Key parameters at a glance
- A radius of 8.69 Earth radii
- A mass of 274.28 Earth masses
- Surface gravity around 3.63 g
- An orbital period of 7.920 days
- Semi-major axis 0.0697 AU
- Equilibrium temperature 670 K (397 °C)
- Distance from Earth 378.13 light-years
- Earth Similarity Index 0.279
- Travel time at Voyager 1 speed 6,668,361 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-59 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#106of 574
top 18.3%
This planet
8.69R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | WASP-59 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.69 | 11.21 |
| Mass (M⊕) | 1.00 | 274.28 | 317.83 |
| Density (g/cm³) | 5.51 | 2.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.63 | 2.53 |
| Insolation (S⊕) | 1.00 | 38.03 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 274.276 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 91051152
Gaia DR2
Gaia DR2 2841043011433969152
Gaia DR3
Gaia DR3 2841043011433969152
System
WASP-59
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.92 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0697 AU.
Transit Fingerprint
Depth
1.690 %
Duration
2.448 h
Impact parameter b
0.290
Rp / R★
0.130000
Transit midpoint (BJD)
2,455,830.9556
Photometric dip
Transit produces a flux drop of 16,900 ppm lasting ≈ 2.45 h.
Extended Orbital Architecture
Planet / star radius ratio
0.130000
Semi-major axis / stellar radius
24.390
Impact parameter (b)
0.290
RV semi-amplitude (K)
109.600 m/s
Transit mid-time (BJD)
2,455,830.9556
Long. of periastron (ω)
74.00°
Sky-projected obliquity (λ)
16.00°
Angular separation (arcsec)
0.60100
Eq. Temperature
670K
(397 °C)
Insolation (S⊕)
38.03
Earth = 1.00
Earth Similarity (ESI)
0.279
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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
Hebrard et al. 2013Instrument
iKon-L CCD Camera
Publication
2013-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2012 at SuperWASP (12 shown).
Host System: WASP-59
Spectral Class
K-type orange
Effective Temperature
4,650 K — cooler than the Sun (5,778 K)
Estimated Age
0.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.613 R☉
Stellar Mass
0.719 M☉
Metallicity [Fe/H]
-0.15
Extended Stellar Properties
Surface gravity (log g)
4.720 dex
Stellar density
4.380 g/cm³
Systemic radial velocity
-56.80 km/s
Rotational v·sin i
2.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
8.597 mas
Total Proper Motion
33.823 mas/yr
PM Right Ascension
-33.73 mas/yr
PM Declination
-2.52 mas/yr
Galactic Cartesian (pc)
x = 0.892 · y = -0.163 · z = 0.421
Equatorial (J2000)
RA 349.62295° · Dec 24.88928°
Galactic ℓ, b
97.560° · -33.362°
Ecliptic λ, β
1.120° · 26.816°
HTM-20 index
815946713
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