Key parameters at a glance

A radius of 11.43 Earth radii
A mass of 420.47 Earth masses
Surface gravity around 3.22 g
An orbital period of 2.517 days
Semi-major axis 0.0362 AU
Equilibrium temperature 1,315 K (1042 °C)
Distance from Earth 1,358.31 light-years
Earth Similarity Index 0.119
Travel time at Voyager 1 speed 23,953,725 years

HATS-4 b Planet Profile

Physical Specs

Radius

11.43 R⊕

Radius (Jupiter)

1.020 R♃

Mass

420.47 M⊕

Mass (Jupiter)

1.323 M♃

Density

1.55 g/cm³

Surface Gravity

3.22 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.119

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#1599of 1771

top 90.2%

This planet

11.43R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-7041 b 11.43 R⊕ WASP-99 b 11.43 R⊕ TOI-564 b 11.43 R⊕

Metric	Earth	HATS-4 b	Jupiter
Radius (R⊕)	1.00	11.43	11.21
Mass (M⊕)	1.00	420.47	317.83
Density (g/cm³)	5.51	1.55	1.33
Surface Gravity (g)	1.00	3.22	2.53
Insolation (S⊕)	1.00	558.83	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	420.471 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 59843967

Gaia DR2

Gaia DR2 2937583121652951936

Gaia DR3

Gaia DR3 2937583121652951936

System

HATS-4

Percentile among Gas Giant cohort

Radius 11.433 R⊕ · percentile 10 / cohort 1771

Mass 420.471 M⊕ · percentile 44 / cohort 1747

Orbital period 2.52 d · percentile 11 / cohort 1533

Distance 416.46 pc · percentile 71 / cohort 1759

ESI 0.119 · percentile 32 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.517 days

Semi-major axis

0.0362 AU

Eccentricity

0.013

Inclination

88.50 °

Year Length

A year here lasts approximately 2.52 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0362 AU.

Transit Fingerprint

Depth

1.641 %

Duration

2.527 h

Impact parameter b

0.217

Rp / R★

0.113200

Transit midpoint (BJD)

2,455,808.3410

Photometric dip

Transit produces a flux drop of 16,407 ppm lasting ≈ 2.53 h.

Extended Orbital Architecture

Planet / star radius ratio

0.113200

Semi-major axis / stellar radius

8.430

Impact parameter (b)

0.217

RV semi-amplitude (K)

197.500 m/s

Transit mid-time (BJD)

2,455,808.3410

Long. of periastron (ω)

275.00°

Angular separation (arcsec)

0.08690

Eq. Temperature

1,315K

(1042 °C)

Insolation (S⊕)

558.83

Earth = 1.00

Earth Similarity (ESI)

0.119

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

Jordan et al. 2014

Instrument

Apogee 4K CCD Sensor

Publication

2014-08

Observation locale

Ground

Host System: HATS-4

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,403 K — cooler than the Sun (5,778 K)

Estimated Age

2.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.925 R☉

Stellar Mass

1.001 M☉

Metallicity [Fe/H]

0.43

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

1.352 g/cm³

Systemic radial velocity

27.31 km/s

Rotational v·sin i

0.70 km/s

Metallicity ratio

[Fe/H]

Distance

416.46 parsec

Light-years 1,358.31 ly

V-band magnitude

13.52 mag

Voyager-speed travel 23,953,725 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.372 mas

Total Proper Motion

2.498 mas/yr

PM Right Ascension

0.27 mas/yr

PM Declination

2.48 mas/yr

Galactic Cartesian (pc)

x = -0.066 · y = 0.921 · z = -0.383

Equatorial (J2000)

RA 94.11209° · Dec -22.54688°

Galactic ℓ, b

229.825° · -17.448°

Ecliptic λ, β

95.458° · -45.908°

HTM-20 index

1836883667