Key parameters at a glance
- A radius of 13.90 Earth radii
- A mass of 402.05 Earth masses
- Surface gravity around 2.08 g
- An orbital period of 2.656 days
- Semi-major axis 0.0390 AU
- Equilibrium temperature 1,452 K (1179 °C)
- Distance from Earth 462.77 light-years
- Earth Similarity Index 0.093
- Travel time at Voyager 1 speed 8,161,001 years
WASP-85 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#501of 1771
top 28.2%
This planet
13.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-85 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.90 | 11.21 |
| Mass (M⊕) | 1.00 | 402.05 | 317.83 |
| Density (g/cm³) | 5.51 | 0.88 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 640.33 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 402.055 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 380619414
Gaia DR2
Gaia DR2 3909745223886018432
Gaia DR3
Gaia DR3 3909745223886018432
System
WASP-85
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.66 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0390 AU.
Transit Fingerprint
Depth
1.870 %
Duration
2.596 h
Impact parameter b
0.047
Rp / R★
0.136814
Transit midpoint (BJD)
2,456,847.4729
Photometric dip
Transit produces a flux drop of 18,700 ppm lasting ≈ 2.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.136814
Semi-major axis / stellar radius
7.834
Impact parameter (b)
0.047
Transit mid-time (BJD)
2,456,847.4729
Sky-projected obliquity (λ)
14.00°
True obliquity (ψ)
41.00°
Angular separation (arcsec)
0.27500
Eq. Temperature
1,452K
(1179 °C)
Insolation (S⊕)
640.33
Earth = 1.00
Earth Similarity (ESI)
0.093
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — 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
Mo X10d Nik et al. 2016Instrument
Kepler CCD Array
Publication
2016-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: WASP-85 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,112 K — hotter than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.935 R☉
Stellar Mass
1.090 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.480 dex
Stellar density
1.875 g/cm³
Systemic radial velocity
14.01 km/s
Rotation period
15.10 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
7.020 mas
Total Proper Motion
78.021 mas/yr
PM Right Ascension
-77.24 mas/yr
PM Declination
11.02 mas/yr
Galactic Cartesian (pc)
x = -0.991 · y = 0.071 · z = 0.114
Equatorial (J2000)
RA 175.90803° · Dec 6.56378°
Galactic ℓ, b
261.793° · 63.879°
Ecliptic λ, β
173.633° · 4.398°
HTM-20 index
1977688271
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