Key parameters at a glance

A radius of 18.16 Earth radii
A mass of 371.86 Earth masses
Surface gravity around 1.13 g
An orbital period of 2.706 days
Semi-major axis 0.0447 AU
Equilibrium temperature 2,190 K (1917 °C)
Distance from Earth 899.09 light-years
Earth Similarity Index 0.045
Travel time at Voyager 1 speed 15,855,534 years

WASP-82 b Planet Profile

Physical Specs

Radius

18.16 R⊕

Radius (Jupiter)

1.620 R♃

Mass

371.86 M⊕

Mass (Jupiter)

1.170 M♃

Density

0.35 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.045

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#64of 1771

top 3.6%

This planet

18.16R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

KELT-8 b 18.16 R⊕ WASP-189 b 18.15 R⊕ Kepler-7 b 18.18 R⊕

Metric	Earth	WASP-82 b	Jupiter
Radius (R⊕)	1.00	18.16	11.21
Mass (M⊕)	1.00	371.86	317.83
Density (g/cm³)	5.51	0.35	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	3,557.29	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	371.861 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 452808876

Gaia DR2

Gaia DR2 3231856379348299008

Gaia DR3

Gaia DR3 3231856379348299008

System

WASP-82

Percentile among Gas Giant cohort

Radius 18.159 R⊕ · percentile 96 / cohort 1771

Mass 371.861 M⊕ · percentile 39 / cohort 1747

Orbital period 2.71 d · percentile 12 / cohort 1533

Distance 275.66 pc · percentile 58 / cohort 1759

ESI 0.045 · percentile 3 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.706 days

Semi-major axis

0.0447 AU

Eccentricity

0.000

Inclination

87.90 °

Year Length

A year here lasts approximately 2.71 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0447 AU.

Transit Fingerprint

Depth

0.630 %

Duration

4.992 h

Impact parameter b

0.136

Rp / R★

0.077300

Transit midpoint (BJD)

2,458,217.0921

Photometric dip

Transit produces a flux drop of 6,300 ppm lasting ≈ 4.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.077300

Semi-major axis / stellar radius

4.430

Impact parameter (b)

0.136

RV semi-amplitude (K)

130.700 m/s

Transit mid-time (BJD)

2,458,217.0921

Angular separation (arcsec)

0.16200

Eq. Temperature

2,190K

(1917 °C)

Insolation (S⊕)

3,557.29

Earth = 1.00

Earth Similarity (ESI)

0.045

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

Smith 2015

Instrument

iKon-L CCD Camera

Publication

2015-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at SuperWASP (5 shown).

WASP-89 b · Gas Giant WASP-83 b · Gas Giant WASP-135 b · Gas Giant WASP-20 b · Gas Giant WASP-74 b · Gas Giant

Host System: WASP-82

Spectral Class

F-type yellow-white

Effective Temperature

6,480 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.100 R☉

Stellar Mass

1.480 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

3.960 dex

Stellar density

0.220 g/cm³

Systemic radial velocity

-23.63 km/s

Rotational v·sin i

2.60 km/s

Metallicity ratio

[Fe/H]

Distance

275.66 parsec

Light-years 899.09 ly

V-band magnitude

10.07 mag

Voyager-speed travel 15,855,534 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.599 mas

Total Proper Motion

24.835 mas/yr

PM Right Ascension

-16.15 mas/yr

PM Declination

-18.87 mas/yr

Galactic Cartesian (pc)

x = 0.298 · y = 0.954 · z = 0.033

Equatorial (J2000)

RA 72.66059° · Dec 1.89384°

Galactic ℓ, b

196.263° · -25.617°

Ecliptic λ, β

71.462° · -20.437°

HTM-20 index

1604012805