Key parameters at a glance

A radius of 15.47 Earth radii
A mass of 174.81 Earth masses
Surface gravity around 0.73 g
An orbital period of 3.840 days
Semi-major axis 0.0538 AU
Equilibrium temperature 1,850 K (1577 °C)
Distance from Earth 2,333.26 light-years
Earth Similarity Index 0.056
Travel time at Voyager 1 speed 41,147,119 years

WASP-159 b Planet Profile

Physical Specs

Radius

15.47 R⊕

Radius (Jupiter)

1.380 R♃

Mass

174.81 M⊕

Mass (Jupiter)

0.550 M♃

Density

0.28 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.056

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility SuperWASP-South

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#201of 1771

top 11.3%

This planet

15.47R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-14 b 15.47 R⊕ WASP-24 b 15.47 R⊕ WASP-20 b 15.47 R⊕

Metric	Earth	WASP-159 b	Jupiter
Radius (R⊕)	1.00	15.47	11.21
Mass (M⊕)	1.00	174.81	317.83
Density (g/cm³)	5.51	0.28	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	1,599.92	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	174.807 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 77156657

Gaia DR2

Gaia DR2 4864759888238232320

Gaia DR3

Gaia DR3 4864759888238232320

System

WASP-159

Percentile among Gas Giant cohort

Radius 15.468 R⊕ · percentile 89 / cohort 1771

Mass 174.807 M⊕ · percentile 16 / cohort 1747

Orbital period 3.84 d · percentile 27 / cohort 1533

Distance 715.38 pc · percentile 81 / cohort 1759

ESI 0.056 · percentile 7 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.840 days

Semi-major axis

0.0538 AU

Eccentricity

0.000

Inclination

88.10 °

Year Length

A year here lasts approximately 3.84 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0538 AU.

Transit Fingerprint

Depth

0.453 %

Duration

5.587 h

Impact parameter b

0.180

Rp / R★

0.067300

Transit midpoint (BJD)

2,457,668.0849

Photometric dip

Transit produces a flux drop of 4,530 ppm lasting ≈ 5.59 h.

Extended Orbital Architecture

Planet / star radius ratio

0.067300

Semi-major axis / stellar radius

5.440

Impact parameter (b)

0.180

RV semi-amplitude (K)

57.000 m/s

Transit mid-time (BJD)

2,457,668.0849

Angular separation (arcsec)

0.07520

Eq. Temperature

1,850K

(1577 °C)

Insolation (S⊕)

1,599.92

Earth = 1.00

Earth Similarity (ESI)

0.056

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. 2019

Instrument

iKon-L CCD Camera

Publication

2019-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at SuperWASP-South (12 shown).

WASP-162 b · Gas Giant WASP-145 A b · Gas Giant WASP-144 b · Neptune-like WASP-170 b · Gas Giant WASP-160 B b · Gas Giant WASP-158 b · Gas Giant WASP-161 b · Gas Giant WASP-164 b · Gas Giant WASP-163 b · Gas Giant WASP-147 b · Gas Giant WASP-173 A b · Gas Giant WASP-165 b · Gas Giant

Host System: WASP-159

Spectral Class

F-type yellow-white

Effective Temperature

6,120 K — hotter than the Sun (5,778 K)

Estimated Age

3.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.110 R☉

Stellar Mass

1.410 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

3.940 dex

Stellar density

0.210 g/cm³

Systemic radial velocity

35.16 km/s

Rotational v·sin i

5.70 km/s

Distance

715.38 parsec

Light-years 2,333.26 ly

V-band magnitude

12.84 mag

Voyager-speed travel 41,147,119 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

1.369 mas

Total Proper Motion

5.496 mas/yr

PM Right Ascension

-0.77 mas/yr

PM Declination

5.44 mas/yr

Galactic Cartesian (pc)

x = 0.290 · y = 0.722 · z = -0.629

Equatorial (J2000)

RA 68.13648° · Dec -38.96830°

Galactic ℓ, b

242.174° · -42.915°

Ecliptic λ, β

54.890° · -59.771°

HTM-20 index

2077847435