Key parameters at a glance

A radius of 18.38 Earth radii
A mass of 254.26 Earth masses
Surface gravity around 0.75 g
An orbital period of 5.148 days
Semi-major axis 0.0653 AU
Equilibrium temperature 1,760 K (1487 °C)
Distance from Earth 1,211.39 light-years
Earth Similarity Index 0.054
Travel time at Voyager 1 speed 21,362,845 years

WASP-187 b Planet Profile

Physical Specs

Radius

18.38 R⊕

Radius (Jupiter)

1.640 R♃

Mass

254.26 M⊕

Mass (Jupiter)

0.800 M♃

Density

0.22 g/cm³

Surface Gravity

0.75 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.054

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility SuperWASP

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#58of 1771

top 3.2%

This planet

18.38R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HATS-31 b 18.38 R⊕ NGTS-33 b 18.38 R⊕ K2-260 b 18.42 R⊕

Metric	Earth	WASP-187 b	Jupiter
Radius (R⊕)	1.00	18.38	11.21
Mass (M⊕)	1.00	254.26	317.83
Density (g/cm³)	5.51	0.22	1.33
Surface Gravity (g)	1.00	0.75	2.53
Insolation (S⊕)	1.00	1,594.76	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	254.264 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 15692883

Gaia DR2

Gaia DR2 306410392895767680

Gaia DR3

Gaia DR3 306410392895767680

System

WASP-187

Percentile among Gas Giant cohort

Radius 18.383 R⊕ · percentile 97 / cohort 1771

Mass 254.264 M⊕ · percentile 27 / cohort 1747

Orbital period 5.15 d · percentile 37 / cohort 1533

Distance 371.41 pc · percentile 67 / cohort 1759

ESI 0.054 · percentile 6 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5.148 days

Semi-major axis

0.0653 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 5.15 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0653 AU.

Transit Fingerprint

Depth

0.350 %

Duration

5.820 h

Impact parameter b

0.760

Transit midpoint (BJD)

2,455,197.3529

Photometric dip

Transit produces a flux drop of 3,500 ppm lasting ≈ 5.82 h.

Extended Orbital Architecture

Impact parameter (b)

0.760

RV semi-amplitude (K)

70.000 m/s

Transit mid-time (BJD)

2,455,197.3529

Long. of periastron (ω)

0.00°

Angular separation (arcsec)

0.17600

Eq. Temperature

1,760K

(1487 °C)

Insolation (S⊕)

1,594.76

Earth = 1.00

Earth Similarity (ESI)

0.054

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

Schanche et al. 2020

Instrument

iKon-L CCD Camera

Publication

2020-09

Observation locale

Ground

Host System: WASP-187

Spectral Class

F-type yellow-white

Effective Temperature

6,150 K — hotter than the Sun (5,778 K)

Estimated Age

2.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.830 R☉

Stellar Mass

1.540 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

3.722 dex

Stellar density

0.096 g/cm³

Systemic radial velocity

-20.00 km/s

Rotational v·sin i

15.30 km/s

Metallicity ratio

[Fe/H]

Distance

371.41 parsec

Light-years 1,211.39 ly

V-band magnitude

10.30 mag

Voyager-speed travel 21,362,845 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.664 mas

Total Proper Motion

26.436 mas/yr

PM Right Ascension

-24.17 mas/yr

PM Declination

-10.70 mas/yr

Galactic Cartesian (pc)

x = 0.860 · y = 0.271 · z = 0.433

Equatorial (J2000)

RA 17.47474° · Dec 25.68165°

Galactic ℓ, b

128.142° · -37.003°

Ecliptic λ, β

26.072° · 16.856°

HTM-20 index

1558006230