Key parameters at a glance

A radius of 12.67 Earth radii
A mass of 123.95 Earth masses
Surface gravity around 0.77 g
An orbital period of 3.830 days
Semi-major axis 0.0505 AU
Equilibrium temperature 1,275 K (1002 °C)
Distance from Earth 2,468.16 light-years
Earth Similarity Index 0.093
Travel time at Voyager 1 speed 43,525,989 years

HATS-50 b Planet Profile

Physical Specs

Radius

12.67 R⊕

Radius (Jupiter)

1.130 R♃

Mass

123.95 M⊕

Mass (Jupiter)

0.390 M♃

Density

0.33 g/cm³

Surface Gravity

0.77 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.093

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

#1170of 1771

top 66.0%

This planet

12.67R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TrES-1 b 12.67 R⊕ HD 189733 b 12.67 R⊕ WASP-8 b 12.67 R⊕

Metric	Earth	HATS-50 b	Jupiter
Radius (R⊕)	1.00	12.67	11.21
Mass (M⊕)	1.00	123.95	317.83
Density (g/cm³)	5.51	0.33	1.33
Surface Gravity (g)	1.00	0.77	2.53
Insolation (S⊕)	1.00	625.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	123.954 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 301031110

Gaia DR2

Gaia DR2 6850309426503755520

Gaia DR3

Gaia DR3 6850309426503755520

System

HATS-50

Percentile among Gas Giant cohort

Radius 12.666 R⊕ · percentile 34 / cohort 1771

Mass 123.954 M⊕ · percentile 8 / cohort 1747

Orbital period 3.83 d · percentile 27 / cohort 1533

Distance 756.74 pc · percentile 82 / cohort 1759

ESI 0.093 · percentile 24 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.830 days

Semi-major axis

0.0505 AU

Eccentricity

0.516

Inclination

87.54 °

Year Length

A year here lasts approximately 3.83 Earth days (1.0% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0505 AU.

Transit Fingerprint

Depth

1.230 %

Duration

3.079 h

Impact parameter b

0.421

Rp / R★

0.103800

Transit midpoint (BJD)

2,456,870.3479

Photometric dip

Transit produces a flux drop of 12,300 ppm lasting ≈ 3.08 h.

Extended Orbital Architecture

Planet / star radius ratio

0.103800

Semi-major axis / stellar radius

9.720

Impact parameter (b)

0.421

RV semi-amplitude (K)

45.000 m/s

Transit mid-time (BJD)

2,456,870.3479

Angular separation (arcsec)

0.06670

Eq. Temperature

1,275K

(1002 °C)

Insolation (S⊕)

625.30

Earth = 1.00

Earth Similarity (ESI)

0.093

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-53 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-50

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,990 K — hotter than the Sun (5,778 K)

Estimated Age

1.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.117 R☉

Stellar Mass

1.168 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.411 dex

Stellar density

1.190 g/cm³

Systemic radial velocity

-20.25 km/s

Rotational v·sin i

3.76 km/s

Distance

756.74 parsec

Light-years 2,468.16 ly

V-band magnitude

14.05 mag

Voyager-speed travel 43,525,989 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

1.293 mas

Total Proper Motion

8.336 mas/yr

PM Right Ascension

7.33 mas/yr

PM Declination

3.98 mas/yr

Galactic Cartesian (pc)

x = 0.455 · y = -0.774 · z = -0.440

Equatorial (J2000)

RA 300.42808° · Dec -26.07756°

Galactic ℓ, b

15.578° · -26.215°

Ecliptic λ, β

297.188° · -5.465°

HTM-20 index

-684962312