Key parameters at a glance

A radius of 13.27 Earth radii
A mass of 95.03 Earth masses
Surface gravity around 0.54 g
An orbital period of 4.520 days
Semi-major axis 0.0543 AU
Equilibrium temperature 1,186 K (913 °C)
Distance from Earth 1,426.92 light-years
Earth Similarity Index 0.094
Travel time at Voyager 1 speed 25,163,666 years

WASP-181 b Planet Profile

Physical Specs

Radius

13.27 R⊕

Radius (Jupiter)

1.184 R♃

Mass

95.03 M⊕

Mass (Jupiter)

0.299 M♃

Density

0.24 g/cm³

Surface Gravity

0.54 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.094

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#842of 1771

top 47.5%

This planet

13.27R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-4463 A b 13.26 R⊕ TIC 241249530 b 13.29 R⊕ HD 12661 b 13.30 R⊕

Metric	Earth	WASP-181 b	Jupiter
Radius (R⊕)	1.00	13.27	11.21
Mass (M⊕)	1.00	95.03	317.83
Density (g/cm³)	5.51	0.24	1.33
Surface Gravity (g)	1.00	0.54	2.53
Insolation (S⊕)	1.00	382.45	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	95.031 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 293457754

Gaia DR2

Gaia DR2 2512413932376364288

Gaia DR3

Gaia DR3 2512413932376364288

System

WASP-181

Percentile among Gas Giant cohort

Radius 13.271 R⊕ · percentile 52 / cohort 1771

Mass 95.031 M⊕ · percentile 5 / cohort 1747

Orbital period 4.52 d · percentile 33 / cohort 1533

Distance 437.50 pc · percentile 72 / cohort 1759

ESI 0.094 · percentile 25 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.520 days

Semi-major axis

0.0543 AU

Eccentricity

—

Inclination

88.38 °

Year Length

A year here lasts approximately 4.52 Earth days (1.2% of a terrestrial year) at a mean orbital distance of 0.0543 AU.

Transit Fingerprint

Depth

1.590 %

Duration

3.065 h

Impact parameter b

0.340

Rp / R★

0.126100

Transit midpoint (BJD)

2,457,747.6668

Photometric dip

Transit produces a flux drop of 15,900 ppm lasting ≈ 3.06 h.

Extended Orbital Architecture

Planet / star radius ratio

0.126100

Semi-major axis / stellar radius

12.090

Impact parameter (b)

0.340

RV semi-amplitude (K)

35.700 m/s

Transit mid-time (BJD)

2,457,747.6668

Angular separation (arcsec)

0.12400

Eq. Temperature

1,186K

(913 °C)

Insolation (S⊕)

382.45

Earth = 1.00

Earth Similarity (ESI)

0.094

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

Turner et al. 2019

Instrument

iKon-L CCD Camera

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at SuperWASP (3 shown).

WASP-183 b · Gas Giant WASP-177 b · Gas Giant WASP-180 A b · Gas Giant

Host System: WASP-181

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,839 K — hotter than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.965 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.487 dex

Stellar density

1.640 g/cm³

Systemic radial velocity

-8.55 km/s

Rotational v·sin i

3.30 km/s

Metallicity ratio

[Fe/H]

Distance

437.50 parsec

Light-years 1,426.92 ly

V-band magnitude

12.92 mag

Voyager-speed travel 25,163,666 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.257 mas

Total Proper Motion

22.611 mas/yr

PM Right Ascension

-5.34 mas/yr

PM Declination

-21.97 mas/yr

Galactic Cartesian (pc)

x = 0.891 · y = 0.450 · z = 0.055

Equatorial (J2000)

RA 26.79323° · Dec 3.13293°

Galactic ℓ, b

149.044° · -56.886°

Ecliptic λ, β

25.995° · -7.406°

HTM-20 index

-948664403