Key parameters at a glance

A radius of 18.92 Earth radii
A mass of 191.33 Earth masses
Surface gravity around 0.53 g
An orbital period of 4.325 days
Semi-major axis 0.0604 AU
Equilibrium temperature 1,902 K (1629 °C)
Distance from Earth 1,840.85 light-years
Earth Similarity Index 0.045
Travel time at Voyager 1 speed 32,463,455 years

HATS-56 b Planet Profile

Physical Specs

Radius

18.92 R⊕

Radius (Jupiter)

1.688 R♃

Mass

191.33 M⊕

Mass (Jupiter)

0.602 M♃

Density

0.16 g/cm³

Surface Gravity

0.53 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.045

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

#46of 1771

top 2.5%

This planet

18.92R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HATS-67 b 18.89 R⊕ TOI-615 b 18.98 R⊕ CoRoT-35 b 18.83 R⊕

Metric	Earth	HATS-56 b	Jupiter
Radius (R⊕)	1.00	18.92	11.21
Mass (M⊕)	1.00	191.33	317.83
Density (g/cm³)	5.51	0.16	1.33
Surface Gravity (g)	1.00	0.53	2.53
Insolation (S⊕)	1.00	1,080.87	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	191.334 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 272213425

Gaia DR2

Gaia DR2 6144125887172751232

Gaia DR3

Gaia DR3 6144125887169672064

System

HATS-56

Percentile among Gas Giant cohort

Radius 18.921 R⊕ · percentile 97 / cohort 1771

Mass 191.334 M⊕ · percentile 19 / cohort 1747

Orbital period 4.32 d · percentile 32 / cohort 1533

Distance 564.41 pc · percentile 78 / cohort 1759

ESI 0.045 · percentile 3 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.325 days

Semi-major axis

0.0604 AU

Eccentricity

0.019

Inclination

83.29 °

Year Length

A year here lasts approximately 4.32 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0604 AU.

Transit Fingerprint

Depth

0.638 %

Duration

4.642 h

Impact parameter b

0.690

Rp / R★

0.078900

Transit midpoint (BJD)

2,457,788.0029

Photometric dip

Transit produces a flux drop of 6,380 ppm lasting ≈ 4.64 h.

Extended Orbital Architecture

Planet / star radius ratio

0.078900

Semi-major axis / stellar radius

5.902

Impact parameter (b)

0.690

RV semi-amplitude (K)

55.100 m/s

Transit mid-time (BJD)

2,457,788.0029

Angular separation (arcsec)

0.10700

Eq. Temperature

1,902K

(1629 °C)

Insolation (S⊕)

1,080.87

Earth = 1.00

Earth Similarity (ESI)

0.045

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-58 A b · Gas Giant HATS-70 b · Gas Giant

Host System: HATS-56

Spectral Class

F-type yellow-white

Effective Temperature

6,536 K — hotter than the Sun (5,778 K)

Estimated Age

1.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.201 R☉

Stellar Mass

1.573 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

3.949 dex

Stellar density

0.208 g/cm³

Systemic radial velocity

35.15 km/s

Rotational v·sin i

6.49 km/s

Metallicity ratio

[Fe/H]

Distance

564.41 parsec

Light-years 1,840.85 ly

V-band magnitude

11.48 mag

Voyager-speed travel 32,463,455 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.744 mas

Total Proper Motion

9.095 mas/yr

PM Right Ascension

-8.60 mas/yr

PM Declination

-2.95 mas/yr

Galactic Cartesian (pc)

x = -0.697 · y = -0.002 · z = -0.717

Equatorial (J2000)

RA 180.16507° · Dec -45.79946°

Galactic ℓ, b

293.753° · 16.165°

Ecliptic λ, β

202.372° · -41.067°

HTM-20 index

103279488