Key parameters at a glance
- A radius of 14.24 Earth radii
- A mass of 775.51 Earth masses
- Surface gravity around 3.83 g
- An orbital period of 2.236 days
- Semi-major axis 0.0323 AU
- Equilibrium temperature 1,270 K (997 °C)
- Distance from Earth 383.55 light-years
- Earth Similarity Index 0.117
- Travel time at Voyager 1 speed 6,763,956 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-140 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#330of 1771
top 18.6%
This planet
14.24R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-140 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.24 | 11.21 |
| Mass (M⊕) | 1.00 | 775.51 | 317.83 |
| Density (g/cm³) | 5.51 | 1.58 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.83 | 2.53 |
| Insolation (S⊕) | 1.00 | 491.33 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 775.505 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 178284730
Gaia DR2
Gaia DR2 5094154336330994688
Gaia DR3
Gaia DR3 5094154336332482304
System
WASP-140
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.24 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0323 AU.
Transit Fingerprint
Depth
1.906 %
Duration
1.525 h
Impact parameter b
0.851
Rp / R★
0.146400
Transit midpoint (BJD)
2,456,912.3526
Photometric dip
Transit produces a flux drop of 19,058 ppm lasting ≈ 1.53 h.
Extended Orbital Architecture
Planet / star radius ratio
0.146400
Semi-major axis / stellar radius
8.580
Impact parameter (b)
0.851
RV semi-amplitude (K)
403.000 m/s
Transit mid-time (BJD)
2,456,912.3526
Long. of periastron (ω)
356.00°
Angular separation (arcsec)
0.27500
Eq. Temperature
1,270K
(997 °C)
Insolation (S⊕)
491.33
Earth = 1.00
Earth Similarity (ESI)
0.117
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
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-140
Spectral Class
K-type orange
Effective Temperature
5,300 K — cooler than the Sun (5,778 K)
Estimated Age
0.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.870 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
1.940 g/cm³
Systemic radial velocity
2.13 km/s
Rotational v·sin i
3.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.475 mas
Total Proper Motion
27.559 mas/yr
PM Right Ascension
-18.67 mas/yr
PM Declination
20.28 mas/yr
Galactic Cartesian (pc)
x = 0.463 · y = 0.815 · z = -0.349
Equatorial (J2000)
RA 60.38554° · Dec -20.45100°
Galactic ℓ, b
214.794° · -46.254°
Ecliptic λ, β
52.722° · -40.135°
HTM-20 index
-1842049435
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