Key parameters at a glance
- A radius of 14.91 Earth radii
- A mass of 305.12 Earth masses
- Surface gravity around 1.37 g
- An orbital period of 4.955 days
- Semi-major axis 0.0617 AU
- Equilibrium temperature 1,487 K (1214 °C)
- Distance from Earth 529.36 light-years
- Earth Similarity Index 0.082
- Travel time at Voyager 1 speed 9,335,280 years
WASP-7 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#237of 1771
top 13.3%
This planet
14.91R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-7 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.91 | 11.21 |
| Mass (M⊕) | 1.00 | 305.12 | 317.83 |
| Density (g/cm³) | 5.51 | 0.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 612.69 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 305.117 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 197286
TIC
TIC 389352124
Gaia DR2
Gaia DR2 6681720724498802176
Gaia DR3
Gaia DR3 6681720724498802176
System
WASP-7
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.95 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0617 AU.
Transit Fingerprint
Depth
0.736 %
Duration
3.639 h
Impact parameter b
0.530
Rp / R★
0.095600
Transit midpoint (BJD)
2,455,446.6349
Photometric dip
Transit produces a flux drop of 7,357 ppm lasting ≈ 3.64 h.
Extended Orbital Architecture
Planet / star radius ratio
0.095600
Semi-major axis / stellar radius
9.074
Impact parameter (b)
0.530
RV semi-amplitude (K)
97.000 m/s
Transit mid-time (BJD)
2,455,446.6349
Long. of periastron (ω)
109.00°
Sky-projected obliquity (λ)
86.00°
Angular separation (arcsec)
0.38000
Eq. Temperature
1,487K
(1214 °C)
Insolation (S⊕)
612.69
Earth = 1.00
Earth Similarity (ESI)
0.082
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. 2008Instrument
iKon-L CCD Camera
Publication
2009-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2008 at SuperWASP (5 shown).
Host System: WASP-7
Spectral Class
F-type yellow-white
Effective Temperature
6,400 K — hotter than the Sun (5,778 K)
Estimated Age
2.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.432 R☉
Stellar Mass
1.276 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.232 dex
Stellar density
0.611 g/cm³
Systemic radial velocity
-29.85 km/s
Rotational v·sin i
17.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.133 mas
Total Proper Motion
64.945 mas/yr
PM Right Ascension
30.47 mas/yr
PM Declination
-57.36 mas/yr
Galactic Cartesian (pc)
x = 0.509 · y = -0.584 · z = -0.632
Equatorial (J2000)
RA 311.04276° · Dec -39.22549°
Galactic ℓ, b
2.822° · -37.877°
Ecliptic λ, β
302.852° · -20.352°
HTM-20 index
1788317856
Observation Record
Photometric series
1
RV measurements
1
Emission spectra
2
Similar Worlds
HATS-41 b
Gas Giant · F-type yellow-white
Radius 14.91 R⊕ · 2,405.9 ly
WASP-100 b
Gas Giant · F-type yellow-white
Radius 14.91 R⊕ · 1,188.5 ly
HAT-P-58 b
Gas Giant · F-type yellow-white
Radius 14.93 R⊕ · 1,681.6 ly
HAT-P-35 b
Gas Giant · F-type yellow-white
Radius 14.93 R⊕ · 1,653.5 ly
Kepler-471 b
Gas Giant · F-type yellow-white
Radius 14.96 R⊕ · 4,075.0 ly
WASP-188 b
Gas Giant · F-type yellow-white
Radius 14.82 R⊕ · 2,202.5 ly