Key parameters at a glance

A radius of 15.02 Earth radii
A mass of 189.11 Earth masses
Surface gravity around 0.84 g
An orbital period of 3.854 days
Semi-major axis 0.0475 AU
Equilibrium temperature 1,312 K (1039 °C)
Distance from Earth 1,910.52 light-years
Earth Similarity Index 0.085
Travel time at Voyager 1 speed 33,692,089 years

HATS-53 b Planet Profile

Physical Specs

Radius

15.02 R⊕

Radius (Jupiter)

1.340 R♃

Mass

189.11 M⊕

Mass (Jupiter)

0.595 M♃

Density

0.30 g/cm³

Surface Gravity

0.84 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.085

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#230of 1771

top 12.9%

This planet

15.02R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-2420 b 15.02 R⊕ Kepler-412 b 15.03 R⊕ WASP-114 b 15.01 R⊕

Metric	Earth	HATS-53 b	Jupiter
Radius (R⊕)	1.00	15.02	11.21
Mass (M⊕)	1.00	189.11	317.83
Density (g/cm³)	5.51	0.30	1.33
Surface Gravity (g)	1.00	0.84	2.53
Insolation (S⊕)	1.00	471.61	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	189.109 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 157266693

Gaia DR2

Gaia DR2 3465357945752055040

Gaia DR3

Gaia DR3 3465357945752055040

System

HATS-53

Percentile among Gas Giant cohort

Radius 15.020 R⊕ · percentile 87 / cohort 1771

Mass 189.109 M⊕ · percentile 18 / cohort 1747

Orbital period 3.85 d · percentile 27 / cohort 1533

Distance 585.77 pc · percentile 78 / cohort 1759

ESI 0.085 · percentile 20 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.854 days

Semi-major axis

0.0475 AU

Eccentricity

0.330

Inclination

88.78 °

Year Length

A year here lasts approximately 3.85 Earth days (1.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0475 AU.

Transit Fingerprint

Depth

1.865 %

Duration

3.506 h

Impact parameter b

0.198

Rp / R★

0.125000

Transit midpoint (BJD)

2,457,236.7565

Photometric dip

Transit produces a flux drop of 18,650 ppm lasting ≈ 3.51 h.

Extended Orbital Architecture

Planet / star radius ratio

0.125000

Semi-major axis / stellar radius

9.300

Impact parameter (b)

0.198

RV semi-amplitude (K)

79.000 m/s

Transit mid-time (BJD)

2,457,236.7565

Angular separation (arcsec)

0.08110

Eq. Temperature

1,312K

(1039 °C)

Insolation (S⊕)

471.61

Earth = 1.00

Earth Similarity (ESI)

0.085

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

Henning et al. 2018

Instrument

Apogee 4K CCD Sensor

Publication

2018-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at HATSouth (6 shown).

HATS-22 b · Gas Giant HATS-50 b · Gas Giant HATS-51 b · Gas Giant HATS-52 b · Gas Giant HATS-23 b · Gas Giant HATS-24 b · Gas Giant

Host System: HATS-53

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,644 K — cooler than the Sun (5,778 K)

Estimated Age

9.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.101 R☉

Stellar Mass

0.964 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

1.027 g/cm³

Systemic radial velocity

71.95 km/s

Rotational v·sin i

2.50 km/s

Distance

585.77 parsec

Light-years 1,910.52 ly

V-band magnitude

13.94 mag

Voyager-speed travel 33,692,089 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.679 mas

Total Proper Motion

35.323 mas/yr

PM Right Ascension

-35.02 mas/yr

PM Declination

-4.60 mas/yr

Galactic Cartesian (pc)

x = -0.829 · y = 0.049 · z = -0.557

Equatorial (J2000)

RA 176.62832° · Dec -33.86008°

Galactic ℓ, b

287.818° · 27.099°

Ecliptic λ, β

192.037° · -32.047°

HTM-20 index

582360882