Key parameters at a glance
- A radius of 17.15 Earth radii
- A mass of 266.98 Earth masses
- Surface gravity around 0.91 g
- An orbital period of 2.053 days
- Semi-major axis 0.0347 AU
- Equilibrium temperature 2,000 K (1727 °C)
- Distance from Earth 2,383.98 light-years
- Earth Similarity Index 0.050
- Travel time at Voyager 1 speed 42,041,517 years
WASP-142 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#103of 1771
top 5.8%
This planet
17.15R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-142 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 17.15 | 11.21 |
| Mass (M⊕) | 1.00 | 266.98 | 317.83 |
| Density (g/cm³) | 5.51 | 0.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.91 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,140.92 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 266.977 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 423275733
Gaia DR2
Gaia DR2 5674618444832114304
Gaia DR3
Gaia DR3 5674618444832114304
System
WASP-142
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.05 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0347 AU.
Transit Fingerprint
Depth
0.916 %
Duration
2.681 h
Impact parameter b
0.770
Rp / R★
0.095700
Transit midpoint (BJD)
2,457,007.7779
Photometric dip
Transit produces a flux drop of 9,160 ppm lasting ≈ 2.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.095700
Semi-major axis / stellar radius
4.524
Impact parameter (b)
0.770
RV semi-amplitude (K)
109.000 m/s
Transit mid-time (BJD)
2,457,007.7779
Angular separation (arcsec)
0.04750
Eq. Temperature
2,000K
(1727 °C)
Insolation (S⊕)
3,140.92
Earth = 1.00
Earth Similarity (ESI)
0.050
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
Hellier et al. 2017Instrument
iKon-L CCD Camera
Publication
2017-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at SuperWASP-South (11 shown).
Host System: WASP-142
Spectral Class
F-type yellow-white
Effective Temperature
6,010 K — hotter than the Sun (5,778 K)
Estimated Age
2.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.640 R☉
Stellar Mass
1.330 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.130 dex
Stellar density
0.420 g/cm³
Systemic radial velocity
47.13 km/s
Rotational v·sin i
3.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.340 mas
Total Proper Motion
21.947 mas/yr
PM Right Ascension
-15.83 mas/yr
PM Declination
15.20 mas/yr
Galactic Cartesian (pc)
x = -0.705 · y = 0.581 · z = -0.406
Equatorial (J2000)
RA 140.50632° · Dec -23.94610°
Galactic ℓ, b
253.327° · 18.164°
Ecliptic λ, β
152.197° · -37.128°
HTM-20 index
1803603080
Similar Worlds
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Gas Giant · F-type yellow-white
Radius 17.15 R⊕ · 804.6 ly
TOI-5592 b
Gas Giant · F-type yellow-white
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WASP-103 b
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TIC 257060897 b
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HAT-P-40 b
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TOI-1181 b
Gas Giant · F-type yellow-white
Radius 17.03 R⊕ · 987.7 ly