Key parameters at a glance
- A radius of 13.79 Earth radii
- A mass of 212.95 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 3.533 days
- Semi-major axis 0.0470 AU
- Equilibrium temperature 1,502 K (1229 °C)
- Distance from Earth 1,036.04 light-years
- Earth Similarity Index 0.079
- Travel time at Voyager 1 speed 18,270,583 years
WASP-22 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#540of 1771
top 30.4%
This planet
13.79R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-22 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.79 | 11.21 |
| Mass (M⊕) | 1.00 | 212.95 | 317.83 |
| Density (g/cm³) | 5.51 | 0.44 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 837.70 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 212.946 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 257567854
Gaia DR2
Gaia DR2 5086537022856406272
Gaia DR3
Gaia DR3 5086537022856406272
System
WASP-22
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.53 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0470 AU.
Transit Fingerprint
Depth
1.000 %
Duration
3.480 h
Impact parameter b
0.130
Rp / R★
0.100100
Transit midpoint (BJD)
2,456,850.4360
Photometric dip
Transit produces a flux drop of 10,000 ppm lasting ≈ 3.48 h.
Extended Orbital Architecture
Planet / star radius ratio
0.100100
Semi-major axis / stellar radius
8.940
Impact parameter (b)
0.130
RV semi-amplitude (K)
70.000 m/s
Transit mid-time (BJD)
2,456,850.4360
Long. of periastron (ω)
27.00°
Sky-projected obliquity (λ)
22.00°
Angular separation (arcsec)
0.14800
Eq. Temperature
1,502K
(1229 °C)
Insolation (S⊕)
837.70
Earth = 1.00
Earth Similarity (ESI)
0.079
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
Maxted et al. 2010Instrument
iKon-L CCD Camera
Publication
2010-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at SuperWASP (12 shown).
Host System: WASP-22
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,000 K — hotter than the Sun (5,778 K)
Estimated Age
3.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.240 R☉
Stellar Mass
1.460 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
1.080 g/cm³
Systemic radial velocity
-7.19 km/s
Rotational v·sin i
4.50 km/s
Rotation period
16.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.120 mas
Total Proper Motion
26.575 mas/yr
PM Right Ascension
1.77 mas/yr
PM Declination
-26.52 mas/yr
Galactic Cartesian (pc)
x = 0.553 · y = 0.729 · z = -0.404
Equatorial (J2000)
RA 52.81804° · Dec -23.81979°
Galactic ℓ, b
216.796° · -53.923°
Ecliptic λ, β
42.578° · -41.335°
HTM-20 index
1145279409
Similar Worlds
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Gas Giant · G-type yellow (Sun-like)
Radius 13.79 R⊕ · 1,659.8 ly
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Kepler-427 b
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HD 102956 b
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