Key parameters at a glance
- A radius of 12.44 Earth radii
- A mass of 251.09 Earth masses
- Surface gravity around 1.62 g
- An orbital period of 3.722 days
- Semi-major axis 0.0435 AU
- Equilibrium temperature 992 K (719 °C)
- Distance from Earth 406.81 light-years
- Earth Similarity Index 0.137
- Travel time at Voyager 1 speed 7,174,171 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-11 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1287of 1771
top 72.6%
This planet
12.44R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-11 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.44 | 11.21 |
| Mass (M⊕) | 1.00 | 251.09 | 317.83 |
| Density (g/cm³) | 5.51 | 0.63 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.62 | 2.53 |
| Insolation (S⊕) | 1.00 | 184.99 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 251.086 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 85593751
Gaia DR2
Gaia DR2 123376685084303360
Gaia DR3
Gaia DR3 123376685084303360
System
WASP-11
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.72 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0435 AU.
Transit Fingerprint
Depth
1.600 %
Duration
2.556 h
Impact parameter b
0.054
Rp / R★
0.131000
Transit midpoint (BJD)
2,456,933.6153
Photometric dip
Transit produces a flux drop of 16,000 ppm lasting ≈ 2.56 h.
Extended Orbital Architecture
Planet / star radius ratio
0.131000
Semi-major axis / stellar radius
12.710
Impact parameter (b)
0.054
RV semi-amplitude (K)
82.100 m/s
Transit mid-time (BJD)
2,456,933.6153
Long. of periastron (ω)
146.00°
Sky-projected obliquity (λ)
7.00°
Angular separation (arcsec)
0.34900
Eq. Temperature
992K
(719 °C)
Insolation (S⊕)
184.99
Earth = 1.00
Earth Similarity (ESI)
0.137
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
West et al. 2009Instrument
iKon-L CCD Camera
Publication
2009-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2008 at SuperWASP (5 shown).
Host System: WASP-11
Spectral Class
K-type orange
Effective Temperature
4,800 K — cooler than the Sun (5,778 K)
Estimated Age
7.60 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.890 R☉
Stellar Mass
1.420 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
2.800 g/cm³
Systemic radial velocity
4.91 km/s
Rotational v·sin i
1.04 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.992 mas
Total Proper Motion
44.991 mas/yr
PM Right Ascension
3.86 mas/yr
PM Declination
-44.83 mas/yr
Galactic Cartesian (pc)
x = 0.583 · y = 0.633 · z = 0.510
Equatorial (J2000)
RA 47.36895° · Dec 30.67338°
Galactic ℓ, b
155.018° · -23.463°
Ecliptic λ, β
53.366° · 12.494°
HTM-20 index
1781384296
Observation Record
Photometric series
5
RV measurements
3
Emission spectra
6
Archive notes
3
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