Key parameters at a glance

A radius of 9.38 Earth radii
A mass of 64.20 Earth masses
Surface gravity around 0.73 g
An orbital period of 7.630 days
Distance from Earth 706.21 light-years
Earth Similarity Index 0.319
Travel time at Voyager 1 speed 12,454,057 years

1 sibling around WASP-126

WASP-126 c 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	Gas Giant	10.51	90.30	3.289	1,480	2016
WASP-126 c this	Neptune-like	9.38	64.20	7.630	—	2019

WASP-126 c Planet Profile

Physical Specs

Radius

9.38 R⊕

Radius (Jupiter)

0.837 R♃

Mass

64.20 M⊕

Mass (Jupiter)

0.202 M♃

Density

0.43 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.319

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Transit Timing Variations

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#52of 574

top 8.9%

This planet

9.38R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-1898 b 9.40 R⊕ HD 10180 h 9.40 R⊕ HD 24040 c 9.35 R⊕

Metric	Earth	WASP-126 c	Jupiter
Radius (R⊕)	1.00	9.38	11.21
Mass (M⊕)	1.00	64.20	317.83
Density (g/cm³)	5.51	0.43	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	64.200 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 Neptune-like cohort

Radius 9.380 R⊕ · percentile 91 / cohort 574

Mass 64.200 M⊕ · percentile 82 / cohort 574

Orbital period 7.63 d · percentile 29 / cohort 524

Distance 216.53 pc · percentile 41 / cohort 572

ESI 0.319 · percentile 55 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

7.630 days

Semi-major axis

— AU

Eccentricity

0.050

Inclination

85.50 °

Year Length

A year here lasts approximately 7.63 Earth days (2.1% of a terrestrial year) on a nearly circular orbit.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.319

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Pearson 2019

Instrument

TESS CCD Array

Publication

2019-12

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

LP 791-18 c · Sub-Neptune LTT 1445 A b · Super-Earth TOI-270 d · Sub-Neptune L 98-59 d · Super-Earth GJ 357 b · Rocky Terrestrial GJ 143 b · Sub-Neptune HD 23472 c · Super-Earth L 98-59 c · Super-Earth LP 791-18 b · Rocky Terrestrial TOI-270 c · Sub-Neptune HD 23472 b · Sub-Neptune TOI-270 b · Super-Earth

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