Key parameters at a glance
- A radius of 16.62 Earth radii
- A mass of 271.42 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 2.520 days
- Semi-major axis 0.0389 AU
- Equilibrium temperature 1,812 K (1539 °C)
- Distance from Earth 1,282.03 light-years
- Earth Similarity Index 0.058
- Travel time at Voyager 1 speed 22,608,561 years
WASP-1 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#127of 1771
top 7.1%
This planet
16.62R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-1 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.62 | 11.21 |
| Mass (M⊕) | 1.00 | 271.42 | 317.83 |
| Density (g/cm³) | 5.51 | 0.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,121.52 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 271.415 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 57984377
Gaia DR2
Gaia DR2 2862548428079638912
Gaia DR3
Gaia DR3 2862548428079638912
System
WASP-1
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.52 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0389 AU.
Transit Fingerprint
Depth
1.243 %
Duration
3.712 h
Impact parameter b
0.000
Rp / R★
0.103620
Transit midpoint (BJD)
2,453,912.5151
Photometric dip
Transit produces a flux drop of 12,429 ppm lasting ≈ 3.71 h.
Extended Orbital Architecture
Planet / star radius ratio
0.103620
Semi-major axis / stellar radius
5.687
Impact parameter (b)
0.000
RV semi-amplitude (K)
110.900 m/s
Transit mid-time (BJD)
2,453,912.5151
Long. of periastron (ω)
91.10°
Sky-projected obliquity (λ)
-79.00°
Angular separation (arcsec)
0.09890
Eq. Temperature
1,812K
(1539 °C)
Insolation (S⊕)
2,121.52
Earth = 1.00
Earth Similarity (ESI)
0.058
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
Collier Cameron et al. 2007Instrument
iKon-L CCD Camera
Publication
2007-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2007 at SuperWASP (3 shown).
Host System: WASP-1
Spectral Class
F-type yellow-white
Effective Temperature
6,110 K — hotter than the Sun (5,778 K)
Estimated Age
3.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.470 R☉
Stellar Mass
1.240 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.207 dex
Stellar density
0.548 g/cm³
Systemic radial velocity
-13.50 km/s
Rotational v·sin i
5.77 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.517 mas
Total Proper Motion
5.712 mas/yr
PM Right Ascension
-4.71 mas/yr
PM Declination
-3.24 mas/yr
Galactic Cartesian (pc)
x = 0.845 · y = 0.076 · z = 0.530
Equatorial (J2000)
RA 5.16695° · Dec 31.98997°
Galactic ℓ, b
115.366° · -30.429°
Ecliptic λ, β
18.385° · 27.108°
HTM-20 index
-140262940
Observation Record
Photometric series
19
RV measurements
3
Emission spectra
2
Archive notes
4
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