Key parameters at a glance
- A radius of 12.04 Earth radii
- A mass of 677.61 Earth masses
- Surface gravity around 4.68 g
- An orbital period of 3.310 days
- Semi-major axis 0.0410 AU
- Equilibrium temperature 1,053 K (780 °C)
- Distance from Earth 656.68 light-years
- Earth Similarity Index 0.158
- Travel time at Voyager 1 speed 11,580,480 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around WASP-53
WASP-53 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| WASP-53 b this | Gas Giant | 12.04 | 677.61 | 3.310 | 1,053 | 2017 |
| WASP-53 c | Unclassified | — | 5,196.52 | 2,840.000 | — | 2017 |
WASP-53 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1490of 1771
top 84.1%
This planet
12.04R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-53 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.04 | 11.21 |
| Mass (M⊕) | 1.00 | 677.61 | 317.83 |
| Density (g/cm³) | 5.51 | 2.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.68 | 2.53 |
| Insolation (S⊕) | 1.00 | 241.67 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 677.614 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 268766053
Gaia DR2
Gaia DR2 5136559128264765184
Gaia DR3
Gaia DR3 5136559128264765184
System
WASP-53
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.31 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0410 AU.
Transit Fingerprint
Depth
1.916 %
Duration
2.268 h
Rp / R★
0.135300
Transit midpoint (BJD)
2,455,943.5670
Photometric dip
Transit produces a flux drop of 19,159 ppm lasting ≈ 2.27 h.
Extended Orbital Architecture
Planet / star radius ratio
0.135300
Semi-major axis / stellar radius
11.050
RV semi-amplitude (K)
326.100 m/s
Transit mid-time (BJD)
2,455,943.5670
Sky-projected obliquity (λ)
4.00°
Angular separation (arcsec)
0.20400
Eq. Temperature
1,053K
(780 °C)
Insolation (S⊕)
241.67
Earth = 1.00
Earth Similarity (ESI)
0.158
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
Triaud et al. 2017Instrument
Multiple Instruments
Publication
2017-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at Multiple Facilities (4 shown).
Host System: WASP-53
Spectral Class
K-type orange
Effective Temperature
4,953 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.798 R☉
Stellar Mass
0.839 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.553 dex
Stellar density
2.323 g/cm³
Systemic radial velocity
-3.03 km/s
Rotational v·sin i
0.86 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.938 mas
Total Proper Motion
12.227 mas/yr
PM Right Ascension
-9.08 mas/yr
PM Declination
8.19 mas/yr
Galactic Cartesian (pc)
x = 0.794 · y = 0.495 · z = -0.353
Equatorial (J2000)
RA 31.90916° · Dec -20.66184°
Galactic ℓ, b
196.640° · -71.448°
Ecliptic λ, β
21.529° · -31.364°
HTM-20 index
-1325311305
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