉
Metallicity [Fe/H]
-0.31
Extended Stellar Properties
Surface gravity (log g)
4.300 dex
Stellar density
0.340 g/cm³
Systemic radial velocity
-10.02 km/s
Rotational v·sin i
11.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.972 mas
Total Proper Motion
17.754 mas/yr
PM Right Ascension
11.49 mas/yr
PM Declination
-13.53 mas/yr
Galactic Cartesian (pc)
x = -0.761 · y = 0.304 · z = -0.573
Equatorial (J2000)
RA 158.22503° · Dec -34.98991°
Galactic ℓ, b
273.274° · 19.782°
Ecliptic λ, β
176.181° · -40.316°
HTM-20 index
-1453676768
Similar Worlds
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HD 143811 AB b
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Radius 15.69 R⊕ · 445.6 ly
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