Key parameters at a glance

A radius of 11.77 Earth radii
A mass of 204.68 Earth masses
Surface gravity around 1.48 g
An orbital period of 2.839 days
Semi-major axis 0.0377 AU
Equilibrium temperature 1,338 K (1065 °C)
Distance from Earth 1,299.00 light-years
Earth Similarity Index 0.102
Travel time at Voyager 1 speed 22,907,883 years

WASP-57 b Planet Profile

Physical Specs

Radius

11.77 R⊕

Radius (Jupiter)

1.050 R♃

Mass

204.68 M⊕

Mass (Jupiter)

0.644 M♃

Density

0.69 g/cm³

Surface Gravity

1.48 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.102

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#1564of 1771

top 88.3%

This planet

11.77R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-17 b 11.77 R⊕ CoRoT-23 b 11.77 R⊕ Kepler-75 b 11.77 R⊕

Metric	Earth	WASP-57 b	Jupiter
Radius (R⊕)	1.00	11.77	11.21
Mass (M⊕)	1.00	204.68	317.83
Density (g/cm³)	5.51	0.69	1.33
Surface Gravity (g)	1.00	1.48	2.53
Insolation (S⊕)	1.00	702.39	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	204.683 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 175772482

Gaia DR2

Gaia DR2 6340377202215639936

Gaia DR3

Gaia DR3 6340377202215639936

System

WASP-57

Percentile among Gas Giant cohort

Radius 11.769 R⊕ · percentile 12 / cohort 1771

Mass 204.683 M⊕ · percentile 21 / cohort 1747

Orbital period 2.84 d · percentile 14 / cohort 1533

Distance 398.28 pc · percentile 69 / cohort 1759

ESI 0.102 · percentile 27 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.839 days

Semi-major axis

0.0377 AU

Eccentricity

0.000

Inclination

86.05 °

Year Length

A year here lasts approximately 2.84 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0377 AU.

Transit Fingerprint

Depth

1.269 %

Duration

2.304 h

Impact parameter b

0.345

Rp / R★

0.118200

Transit midpoint (BJD)

2,456,058.5491

Photometric dip

Transit produces a flux drop of 12,690 ppm lasting ≈ 2.30 h.

Extended Orbital Architecture

Planet / star radius ratio

0.118200

Semi-major axis / stellar radius

8.749

Impact parameter (b)

0.345

RV semi-amplitude (K)

100.000 m/s

Transit mid-time (BJD)

2,456,058.5491

Angular separation (arcsec)

0.09460

Eq. Temperature

1,338K

(1065 °C)

Insolation (S⊕)

702.39

Earth = 1.00

Earth Similarity (ESI)

0.102

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

Faedi et al. 2013

Instrument

iKon-L CCD Camera

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at SuperWASP (12 shown).

WASP-59 b · Neptune-like WASP-80 b · Gas Giant WASP-42 b · Gas Giant WASP-67 b · Gas Giant WASP-56 b · Gas Giant WASP-47 b · Gas Giant WASP-41 b · Gas Giant WASP-58 b · Gas Giant WASP-52 b · Gas Giant WASP-55 b · Gas Giant WASP-61 b · Gas Giant WASP-66 b · Gas Giant

Host System: WASP-57

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,600 K — cooler than the Sun (5,778 K)

Estimated Age

2.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.927 R☉

Stellar Mass

0.886 M☉

Metallicity [Fe/H]

-0.25

Extended Stellar Properties

Surface gravity (log g)

4.452 dex

Stellar density

1.568 g/cm³

Systemic radial velocity

-23.21 km/s

Rotational v·sin i

3.70 km/s

Metallicity ratio

[Fe/H]

Distance

398.28 parsec

Light-years 1,299.00 ly

V-band magnitude

12.91 mag

Voyager-speed travel 22,907,883 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.483 mas

Total Proper Motion

27.467 mas/yr

PM Right Ascension

-27.06 mas/yr

PM Declination

-4.69 mas/yr

Galactic Cartesian (pc)

x = -0.721 · y = -0.692 · z = -0.036

Equatorial (J2000)

RA 223.81998° · Dec -2.05769°

Galactic ℓ, b

353.504° · 48.273°

Ecliptic λ, β

221.991° · 14.022°

HTM-20 index

467470616