Key parameters at a glance
- A radius of 10.42 Earth radii
- A mass of 565.71 Earth masses
- Surface gravity around 5.21 g
- An orbital period of 0.813 days
- Semi-major axis 0.0142 AU
- Equilibrium temperature 1,427 K (1154 °C)
- Distance from Earth 282.93 light-years
- Earth Similarity Index 0.120
- Travel time at Voyager 1 speed 4,989,463 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-43 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1736of 1771
top 98.0%
This planet
10.42R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-43 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.42 | 11.21 |
| Mass (M⊕) | 1.00 | 565.71 | 317.83 |
| Density (g/cm³) | 5.51 | 2.94 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 680.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 565.714 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 36734222
Gaia DR2
Gaia DR2 3767805209112436736
Gaia DR3
Gaia DR3 3767805209112436736
System
WASP-43
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 19.5 hours long on a nearly circular orbit at a mean orbital distance of 0.0142 AU.
Transit Fingerprint
Depth
2.550 %
Duration
1.159 h
Impact parameter b
0.698
Rp / R★
0.159400
Transit midpoint (BJD)
2,455,528.8677
Photometric dip
Transit produces a flux drop of 25,500 ppm lasting ≈ 1.16 h.
Extended Orbital Architecture
Planet / star radius ratio
0.159400
Semi-major axis / stellar radius
4.860
Impact parameter (b)
0.698
RV semi-amplitude (K)
551.000 m/s
Transit mid-time (BJD)
2,455,528.8677
Long. of periastron (ω)
90.00°
Sky-projected obliquity (λ)
3.50°
True obliquity (ψ)
20.00°
Angular separation (arcsec)
0.16400
Eq. Temperature
1,427K
(1154 °C)
Insolation (S⊕)
680.90
Earth = 1.00
Earth Similarity (ESI)
0.120
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Hellier et al. 2011Instrument
iKon-L CCD Camera
Publication
2011-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at SuperWASP (8 shown).
Host System: WASP-43
Spectral Class
K-type orange
Effective Temperature
4,400 K — cooler than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.600 R☉
Stellar Mass
0.580 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.650 dex
Stellar density
2.526 g/cm³
Systemic radial velocity
-3.59 km/s
Rotational v·sin i
4.00 km/s
Rotation period
15.60 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
11.499 mas
Total Proper Motion
56.801 mas/yr
PM Right Ascension
-42.04 mas/yr
PM Declination
-38.19 mas/yr
Galactic Cartesian (pc)
x = -0.892 · y = 0.418 · z = -0.170
Equatorial (J2000)
RA 154.90819° · Dec -9.80644°
Galactic ℓ, b
252.787° · 37.870°
Ecliptic λ, β
160.517° · -18.813°
HTM-20 index
1028205313
Observation Record
RV measurements
1
Transmission spectra
12
Emission spectra
23
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