Key parameters at a glance
- A radius of 13.67 Earth radii
- A mass of 114.42 Earth masses
- Surface gravity around 0.61 g
- An orbital period of 4.353 days
- Semi-major axis 0.0536 AU
- Equilibrium temperature 1,531 K (1258 °C)
- Distance from Earth 742.13 light-years
- Earth Similarity Index 0.068
- Travel time at Voyager 1 speed 13,087,384 years
WASP-13 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#596of 1771
top 33.6%
This planet
13.67R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-13 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.67 | 11.21 |
| Mass (M⊕) | 1.00 | 114.42 | 317.83 |
| Density (g/cm³) | 5.51 | 0.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.61 | 2.53 |
| Insolation (S⊕) | 1.00 | 617.31 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 114.419 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 8767448
Gaia DR2
Gaia DR2 702295464353437952
Gaia DR3
Gaia DR3 702295464353437952
System
WASP-13
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.35 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0536 AU.
Transit Fingerprint
Depth
0.840 %
Duration
4.003 h
Impact parameter b
0.574
Rp / R★
0.093200
Transit midpoint (BJD)
2,458,883.8033
Photometric dip
Transit produces a flux drop of 8,400 ppm lasting ≈ 4.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.093200
Semi-major axis / stellar radius
7.350
Impact parameter (b)
0.574
RV semi-amplitude (K)
55.500 m/s
Transit mid-time (BJD)
2,458,883.8033
Sky-projected obliquity (λ)
8.00°
Angular separation (arcsec)
0.23600
Eq. Temperature
1,531K
(1258 °C)
Insolation (S⊕)
617.31
Earth = 1.00
Earth Similarity (ESI)
0.068
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
Skillen et al. 2009Instrument
iKon-L CCD Camera
Publication
2009-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at SuperWASP (6 shown).
Host System: WASP-13
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,950 K — hotter than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.370 R☉
Stellar Mass
0.720 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.060 dex
Stellar density
0.400 g/cm³
Systemic radial velocity
9.83 km/s
Rotational v·sin i
5.70 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.367 mas
Total Proper Motion
20.433 mas/yr
PM Right Ascension
-2.15 mas/yr
PM Declination
-20.32 mas/yr
Galactic Cartesian (pc)
x = -0.637 · y = 0.532 · z = 0.557
Equatorial (J2000)
RA 140.10297° · Dec 33.88233°
Galactic ℓ, b
190.929° · 44.536°
Ecliptic λ, β
131.878° · 17.438°
HTM-20 index
-1885389276
Observation Record
Photometric series
3
RV measurements
1
Emission spectra
1
Archive notes
1
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