Key parameters at a glance
- A radius of 10.78 Earth radii
- A mass of 280.95 Earth masses
- Surface gravity around 2.42 g
- An orbital period of 2.944 days
- Semi-major axis 0.0376 AU
- Equilibrium temperature 1,077 K (803 °C)
- Distance from Earth 676.74 light-years
- Earth Similarity Index 0.145
- Travel time at Voyager 1 speed 11,934,328 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-23 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1690of 1771
top 95.4%
This planet
10.78R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-23 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.78 | 11.21 |
| Mass (M⊕) | 1.00 | 280.95 | 317.83 |
| Density (g/cm³) | 5.51 | 1.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.42 | 2.53 |
| Insolation (S⊕) | 1.00 | 317.43 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 280.950 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 170102285
Gaia DR2
Gaia DR2 5557345496687437696
Gaia DR3
Gaia DR3 5557345496687437696
System
WASP-23
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.94 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0376 AU.
Transit Fingerprint
Depth
1.691 %
Duration
2.394 h
Rp / R★
0.130000
Transit midpoint (BJD)
2,455,320.1236
Photometric dip
Transit produces a flux drop of 16,910 ppm lasting ≈ 2.39 h.
Extended Orbital Architecture
Planet / star radius ratio
0.130000
Semi-major axis / stellar radius
10.210
RV semi-amplitude (K)
147.400 m/s
Transit mid-time (BJD)
2,455,320.1236
Angular separation (arcsec)
0.18100
Eq. Temperature
1,077K
(803 °C)
Insolation (S⊕)
317.43
Earth = 1.00
Earth Similarity (ESI)
0.145
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. 2011Instrument
iKon-L CCD Camera
Publication
2011-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at SuperWASP (12 shown).
Host System: WASP-23
Spectral Class
K-type orange
Effective Temperature
5,150 K — cooler than the Sun (5,778 K)
Estimated Age
6.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.765 R☉
Stellar Mass
0.780 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
1.840 g/cm³
Systemic radial velocity
5.83 km/s
Rotational v·sin i
2.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.791 mas
Total Proper Motion
88.233 mas/yr
PM Right Ascension
-9.01 mas/yr
PM Declination
-87.77 mas/yr
Galactic Cartesian (pc)
x = -0.142 · y = 0.720 · z = -0.679
Equatorial (J2000)
RA 101.12750° · Dec -42.76223°
Galactic ℓ, b
251.927° · -19.229°
Ecliptic λ, β
109.922° · -65.434°
HTM-20 index
1767329303
Similar Worlds
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IRAS 04125+2902 b
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