Key parameters at a glance

A radius of 12.82 Earth radii
A mass of 293.04 Earth masses
Surface gravity around 1.78 g
An orbital period of 2.963 days
Semi-major axis 0.0376 AU
Equilibrium temperature 1,171 K (898 °C)
Distance from Earth 918.92 light-years
Earth Similarity Index 0.118
Travel time at Voyager 1 speed 16,205,126 years

WASP-98 b Planet Profile

Physical Specs

Radius

12.82 R⊕

Radius (Jupiter)

1.144 R♃

Mass

293.04 M⊕

Mass (Jupiter)

0.922 M♃

Density

0.76 g/cm³

Surface Gravity

1.78 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.118

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

#1057of 1771

top 59.6%

This planet

12.82R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-432 b 12.83 R⊕ Qatar-1 b 12.81 R⊕ WASP-161 b 12.81 R⊕

Metric	Earth	WASP-98 b	Jupiter
Radius (R⊕)	1.00	12.82	11.21
Mass (M⊕)	1.00	293.04	317.83
Density (g/cm³)	5.51	0.76	1.33
Surface Gravity (g)	1.00	1.78	2.53
Insolation (S⊕)	1.00	269.88	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	293.039 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 166833457

Gaia DR2

Gaia DR2 4859136199796131200

Gaia DR3

Gaia DR3 4859136199796131200

System

WASP-98

Percentile among Gas Giant cohort

Radius 12.823 R⊕ · percentile 40 / cohort 1771

Mass 293.039 M⊕ · percentile 32 / cohort 1747

Orbital period 2.96 d · percentile 15 / cohort 1533

Distance 281.74 pc · percentile 58 / cohort 1759

ESI 0.118 · percentile 31 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.963 days

Semi-major axis

0.0376 AU

Eccentricity

0.000

Inclination

86.38 °

Year Length

A year here lasts approximately 2.96 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0376 AU.

Transit Fingerprint

Depth

2.570 %

Duration

1.908 h

Impact parameter b

0.710

Rp / R★

0.158240

Transit midpoint (BJD)

2,456,333.3921

Photometric dip

Transit produces a flux drop of 25,700 ppm lasting ≈ 1.91 h.

Extended Orbital Architecture

Planet / star radius ratio

0.158240

Semi-major axis / stellar radius

10.920

Impact parameter (b)

0.710

RV semi-amplitude (K)

150.000 m/s

Transit mid-time (BJD)

2,456,333.3921

Angular separation (arcsec)

0.13400

Eq. Temperature

1,171K

(898 °C)

Insolation (S⊕)

269.88

Earth = 1.00

Earth Similarity (ESI)

0.118

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-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 WASP-68 b · Gas Giant

Host System: WASP-98

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,473 K — cooler than the Sun (5,778 K)

Estimated Age

2.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.741 R☉

Stellar Mass

0.809 M☉

Metallicity [Fe/H]

-0.49

Extended Stellar Properties

Surface gravity (log g)

4.606 dex

Stellar density

2.801 g/cm³

Systemic radial velocity

-38.29 km/s

Rotational v·sin i

0.99 km/s

Metallicity ratio

[Fe/H]

Distance

281.74 parsec

Light-years 918.92 ly

V-band magnitude

13.25 mag

Voyager-speed travel 16,205,126 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.520 mas

Total Proper Motion

35.842 mas/yr

PM Right Ascension

33.63 mas/yr

PM Declination

-12.40 mas/yr

Galactic Cartesian (pc)

x = 0.432 · y = 0.704 · z = -0.564

Equatorial (J2000)

RA 58.42901° · Dec -34.32827°

Galactic ℓ, b

234.934° · -50.503°

Ecliptic λ, β

44.248° · -52.870°

HTM-20 index

1702471935