Key parameters at a glance

A radius of 20.85 Earth radii
A mass of 467.21 Earth masses
Surface gravity around 1.07 g
An orbital period of 2.161 days
Semi-major axis 0.0340 AU
Equilibrium temperature 1,654 K (1381 °C)
Distance from Earth 2,084.15 light-years
Earth Similarity Index 0.059
Travel time at Voyager 1 speed 36,753,981 years

HATS-23 b Planet Profile

Physical Specs

Radius

20.85 R⊕

Radius (Jupiter)

1.860 R♃

Mass

467.21 M⊕

Mass (Jupiter)

1.470 M♃

Density

0.29 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.059

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Transit

Facility HATSouth

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#25of 1771

top 1.4%

This planet

20.85R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

CFHTWIR-Oph 98 b 20.85 R⊕ WASP-76 b 20.78 R⊕ HAT-P-33 b 20.74 R⊕

Metric	Earth	HATS-23 b	Jupiter
Radius (R⊕)	1.00	20.85	11.21
Mass (M⊕)	1.00	467.21	317.83
Density (g/cm³)	5.51	0.29	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	467.210 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 7088246

Gaia DR2

Gaia DR2 6657994706683397504

Gaia DR3

Gaia DR3 6657994706683397504

System

HATS-23

Percentile among Gas Giant cohort

Radius 20.849 R⊕ · percentile 99 / cohort 1771

Mass 467.210 M⊕ · percentile 47 / cohort 1747

Orbital period 2.16 d · percentile 8 / cohort 1533

Distance 639.00 pc · percentile 79 / cohort 1759

ESI 0.059 · percentile 8 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.161 days

Semi-major axis

0.0340 AU

Eccentricity

0.114

Inclination

81.02 °

Year Length

A year here lasts approximately 2.16 Earth days (0.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0340 AU.

Transit Fingerprint

Depth

1.936 %

Duration

1.805 h

Impact parameter b

0.949

Rp / R★

0.159000

Transit midpoint (BJD)

2,457,072.8527

Photometric dip

Transit produces a flux drop of 19,358 ppm lasting ≈ 1.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.159000

Semi-major axis / stellar radius

6.080

Impact parameter (b)

0.949

RV semi-amplitude (K)

212.300 m/s

Transit mid-time (BJD)

2,457,072.8527

Angular separation (arcsec)

0.05320

Eq. Temperature

1,654K

(1381 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.059

0 = alien, 1 = Earth-identical

Insufficient insolation data — 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

Bento et al. 2017

Instrument

Multiple Instruments

Publication

2017-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at HATSouth (6 shown).

HATS-22 b · Gas Giant HATS-50 b · Gas Giant HATS-53 b · Gas Giant HATS-51 b · Gas Giant HATS-52 b · Gas Giant HATS-24 b · Gas Giant

Host System: HATS-23

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,780 K — hotter than the Sun (5,778 K)

Estimated Age

4.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.199 R☉

Stellar Mass

1.121 M☉

Metallicity [Fe/H]

0.28

Extended Stellar Properties

Surface gravity (log g)

4.328 dex

Stellar density

0.910 g/cm³

Systemic radial velocity

-13.37 km/s

Rotational v·sin i

4.62 km/s

Metallicity ratio

[Fe/H]

Distance

639.00 parsec

Light-years 2,084.15 ly

V-band magnitude

13.84 mag

Voyager-speed travel 36,753,981 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.536 mas

Total Proper Motion

7.365 mas/yr

PM Right Ascension

7.31 mas/yr

PM Declination

-0.86 mas/yr

Galactic Cartesian (pc)

x = 0.181 · y = -0.616 · z = -0.767

Equatorial (J2000)

RA 286.36675° · Dec -50.06735°

Galactic ℓ, b

346.885° · -22.619°

Ecliptic λ, β

281.740° · -27.293°

HTM-20 index

721693256