Key parameters at a glance

A radius of 10.51 Earth radii
A mass of 90.30 Earth masses
Surface gravity around 0.82 g
An orbital period of 3.289 days
Semi-major axis 0.0449 AU
Equilibrium temperature 1,480 K (1207 °C)
Distance from Earth 706.21 light-years
Earth Similarity Index 0.085
Travel time at Voyager 1 speed 12,454,057 years

1 sibling around WASP-126

WASP-126 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
WASP-126 b this	Gas Giant	10.51	90.30	3.289	1,480	2016
WASP-126 c	Neptune-like	9.38	64.20	7.630	—	2019

WASP-126 b Planet Profile

Physical Specs

Radius

10.51 R⊕

Radius (Jupiter)

0.938 R♃

Mass

90.30 M⊕

Mass (Jupiter)

0.284 M♃

Density

0.41 g/cm³

Surface Gravity

0.82 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.085

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility SuperWASP-South

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#1730of 1771

top 97.6%

This planet

10.51R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-1199 b 10.51 R⊕ TOI-7510 d 10.52 R⊕ TOI-6041 c 10.50 R⊕

Metric	Earth	WASP-126 b	Jupiter
Radius (R⊕)	1.00	10.51	11.21
Mass (M⊕)	1.00	90.30	317.83
Density (g/cm³)	5.51	0.41	1.33
Surface Gravity (g)	1.00	0.82	2.53
Insolation (S⊕)	1.00	759.34	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	90.300 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 25155310

Gaia DR2

Gaia DR2 4666498154837086208

Gaia DR3

Gaia DR3 4666498154837086208

System

WASP-126

Percentile among Gas Giant cohort

Radius 10.514 R⊕ · percentile 2 / cohort 1771

Mass 90.300 M⊕ · percentile 5 / cohort 1747

Orbital period 3.29 d · percentile 20 / cohort 1533

Distance 216.53 pc · percentile 52 / cohort 1759

ESI 0.085 · percentile 20 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.289 days

Semi-major axis

0.0449 AU

Eccentricity

0.180

Inclination

89.51 °

Year Length

A year here lasts approximately 3.29 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0449 AU.

Transit Fingerprint

Depth

0.701 %

Duration

3.437 h

Impact parameter b

0.300

Rp / R★

0.078000

Transit midpoint (BJD)

2,458,827.4162

Photometric dip

Transit produces a flux drop of 7,006 ppm lasting ≈ 3.44 h.

Extended Orbital Architecture

Planet / star radius ratio

0.078000

Semi-major axis / stellar radius

7.887

Impact parameter (b)

0.300

RV semi-amplitude (K)

36.000 m/s

Transit mid-time (BJD)

2,458,827.4162

Angular separation (arcsec)

0.20700

Eq. Temperature

1,480K

(1207 °C)

Insolation (S⊕)

759.34

Earth = 1.00

Earth Similarity (ESI)

0.085

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.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Maxted et al. 2016

Instrument

iKon-L CCD Camera

Publication

2016-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at SuperWASP-South (11 shown).

WASP-132 b · Gas Giant WASP-130 b · Neptune-like WASP-129 b · Gas Giant WASP-139 b · Neptune-like WASP-140 b · Gas Giant WASP-141 b · Gas Giant WASP-124 b · Gas Giant WASP-119 b · Gas Giant WASP-133 b · Gas Giant WASP-131 b · Gas Giant WASP-142 b · Gas Giant

Host System: WASP-126

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,800 K — hotter than the Sun (5,778 K)

Estimated Age

6.40 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.270 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.280 dex

Stellar density

0.790 g/cm³

Systemic radial velocity

29.16 km/s

Rotational v·sin i

0.50 km/s

Metallicity ratio

[M/H]

Distance

216.53 parsec

Light-years 706.21 ly

V-band magnitude

10.99 mag

Voyager-speed travel 12,454,057 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.590 mas

Total Proper Motion

82.710 mas/yr

PM Right Ascension

63.13 mas/yr

PM Declination

53.43 mas/yr

Galactic Cartesian (pc)

x = 0.159 · y = 0.317 · z = -0.935

Equatorial (J2000)

RA 63.37471° · Dec -69.22659°

Galactic ℓ, b

282.359° · -38.833°

Ecliptic λ, β

332.987° · -79.723°

HTM-20 index

395632015