Key parameters at a glance
- A radius of 13.79 Earth radii
- A mass of 1,093.34 Earth masses
- Surface gravity around 5.75 g
- An orbital period of 6.872 days
- Semi-major axis 0.0752 AU
- Equilibrium temperature 1,250 K (977 °C)
- Distance from Earth 444.35 light-years
- Earth Similarity Index 0.125
- Travel time at Voyager 1 speed 7,836,199 years
WASP-38 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#540of 1771
top 30.4%
This planet
13.79R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-38 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.79 | 11.21 |
| Mass (M⊕) | 1.00 | 1,093.34 | 317.83 |
| Density (g/cm³) | 5.51 | 2.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.75 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,093.335 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 146389
TIC
TIC 318696424
Gaia DR2
Gaia DR2 4453211899986180352
Gaia DR3
Gaia DR3 4453211899986180352
System
WASP-38
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.87 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0752 AU.
Transit Fingerprint
Depth
0.690 %
Duration
4.807 h
Impact parameter b
0.350
Rp / R★
0.079600
Transit midpoint (BJD)
2,459,005.5124
Photometric dip
Transit produces a flux drop of 6,900 ppm lasting ≈ 4.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.079600
Semi-major axis / stellar radius
12.110
Impact parameter (b)
0.350
RV semi-amplitude (K)
252.000 m/s
Transit mid-time (BJD)
2,459,005.5124
Long. of periastron (ω)
-22.20°
Sky-projected obliquity (λ)
7.50°
Angular separation (arcsec)
0.55200
Eq. Temperature
1,250K
(977 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.125
0 = alien, 1 = Earth-identical
Insufficient insolation data — 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
Barros et al. 2010Instrument
iKon-L CCD Camera
Publication
2011-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at SuperWASP (12 shown).
Host System: WASP-38
Spectral Class
F-type yellow-white
Effective Temperature
6,180 K — hotter than the Sun (5,778 K)
Estimated Age
3.29 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.520 R☉
Stellar Mass
1.760 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.250 dex
Stellar density
0.710 g/cm³
Systemic radial velocity
-9.06 km/s
Rotational v·sin i
7.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.311 mas
Total Proper Motion
49.999 mas/yr
PM Right Ascension
-31.07 mas/yr
PM Declination
-39.17 mas/yr
Galactic Cartesian (pc)
x = -0.432 · y = -0.885 · z = 0.174
Equatorial (J2000)
RA 243.95972° · Dec 10.03241°
Galactic ℓ, b
23.528° · 39.033°
Ecliptic λ, β
239.786° · 30.781°
HTM-20 index
429010222
Observation Record
RV measurements
1
Emission spectra
1
Archive notes
1
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