Key parameters at a glance
- A radius of 15.80 Earth radii
- A mass of 171.63 Earth masses
- Surface gravity around 0.69 g
- An orbital period of 3.752 days
- Semi-major axis 0.0517 AU
- Equilibrium temperature 1,676 K (1403 °C)
- Distance from Earth 920.06 light-years
- Earth Similarity Index 0.061
- Travel time at Voyager 1 speed 16,225,199 years
WASP-15 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#174of 1771
top 9.8%
This planet
15.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-15 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.80 | 11.21 |
| Mass (M⊕) | 1.00 | 171.63 | 317.83 |
| Density (g/cm³) | 5.51 | 0.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.69 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,237.74 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 171.628 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 111991770
Gaia DR2
Gaia DR2 6171009049549197824
Gaia DR3
Gaia DR3 6171009049549197824
System
WASP-15
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.75 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0517 AU.
Transit Fingerprint
Depth
0.970 %
Duration
3.713 h
Impact parameter b
0.525
Rp / R★
0.098420
Transit midpoint (BJD)
2,456,036.7605
Photometric dip
Transit produces a flux drop of 9,700 ppm lasting ≈ 3.71 h.
Extended Orbital Architecture
Planet / star radius ratio
0.098420
Semi-major axis / stellar radius
7.290
Impact parameter (b)
0.525
RV semi-amplitude (K)
63.400 m/s
Transit mid-time (BJD)
2,456,036.7605
Long. of periastron (ω)
240.00°
Sky-projected obliquity (λ)
-139.60°
Angular separation (arcsec)
0.18300
Eq. Temperature
1,676K
(1403 °C)
Insolation (S⊕)
1,237.74
Earth = 1.00
Earth Similarity (ESI)
0.061
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
West et al. 2009Instrument
iKon-L CCD Camera
Publication
2009-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at SuperWASP (6 shown).
Host System: WASP-15
Spectral Class
F-type yellow-white
Effective Temperature
6,300 K — hotter than the Sun (5,778 K)
Estimated Age
2.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.480 R☉
Stellar Mass
1.180 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.350 dex
Stellar density
0.520 g/cm³
Systemic radial velocity
-2.34 km/s
Rotational v·sin i
4.27 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.517 mas
Total Proper Motion
24.047 mas/yr
PM Right Ascension
8.77 mas/yr
PM Declination
-22.39 mas/yr
Galactic Cartesian (pc)
x = -0.741 · y = -0.409 · z = -0.532
Equatorial (J2000)
RA 208.92801° · Dec -32.15971°
Galactic ℓ, b
318.437° · 28.770°
Ecliptic λ, β
218.404° · -18.994°
HTM-20 index
1095737268
Observation Record
Photometric series
2
RV measurements
1
Transmission spectra
4
Emission spectra
1
Similar Worlds
WASP-61 b
Gas Giant · F-type yellow-white
Radius 15.80 R⊕ · 1,593.8 ly
CoRoT-36 b
Gas Giant · F-type yellow-white
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HATS-66 b
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KELT-16 b
Gas Giant · F-type yellow-white
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Kepler-8 b
Gas Giant · F-type yellow-white
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Radius 15.69 R⊕ · 690.0 ly