Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,003.37 Earth masses
Surface gravity around 19.22 g
An orbital period of 4,323.000 days
Semi-major axis 5.2800 AU
Distance from Earth 293.41 light-years
Earth Similarity Index 0.391
Travel time at Voyager 1 speed 5,174,318 years

1 sibling around WASP-8

WASP-8 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-8 b	Gas Giant	12.67	807.29	8.159	1,059	2010
WASP-8 c this	Gas Giant	12.50	3,003.37	4,323.000	—	2013

WASP-8 c Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.120 R♃

Mass

3,003.37 M⊕

Mass (Jupiter)

9.450 M♃

Density

8.45 g/cm³

Surface Gravity

19.22 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.391

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	WASP-8 c	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,003.37	317.83
Density (g/cm³)	5.51	8.45	1.33
Surface Gravity (g)	1.00	19.22	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	3,003.370 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 183532609

Gaia DR2

Gaia DR2 2312679845530628096

Gaia DR3

Gaia DR3 2312679845530628096

System

WASP-8

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,003.370 M⊕ · percentile 87 / cohort 1747

Orbital period 4,323.00 d · percentile 91 / cohort 1533

Distance 89.96 pc · percentile 33 / cohort 1759

ESI 0.391 · percentile 83 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4,323.000 days

Semi-major axis

5.2800 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts about 11.84 Earth years on a nearly circular orbit at a mean orbital distance of 5.2800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.391

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Knutson et al. 2014

Instrument

iKon-L CCD Camera

Publication

2014-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at SuperWASP (2 shown).

WASP-65 b · Gas Giant WASP-75 b · Gas Giant

Host System: WASP-8

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,690 K — cooler than the Sun (5,778 K)

Estimated Age

3.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

1.740 g/cm³

Systemic radial velocity

-1.50 km/s

Rotational v·sin i

1.90 km/s

Metallicity ratio

[Fe/H]

Distance

89.96 parsec

Light-years 293.41 ly

V-band magnitude

9.79 mag

Voyager-speed travel 5,174,318 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.087 mas

Total Proper Motion

110.011 mas/yr

PM Right Ascension

109.75 mas/yr

PM Declination

7.61 mas/yr

Galactic Cartesian (pc)

x = 0.819 · y = -0.001 · z = -0.574

Equatorial (J2000)

RA 359.90087° · Dec -35.03133°

Galactic ℓ, b

354.251° · -76.395°

Ecliptic λ, β

344.331° · -31.742°

HTM-20 index

137568729