Key parameters at a glance

A radius of 12.44 Earth radii
A mass of 1,341.24 Earth masses
Surface gravity around 8.66 g
An orbital period of 5.027 days
Semi-major axis 0.0600 AU
Equilibrium temperature 1,378 K (1105 °C)
Distance from Earth 908.39 light-years
Earth Similarity Index 0.121
Travel time at Voyager 1 speed 16,019,459 years

WASP-186 b Planet Profile

Physical Specs

Radius

12.44 R⊕

Radius (Jupiter)

1.110 R♃

Mass

1,341.24 M⊕

Mass (Jupiter)

4.220 M♃

Density

3.82 g/cm³

Surface Gravity

8.66 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.121

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

#1287of 1771

top 72.6%

This planet

12.44R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HR 2562 b 12.44 R⊕ WASP-49 b 12.44 R⊕ WASP-11 b 12.44 R⊕

Metric	Earth	WASP-186 b	Jupiter
Radius (R⊕)	1.00	12.44	11.21
Mass (M⊕)	1.00	1,341.24	317.83
Density (g/cm³)	5.51	3.82	1.33
Surface Gravity (g)	1.00	8.66	2.53
Insolation (S⊕)	1.00	853.14	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,341.243 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 411608801

Gaia DR2

Gaia DR2 2790691147020786816

Gaia DR3

Gaia DR3 2790691147020786816

System

WASP-186

Percentile among Gas Giant cohort

Radius 12.442 R⊕ · percentile 27 / cohort 1771

Mass 1,341.243 M⊕ · percentile 72 / cohort 1747

Orbital period 5.03 d · percentile 37 / cohort 1533

Distance 278.51 pc · percentile 58 / cohort 1759

ESI 0.121 · percentile 32 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5.027 days

Semi-major axis

0.0600 AU

Eccentricity

0.330

Inclination

83.59 °

Year Length

A year here lasts approximately 5.03 Earth days (1.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0600 AU.

Transit Fingerprint

Depth

0.610 %

Duration

2.704 h

Impact parameter b

0.840

Rp / R★

0.078100

Transit midpoint (BJD)

2,456,237.1195

Photometric dip

Transit produces a flux drop of 6,100 ppm lasting ≈ 2.70 h.

Extended Orbital Architecture

Planet / star radius ratio

0.078100

Semi-major axis / stellar radius

8.780

Impact parameter (b)

0.840

RV semi-amplitude (K)

530.290 m/s

Transit mid-time (BJD)

2,456,237.1195

Long. of periastron (ω)

173.00°

Sky-projected obliquity (λ)

-10.00°

True obliquity (ψ)

22.00°

Angular separation (arcsec)

0.21500

Eq. Temperature

1,378K

(1105 °C)

Insolation (S⊕)

853.14

Earth = 1.00

Earth Similarity (ESI)

0.121

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-186

Spectral Class

F-type yellow-white

Effective Temperature

6,361 K — hotter than the Sun (5,778 K)

Estimated Age

3.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.470 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.193 dex

Stellar density

0.546 g/cm³

Systemic radial velocity

-5.94 km/s

Rotational v·sin i

15.60 km/s

Rotation period

4.80 days

Metallicity ratio

[Fe/H]

Distance

278.51 parsec

Light-years 908.39 ly

V-band magnitude

10.81 mag

Voyager-speed travel 16,019,459 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.562 mas

Total Proper Motion

23.552 mas/yr

PM Right Ascension

21.67 mas/yr

PM Declination

-9.22 mas/yr

Galactic Cartesian (pc)

x = 0.879 · y = 0.303 · z = 0.368

Equatorial (J2000)

RA 18.99531° · Dec 21.61691°

Galactic ℓ, b

130.486° · -40.895°

Ecliptic λ, β

25.755° · 12.570°

HTM-20 index

-1570079728