Key parameters at a glance
- A radius of 10.98 Earth radii
- A mass of 344.53 Earth masses
- Surface gravity around 2.86 g
- An orbital period of 3.819 days
- Semi-major axis 0.0504 AU
- Equilibrium temperature 1,642 K (1369 °C)
- Distance from Earth 2,471.74 light-years
- Earth Similarity Index 0.093
- Travel time at Voyager 1 speed 43,589,144 years
WASP-171 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1665of 1771
top 94.0%
This planet
10.98R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-171 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.98 | 11.21 |
| Mass (M⊕) | 1.00 | 344.53 | 317.83 |
| Density (g/cm³) | 5.51 | 1.50 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.86 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,200.24 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 344.528 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 162922904
Gaia DR2
Gaia DR2 5376137837173646208
Gaia DR3
Gaia DR3 5376137837173646208
System
WASP-171
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.82 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0504 AU.
Transit Fingerprint
Depth
0.382 %
Duration
4.579 h
Impact parameter b
0.190
Transit midpoint (BJD)
2,458,059.8295
Photometric dip
Transit produces a flux drop of 3,820 ppm lasting ≈ 4.58 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
6.640
Impact parameter (b)
0.190
RV semi-amplitude (K)
126.000 m/s
Transit mid-time (BJD)
2,458,059.8295
Angular separation (arcsec)
0.06650
Eq. Temperature
1,642K
(1369 °C)
Insolation (S⊕)
1,200.24
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
Nielsen et al. 2019Instrument
iKon-L CCD Camera
Publication
2019-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at WASP-South (9 shown).
Host System: WASP-171
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,965 K — hotter than the Sun (5,778 K)
Estimated Age
5.91 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.637 R☉
Stellar Mass
1.171 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.080 dex
Stellar density
0.381 g/cm³
Systemic radial velocity
10.48 km/s
Rotational v·sin i
6.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.291 mas
Total Proper Motion
8.725 mas/yr
PM Right Ascension
-8.43 mas/yr
PM Declination
-2.26 mas/yr
Galactic Cartesian (pc)
x = -0.711 · y = 0.102 · z = -0.696
Equatorial (J2000)
RA 171.84505° · Dec -44.08870°
Galactic ℓ, b
287.371° · 16.229°
Ecliptic λ, β
194.451° · -42.757°
HTM-20 index
1393834002
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