Key parameters at a glance

A radius of 13.66 Earth radii
A mass of 282.55 Earth masses
Surface gravity around 1.51 g
An orbital period of 3.409 days
Semi-major axis 0.0442 AU
Equilibrium temperature 1,456 K (1183 °C)
Distance from Earth 1,136.63 light-years
Earth Similarity Index 0.089
Travel time at Voyager 1 speed 20,044,541 years

WASP-28 b Planet Profile

Physical Specs

Radius

13.66 R⊕

Radius (Jupiter)

1.219 R♃

Mass

282.55 M⊕

Mass (Jupiter)

0.889 M♃

Density

0.65 g/cm³

Surface Gravity

1.51 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.089

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

#604of 1771

top 34.0%

This planet

13.66R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-43 b 13.66 R⊕ TOI-3135 b 13.65 R⊕ TOI-4201 b 13.67 R⊕

Metric	Earth	WASP-28 b	Jupiter
Radius (R⊕)	1.00	13.66	11.21
Mass (M⊕)	1.00	282.55	317.83
Density (g/cm³)	5.51	0.65	1.33
Surface Gravity (g)	1.00	1.51	2.53
Insolation (S⊕)	1.00	695.65	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	282.549 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 398572544

Gaia DR2

Gaia DR2 2641087471777046016

Gaia DR3

Gaia DR3 2641087471777046016

System

WASP-28

Percentile among Gas Giant cohort

Radius 13.664 R⊕ · percentile 66 / cohort 1771

Mass 282.549 M⊕ · percentile 31 / cohort 1747

Orbital period 3.41 d · percentile 22 / cohort 1533

Distance 348.49 pc · percentile 65 / cohort 1759

ESI 0.089 · percentile 22 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.409 days

Semi-major axis

0.0442 AU

Eccentricity

0.000

Inclination

88.51 °

Year Length

A year here lasts approximately 3.41 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0442 AU.

Transit Fingerprint

Depth

1.340 %

Duration

3.239 h

Impact parameter b

0.228

Rp / R★

0.116000

Transit midpoint (BJD)

2,457,642.5021

Photometric dip

Transit produces a flux drop of 13,396 ppm lasting ≈ 3.24 h.

Extended Orbital Architecture

Planet / star radius ratio

0.116000

Semi-major axis / stellar radius

8.620

Impact parameter (b)

0.228

RV semi-amplitude (K)

120.500 m/s

Transit mid-time (BJD)

2,457,642.5021

Sky-projected obliquity (λ)

6.00°

Angular separation (arcsec)

0.12700

Eq. Temperature

1,456K

(1183 °C)

Insolation (S⊕)

695.65

Earth = 1.00

Earth Similarity (ESI)

0.089

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

Petrucci et al. 2015

Instrument

iKon-L CCD Camera

Publication

2015-01

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-68 b · Gas Giant

Host System: WASP-28

Spectral Class

F-type yellow-white

Effective Temperature

6,084 K — hotter than the Sun (5,778 K)

Estimated Age

5.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.083 R☉

Stellar Mass

0.993 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.102 g/cm³

Systemic radial velocity

24.22 km/s

Rotational v·sin i

3.25 km/s

Metallicity ratio

[Fe/H]

Distance

348.49 parsec

Light-years 1,136.63 ly

V-band magnitude

12.27 mag

Voyager-speed travel 20,044,541 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.841 mas

Total Proper Motion

24.785 mas/yr

PM Right Ascension

22.32 mas/yr

PM Declination

10.78 mas/yr

Galactic Cartesian (pc)

x = 0.993 · y = -0.111 · z = -0.028

Equatorial (J2000)

RA 353.61627° · Dec -1.57998°

Galactic ℓ, b

83.860° · -58.486°

Ecliptic λ, β

353.510° · 1.084°

HTM-20 index

-1429021944