Key parameters at a glance

A radius of 14.91 Earth radii
A mass of 400.47 Earth masses
Surface gravity around 1.80 g
An orbital period of 2.849 days
Semi-major axis 0.0457 AU
Equilibrium temperature 2,190 K (1917 °C)
Distance from Earth 1,188.55 light-years
Earth Similarity Index 0.050
Travel time at Voyager 1 speed 20,960,049 years

WASP-100 b Planet Profile

Physical Specs

Radius

14.91 R⊕

Radius (Jupiter)

1.330 R♃

Mass

400.47 M⊕

Mass (Jupiter)

1.260 M♃

Density

0.53 g/cm³

Surface Gravity

1.80 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.050

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#237of 1771

top 13.3%

This planet

14.91R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-184 b 14.91 R⊕ NGTS-1 b 14.91 R⊕ WASP-7 b 14.91 R⊕

Metric	Earth	WASP-100 b	Jupiter
Radius (R⊕)	1.00	14.91	11.21
Mass (M⊕)	1.00	400.47	317.83
Density (g/cm³)	5.51	0.53	1.33
Surface Gravity (g)	1.00	1.80	2.53
Insolation (S⊕)	1.00	5,502.88	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	400.466 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 38846515

Gaia DR2

Gaia DR2 4675352109658261376

Gaia DR3

Gaia DR3 4675352109659600000

System

WASP-100

Percentile among Gas Giant cohort

Radius 14.908 R⊕ · percentile 86 / cohort 1771

Mass 400.466 M⊕ · percentile 42 / cohort 1747

Orbital period 2.85 d · percentile 14 / cohort 1533

Distance 364.41 pc · percentile 66 / cohort 1759

ESI 0.050 · percentile 4 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.849 days

Semi-major axis

0.0457 AU

Eccentricity

0.000

Inclination

82.60 °

Year Length

A year here lasts approximately 2.85 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0457 AU.

Transit Fingerprint

Depth

0.760 %

Duration

3.753 h

Impact parameter b

0.590

Rp / R★

0.080140

Transit midpoint (BJD)

2,458,853.8807

Photometric dip

Transit produces a flux drop of 7,600 ppm lasting ≈ 3.75 h.

Extended Orbital Architecture

Planet / star radius ratio

0.080140

Semi-major axis / stellar radius

4.930

Impact parameter (b)

0.590

RV semi-amplitude (K)

213.000 m/s

Transit mid-time (BJD)

2,458,853.8807

Sky-projected obliquity (λ)

79.00°

Angular separation (arcsec)

0.12600

Eq. Temperature

2,190K

(1917 °C)

Insolation (S⊕)

5,502.88

Earth = 1.00

Earth Similarity (ESI)

0.050

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

Hellier et al. 2014

Instrument

iKon-L CCD Camera

Publication

2014-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at SuperWASP (12 shown).

WASP-94 B b · Gas Giant WASP-84 b · Gas Giant WASP-106 b · Gas Giant WASP-117 b · Gas Giant WASP-69 b · Gas Giant WASP-98 b · Gas Giant WASP-99 b · Gas Giant WASP-104 b · Gas Giant WASP-96 b · Gas Giant WASP-97 b · Gas Giant WASP-70 A b · Gas Giant WASP-28 b · Gas Giant

Host System: WASP-100

Spectral Class

F-type yellow-white

Effective Temperature

6,900 K — hotter than the Sun (5,778 K)

Estimated Age

1.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.570 R☉

Stellar Mass

0.770 M☉

Metallicity [Fe/H]

-0.03

Extended Stellar Properties

Surface gravity (log g)

4.350 dex

Stellar density

0.280 g/cm³

Systemic radial velocity

29.97 km/s

Rotational v·sin i

12.80 km/s

Metallicity ratio

[Fe/H]

Distance

364.41 parsec

Light-years 1,188.55 ly

V-band magnitude

10.80 mag

Voyager-speed travel 20,960,049 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.715 mas

Total Proper Motion

10.857 mas/yr

PM Right Ascension

10.85 mas/yr

PM Declination

-0.50 mas/yr

Galactic Cartesian (pc)

x = 0.157 · y = 0.409 · z = -0.899

Equatorial (J2000)

RA 68.95982° · Dec -64.02704°

Galactic ℓ, b

275.107° · -38.853°

Ecliptic λ, β

6.317° · -80.898°

HTM-20 index

-496922572