Key parameters at a glance

A radius of 10.54 Earth radii
A mass of 30.51 Earth masses
Surface gravity around 0.27 g
An orbital period of 5.721 days
Semi-major axis 0.0550 AU
Equilibrium temperature 736 K (463 °C)
Distance from Earth 211.16 light-years
Earth Similarity Index 0.147
Travel time at Voyager 1 speed 3,723,770 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around WASP-107

WASP-107 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-107 b this	Gas Giant	10.54	30.51	5.721	736	2017
WASP-107 c	Gas Giant	13.00	111.24	1,066.000	—	2020

WASP-107 b Planet Profile

Physical Specs

Radius

10.54 R⊕

Radius (Jupiter)

0.940 R♃

Mass

30.51 M⊕

Mass (Jupiter)

0.096 M♃

Density

0.13 g/cm³

Surface Gravity

0.27 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.147

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility SuperWASP-South

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#1724of 1771

top 97.3%

This planet

10.54R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-56 b 10.54 R⊕ HAT-P-3 b 10.54 R⊕ TOI-4582 b 10.54 R⊕

Metric	Earth	WASP-107 b	Jupiter
Radius (R⊕)	1.00	10.54	11.21
Mass (M⊕)	1.00	30.51	317.83
Density (g/cm³)	5.51	0.13	1.33
Surface Gravity (g)	1.00	0.27	2.53
Insolation (S⊕)	1.00	51.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	30.512 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 429302040

Gaia DR2

Gaia DR2 3578638842054261248

Gaia DR3

Gaia DR3 3578638842054261248

System

WASP-107

Percentile among Gas Giant cohort

Radius 10.536 R⊕ · percentile 3 / cohort 1771

Mass 30.512 M⊕ · percentile 0 / cohort 1747

Orbital period 5.72 d · percentile 39 / cohort 1533

Distance 64.74 pc · percentile 27 / cohort 1759

ESI 0.147 · percentile 36 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5.721 days

Semi-major axis

0.0550 AU

Eccentricity

0.090

Inclination

89.55 °

Year Length

A year here lasts approximately 5.72 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0550 AU.

Transit Fingerprint

Depth

2.555 %

Duration

2.739 h

Impact parameter b

0.139

Rp / R★

0.143700

Transit midpoint (BJD)

2,459,958.7473

Photometric dip

Transit produces a flux drop of 25,549 ppm lasting ≈ 2.74 h.

Extended Orbital Architecture

Planet / star radius ratio

0.143700

Semi-major axis / stellar radius

16.500

Impact parameter (b)

0.139

RV semi-amplitude (K)

14.000 m/s

Transit mid-time (BJD)

2,459,958.7473

Long. of periastron (ω)

79.30°

Sky-projected obliquity (λ)

-158.00°

True obliquity (ψ)

103.50°

Angular separation (arcsec)

0.85000

Eq. Temperature

736K

(463 °C)

Insolation (S⊕)

51.00

Earth = 1.00

Earth Similarity (ESI)

0.147

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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

Anderson et al. 2017

Instrument

iKon-L CCD Camera

Publication

2017-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at SuperWASP-South (3 shown).

WASP-105 b · Gas Giant WASP-91 b · Gas Giant WASP-151 b · Gas Giant

Host System: WASP-107

Spectral Class

K-type orange

Effective Temperature

4,425 K — cooler than the Sun (5,778 K)

Estimated Age

3.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.657 R☉

Stellar Mass

0.683 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.633 dex

Stellar density

3.441 g/cm³

Systemic radial velocity

14.16 km/s

Rotational v·sin i

0.51 km/s

Rotation period

17.10 days

Metallicity ratio

[Fe/H]

Distance

64.74 parsec

Light-years 211.16 ly

V-band magnitude

11.59 mag

Voyager-speed travel 3,723,770 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

15.418 mas

Total Proper Motion

97.111 mas/yr

PM Right Ascension

-96.65 mas/yr

PM Declination

-9.48 mas/yr

Galactic Cartesian (pc)

x = -0.974 · y = -0.144 · z = -0.176

Equatorial (J2000)

RA 188.38643° · Dec -10.14621°

Galactic ℓ, b

295.691° · 52.474°

Ecliptic λ, β

191.703° · -5.999°

HTM-20 index

-1336049908

Observation Record

Transmission spectra

Emission spectra

Archive notes

Similar Worlds

HAT-P-3 b

Gas Giant · K-type orange

Radius 10.54 R⊕ · 438.9 ly

TOI-4582 b

Gas Giant · K-type orange

Radius 10.54 R⊕ · 1,251.9 ly

POTS-1 b

Gas Giant · K-type orange

Radius 10.55 R⊕ · 2,439.5 ly

K2-419 A b

Gas Giant · K-type orange

Radius 10.55 R⊕ · 876.3 ly

TOI-3486 b

Gas Giant · K-type orange

Radius 10.57 R⊕ · 504.6 ly

HAT-P-54 b

Gas Giant · K-type orange

Radius 10.58 R⊕ · 468.5 ly

Explore Related Categories

Gas Giant Planets Transit Discoveries SuperWASP-South Mission K-type orange Hosts