Key parameters at a glance
- A radius of 12.75 Earth radii
- A mass of 404.26 Earth masses
- Surface gravity around 2.49 g
- An orbital period of 1.755 days
- Semi-major axis 0.0292 AU
- Equilibrium temperature 1,516 K (1243 °C)
- Distance from Earth 606.43 light-years
- Earth Similarity Index 0.093
- Travel time at Voyager 1 speed 10,694,364 years
WASP-104 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1124of 1771
top 63.4%
This planet
12.75R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-104 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.75 | 11.21 |
| Mass (M⊕) | 1.00 | 404.26 | 317.83 |
| Density (g/cm³) | 5.51 | 1.07 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.49 | 2.53 |
| Insolation (S⊕) | 1.00 | 867.74 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 404.263 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 393495970
Gaia DR2
Gaia DR2 3868603216762016256
Gaia DR3
Gaia DR3 3868603216762016256
System
WASP-104
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.76 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0292 AU.
Transit Fingerprint
Depth
1.474 %
Duration
1.762 h
Impact parameter b
0.724
Rp / R★
0.121400
Transit midpoint (BJD)
2,456,406.1113
Photometric dip
Transit produces a flux drop of 14,740 ppm lasting ≈ 1.76 h.
Extended Orbital Architecture
Planet / star radius ratio
0.121400
Semi-major axis / stellar radius
6.520
Impact parameter (b)
0.724
RV semi-amplitude (K)
202.700 m/s
Transit mid-time (BJD)
2,456,406.1113
Angular separation (arcsec)
0.15700
Eq. Temperature
1,516K
(1243 °C)
Insolation (S⊕)
867.74
Earth = 1.00
Earth Similarity (ESI)
0.093
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
Smith et al. 2014Instrument
iKon-L CCD Camera
Publication
2014-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2014 at SuperWASP (12 shown).
Host System: WASP-104
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,475 K — cooler than the Sun (5,778 K)
Estimated Age
3.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.963 R☉
Stellar Mass
1.076 M☉
Metallicity [Fe/H]
0.32
Extended Stellar Properties
Surface gravity (log g)
4.503 dex
Stellar density
1.700 g/cm³
Systemic radial velocity
28.55 km/s
Rotational v·sin i
0.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
5.350 mas
Total Proper Motion
32.191 mas/yr
PM Right Ascension
-32.17 mas/yr
PM Declination
-1.17 mas/yr
Galactic Cartesian (pc)
x = -0.935 · y = 0.329 · z = 0.129
Equatorial (J2000)
RA 160.60237° · Dec 7.43508°
Galactic ℓ, b
239.720° · 53.640°
Ecliptic λ, β
159.285° · -0.703°
HTM-20 index
-92638164
Similar Worlds
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Radius 12.77 R⊕ · 911.6 ly
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TOI-1820 b
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