Key parameters at a glance

A radius of 15.48 Earth radii
A mass of 373.13 Earth masses
Surface gravity around 1.56 g
An orbital period of 3.183 days
Semi-major axis 0.0470 AU
Equilibrium temperature 1,693 K (1420 °C)
Distance from Earth 1,555.21 light-years
Earth Similarity Index 0.069
Travel time at Voyager 1 speed 27,426,178 years

WASP-194 b Planet Profile

Physical Specs

Radius

15.48 R⊕

Radius (Jupiter)

1.381 R♃

Mass

373.13 M⊕

Mass (Jupiter)

1.174 M♃

Density

0.55 g/cm³

Surface Gravity

1.56 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.069

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#200of 1771

top 11.2%

This planet

15.48R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HATS-3 b 15.48 R⊕ WASP-14 b 15.47 R⊕ WASP-159 b 15.47 R⊕

Metric	Earth	WASP-194 b	Jupiter
Radius (R⊕)	1.00	15.48	11.21
Mass (M⊕)	1.00	373.13	317.83
Density (g/cm³)	5.51	0.55	1.33
Surface Gravity (g)	1.00	1.56	2.53
Insolation (S⊕)	1.00	1,365.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	373.131 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 400432230

Gaia DR2

Gaia DR2 2139082524468869248

Gaia DR3

Gaia DR3 2139082524468869248

System

WASP-194

Percentile among Gas Giant cohort

Radius 15.480 R⊕ · percentile 89 / cohort 1771

Mass 373.131 M⊕ · percentile 40 / cohort 1747

Orbital period 3.18 d · percentile 18 / cohort 1533

Distance 476.83 pc · percentile 74 / cohort 1759

ESI 0.069 · percentile 13 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.183 days

Semi-major axis

0.0470 AU

Eccentricity

0.000

Inclination

83.23 °

Year Length

A year here lasts approximately 3.18 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0470 AU.

Transit Fingerprint

Depth

1.014 %

Duration

2.017 h

Impact parameter b

0.840

Rp / R★

0.100700

Transit midpoint (BJD)

2,457,449.0511

Photometric dip

Transit produces a flux drop of 10,143 ppm lasting ≈ 2.02 h.

Extended Orbital Architecture

Planet / star radius ratio

0.100700

Semi-major axis / stellar radius

7.150

Impact parameter (b)

0.840

RV semi-amplitude (K)

135.900 m/s

Transit mid-time (BJD)

2,457,449.0511

Angular separation (arcsec)

0.09860

Eq. Temperature

1,693K

(1420 °C)

Insolation (S⊕)

1,365.00

Earth = 1.00

Earth Similarity (ESI)

0.069

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

Schanche et al. 2025

Instrument

e2v CCD Camera

Publication

2025-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at SuperWASP (8 shown).

WASP-154 b · Gas Giant WASP-155 b · Gas Giant WASP-116 b · Gas Giant WASP-188 b · Gas Giant WASP-197 b · Gas Giant WASP-195 b · Gas Giant WASP-102 b · Gas Giant WASP-149 b · Gas Giant

Host System: WASP-194

Spectral Class

F-type yellow-white

Effective Temperature

6,405 K — hotter than the Sun (5,778 K)

Estimated Age

0.75 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.409 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.270 dex

Stellar density

0.683 g/cm³

Metallicity ratio

[Fe/H]

Distance

476.83 parsec

Light-years 1,555.21 ly

V-band magnitude

11.99 mag

Voyager-speed travel 27,426,178 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.068 mas

Total Proper Motion

15.541 mas/yr

PM Right Ascension

-4.61 mas/yr

PM Declination

-14.84 mas/yr

Galactic Cartesian (pc)

x = 0.238 · y = -0.502 · z = 0.831

Equatorial (J2000)

RA 295.38771° · Dec 56.21780°

Galactic ℓ, b

88.599° · 15.762°

Ecliptic λ, β

331.342° · 74.236°

HTM-20 index

-1512435792