Key parameters at a glance
- A radius of 15.28 Earth radii
- A mass of 355.97 Earth masses
- Surface gravity around 1.53 g
- An orbital period of 1.019 days
- Semi-major axis 0.0186 AU
- Equilibrium temperature 2,000 K (1727 °C)
- Distance from Earth 3,361.91 light-years
- Earth Similarity Index 0.057
- Travel time at Voyager 1 speed 59,287,329 years
- Almost certainly tidally locked to its host star given the close orbit
WTS-2 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#210of 1771
top 11.8%
This planet
15.28R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WTS-2 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.28 | 11.21 |
| Mass (M⊕) | 1.00 | 355.97 | 317.83 |
| Density (g/cm³) | 5.51 | 0.54 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.53 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,544.65 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 355.970 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 138359318
Gaia DR2
Gaia DR2 2048563889694771200
Gaia DR3
Gaia DR3 2048563889694771200
System
WTS-2
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.02 Earth days (0.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0186 AU.
Transit Fingerprint
Depth
9.156 %
Duration
1.495 h
Impact parameter b
0.584
Rp / R★
0.186300
Transit midpoint (BJD)
2,454,317.8133
Photometric dip
Transit produces a flux drop of 91,559 ppm lasting ≈ 1.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.186300
Impact parameter (b)
0.584
RV semi-amplitude (K)
256.000 m/s
Transit mid-time (BJD)
2,454,317.8133
Long. of periastron (ω)
293.00°
Angular separation (arcsec)
0.01800
Eq. Temperature
2,000K
(1727 °C)
Insolation (S⊕)
2,544.65
Earth = 1.00
Earth Similarity (ESI)
0.057
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Birkby et al. 2014Instrument
WFCam Wide Field Camera
Publication
2014-05
Observation locale
Ground
Host System: WTS-2
Spectral Class
K-type orange
Effective Temperature
5,000 K — cooler than the Sun (5,778 K)
Estimated Age
0.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.752 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
2.720 g/cm³
Systemic radial velocity
-20.03 km/s
Rotational v·sin i
2.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
0.970 mas
Total Proper Motion
0.964 mas/yr
PM Right Ascension
0.14 mas/yr
PM Declination
-0.95 mas/yr
Galactic Cartesian (pc)
x = 0.322 · y = -0.733 · z = 0.599
Equatorial (J2000)
RA 293.73278° · Dec 36.81549°
Galactic ℓ, b
70.382° · 7.981°
Ecliptic λ, β
306.585° · 57.279°
HTM-20 index
235292270
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