Key parameters at a glance

A radius of 12.27 Earth radii
A mass of 327.36 Earth masses
Surface gravity around 2.17 g
An orbital period of 4.218 days
Semi-major axis 0.0580 AU
Equilibrium temperature 1,721 K (1448 °C)
Distance from Earth 1,316.34 light-years
Earth Similarity Index 0.079
Travel time at Voyager 1 speed 23,213,589 years

HATS-58 A b Planet Profile

Physical Specs

Radius

12.27 R⊕

Radius (Jupiter)

1.095 R♃

Mass

327.36 M⊕

Mass (Jupiter)

1.030 M♃

Density

0.96 g/cm³

Surface Gravity

2.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.079

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

#1392of 1771

top 78.5%

This planet

12.27R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-3976 A b 12.27 R⊕ TOI-4127 b 12.29 R⊕ WASP-170 b 12.29 R⊕

Metric	Earth	HATS-58 A b	Jupiter
Radius (R⊕)	1.00	12.27	11.21
Mass (M⊕)	1.00	327.36	317.83
Density (g/cm³)	5.51	0.96	1.33
Surface Gravity (g)	1.00	2.17	2.53
Insolation (S⊕)	1.00	382.71	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	327.365 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 21113347

Gaia DR2

Gaia DR2 6128363666439822208

Gaia DR3

Gaia DR3 6128363666439822208

System

HATS-58

Percentile among Gas Giant cohort

Radius 12.274 R⊕ · percentile 21 / cohort 1771

Mass 327.365 M⊕ · percentile 36 / cohort 1747

Orbital period 4.22 d · percentile 32 / cohort 1533

Distance 403.59 pc · percentile 70 / cohort 1759

ESI 0.079 · percentile 18 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.218 days

Semi-major axis

0.0580 AU

Eccentricity

0.168

Inclination

85.69 °

Year Length

A year here lasts approximately 4.22 Earth days (1.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0580 AU.

Transit Fingerprint

Depth

0.788 %

Duration

3.180 h

Impact parameter b

0.655

Rp / R★

0.078600

Transit midpoint (BJD)

2,457,463.2999

Photometric dip

Transit produces a flux drop of 7,882 ppm lasting ≈ 3.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.078600

Semi-major axis / stellar radius

8.710

Impact parameter (b)

0.655

RV semi-amplitude (K)

100.000 m/s

Transit mid-time (BJD)

2,457,463.2999

Angular separation (arcsec)

0.14400

Eq. Temperature

1,721K

(1448 °C)

Insolation (S⊕)

382.71

Earth = 1.00

Earth Similarity (ESI)

0.079

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-54 b · Gas Giant HATS-55 b · Gas Giant HATS-70 b · Gas Giant HATS-56 b · Gas Giant

Host System: HATS-58 A

Spectral Class

F-type yellow-white

Effective Temperature

7,175 K — hotter than the Sun (5,778 K)

Estimated Age

0.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.433 R☉

Stellar Mass

1.461 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.292 dex

Stellar density

0.702 g/cm³

Systemic radial velocity

19.29 km/s

Rotational v·sin i

6.22 km/s

Distance

403.59 parsec

Light-years 1,316.34 ly

V-band magnitude

11.57 mag

Voyager-speed travel 23,213,589 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

2.348 mas

Total Proper Motion

13.105 mas/yr

PM Right Ascension

-12.70 mas/yr

PM Declination

-3.23 mas/yr

Galactic Cartesian (pc)

x = -0.652 · y = -0.078 · z = -0.754

Equatorial (J2000)

RA 186.78730° · Dec -48.97841°

Galactic ℓ, b

298.834° · 13.700°

Ecliptic λ, β

209.665° · -41.403°

HTM-20 index

-1246945769