Key parameters at a glance

A radius of 14.59 Earth radii
A mass of 589.55 Earth masses
Surface gravity around 2.77 g
An orbital period of 3.446 days
Semi-major axis 0.0444 AU
Equilibrium temperature 1,359 K (1086 °C)
Distance from Earth 926.19 light-years
Earth Similarity Index 0.101
Travel time at Voyager 1 speed 16,333,332 years

HATS-1 b Planet Profile

Physical Specs

Radius

14.59 R⊕

Radius (Jupiter)

1.302 R♃

Mass

589.55 M⊕

Mass (Jupiter)

1.855 M♃

Density

1.03 g/cm³

Surface Gravity

2.77 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.101

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#269of 1771

top 15.1%

This planet

14.59R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-4487 A b 14.61 R⊕ HATS-16 b 14.57 R⊕ WASP-135 b 14.57 R⊕

Metric	Earth	HATS-1 b	Jupiter
Radius (R⊕)	1.00	14.59	11.21
Mass (M⊕)	1.00	589.55	317.83
Density (g/cm³)	5.51	1.03	1.33
Surface Gravity (g)	1.00	2.77	2.53
Insolation (S⊕)	1.00	489.95	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	589.550 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 219698950

Gaia DR2

Gaia DR2 3540018633568783488

Gaia DR3

Gaia DR3 3540018633568783488

System

HATS-1

Percentile among Gas Giant cohort

Radius 14.594 R⊕ · percentile 85 / cohort 1771

Mass 589.550 M⊕ · percentile 53 / cohort 1747

Orbital period 3.45 d · percentile 22 / cohort 1533

Distance 283.97 pc · percentile 59 / cohort 1759

ESI 0.101 · percentile 27 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.446 days

Semi-major axis

0.0444 AU

Eccentricity

0.120

Inclination

85.60 °

Year Length

A year here lasts approximately 3.45 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0444 AU.

Transit Fingerprint

Depth

1.632 %

Duration

2.417 h

Impact parameter b

0.633

Rp / R★

0.128800

Transit midpoint (BJD)

2,455,241.2872

Photometric dip

Transit produces a flux drop of 16,321 ppm lasting ≈ 2.42 h.

Extended Orbital Architecture

Planet / star radius ratio

0.128800

Semi-major axis / stellar radius

9.200

Impact parameter (b)

0.633

RV semi-amplitude (K)

254.100 m/s

Transit mid-time (BJD)

2,455,241.2872

Long. of periastron (ω)

18.00°

Angular separation (arcsec)

0.15600

Eq. Temperature

1,359K

(1086 °C)

Insolation (S⊕)

489.95

Earth = 1.00

Earth Similarity (ESI)

0.101

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

Penev et al. 2013

Instrument

Apogee 4K CCD Sensor

Publication

2013-01

Observation locale

Ground

Host System: HATS-1

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,870 K — hotter than the Sun (5,778 K)

Estimated Age

6.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.038 R☉

Stellar Mass

0.986 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

2.185 g/cm³

Systemic radial velocity

-10.44 km/s

Rotational v·sin i

2.52 km/s

Metallicity ratio

[Fe/H]

Distance

283.97 parsec

Light-years 926.19 ly

V-band magnitude

12.16 mag

Voyager-speed travel 16,333,332 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.493 mas

Total Proper Motion

20.378 mas/yr

PM Right Ascension

-20.36 mas/yr

PM Declination

-0.92 mas/yr

Galactic Cartesian (pc)

x = -0.915 · y = 0.072 · z = -0.396

Equatorial (J2000)

RA 175.52524° · Dec -23.35485°

Galactic ℓ, b

282.954° · 36.812°

Ecliptic λ, β

185.734° · -23.092°

HTM-20 index

1739985348