Key parameters at a glance

A radius of 11.38 Earth radii
A mass of 239.32 Earth masses
Surface gravity around 1.85 g
An orbital period of 2.544 days
Semi-major axis 0.0370 AU
Equilibrium temperature 1,429 K (1156 °C)
Distance from Earth 2,441.55 light-years
Earth Similarity Index 0.096
Travel time at Voyager 1 speed 43,056,818 years

HATS-54 b Planet Profile

Physical Specs

Radius

11.38 R⊕

Radius (Jupiter)

1.015 R♃

Mass

239.32 M⊕

Mass (Jupiter)

0.753 M♃

Density

0.77 g/cm³

Surface Gravity

1.85 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.096

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#1609of 1771

top 90.8%

This planet

11.38R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-2184 b 11.40 R⊕ TOI-3235 b 11.40 R⊕ TOI-5916 b 11.35 R⊕

Metric	Earth	HATS-54 b	Jupiter
Radius (R⊕)	1.00	11.38	11.21
Mass (M⊕)	1.00	239.32	317.83
Density (g/cm³)	5.51	0.77	1.33
Surface Gravity (g)	1.00	1.85	2.53
Insolation (S⊕)	1.00	476.97	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	239.325 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 363851359

Gaia DR2

Gaia DR2 6087996849371141248

Gaia DR3

Gaia DR3 6087996849371141248

System

HATS-54

Percentile among Gas Giant cohort

Radius 11.377 R⊕ · percentile 9 / cohort 1771

Mass 239.325 M⊕ · percentile 26 / cohort 1747

Orbital period 2.54 d · percentile 11 / cohort 1533

Distance 748.59 pc · percentile 82 / cohort 1759

ESI 0.096 · percentile 25 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.544 days

Semi-major axis

0.0370 AU

Eccentricity

0.000

Inclination

83.67 °

Year Length

A year here lasts approximately 2.54 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0370 AU.

Transit Fingerprint

Depth

0.678 %

Duration

2.468 h

Impact parameter b

0.715

Rp / R★

0.084800

Transit midpoint (BJD)

2,457,780.0102

Photometric dip

Transit produces a flux drop of 6,780 ppm lasting ≈ 2.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.084800

Semi-major axis / stellar radius

6.480

Impact parameter (b)

0.715

RV semi-amplitude (K)

108.000 m/s

Transit mid-time (BJD)

2,457,780.0102

Angular separation (arcsec)

0.04940

Eq. Temperature

1,429K

(1156 °C)

Insolation (S⊕)

476.97

Earth = 1.00

Earth Similarity (ESI)

0.096

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

Espinoza et al. 2019

Instrument

Apogee 4K CCD Sensor

Publication

2019-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at HATSouth (5 shown).

HATS-57 b · Gas Giant HATS-55 b · Gas Giant HATS-58 A b · Gas Giant HATS-70 b · Gas Giant HATS-56 b · Gas Giant

Host System: HATS-54

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,621 K — cooler than the Sun (5,778 K)

Estimated Age

7.96 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.230 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.795 g/cm³

Systemic radial velocity

46.13 km/s

Rotational v·sin i

2.50 km/s

Metallicity ratio

[Fe/H]

Distance

748.59 parsec

Light-years 2,441.55 ly

V-band magnitude

13.94 mag

Voyager-speed travel 43,056,818 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.308 mas

Total Proper Motion

8.635 mas/yr

PM Right Ascension

-3.45 mas/yr

PM Declination

-7.92 mas/yr

Galactic Cartesian (pc)

x = -0.665 · y = -0.251 · z = -0.703

Equatorial (J2000)

RA 200.63486° · Dec -44.68884°

Galactic ℓ, b

308.731° · 17.832°

Ecliptic λ, β

217.446° · -33.063°

HTM-20 index

-1494867159