Key parameters at a glance

A radius of 14.41 Earth radii
A mass of 222.48 Earth masses
Surface gravity around 1.07 g
An orbital period of 4.188 days
Semi-major axis 0.0551 AU
Equilibrium temperature 1,518 K (1245 °C)
Distance from Earth 2,518.28 light-years
Earth Similarity Index 0.076
Travel time at Voyager 1 speed 44,409,920 years

HATS-45 b Planet Profile

Physical Specs

Radius

14.41 R⊕

Radius (Jupiter)

1.286 R♃

Mass

222.48 M⊕

Mass (Jupiter)

0.700 M♃

Density

0.41 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.076

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#288of 1771

top 16.2%

This planet

14.41R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-157 b 14.41 R⊕ Kepler-485 b 14.41 R⊕ Qatar-8 b 14.40 R⊕

Metric	Earth	HATS-45 b	Jupiter
Radius (R⊕)	1.00	14.41	11.21
Mass (M⊕)	1.00	222.48	317.83
Density (g/cm³)	5.51	0.41	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	811.35	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	222.481 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 4616072

Gaia DR2

Gaia DR2 2926039005480063616

Gaia DR3

Gaia DR3 2926039005480063616

System

HATS-45

Percentile among Gas Giant cohort

Radius 14.415 R⊕ · percentile 84 / cohort 1771

Mass 222.481 M⊕ · percentile 23 / cohort 1747

Orbital period 4.19 d · percentile 31 / cohort 1533

Distance 772.11 pc · percentile 83 / cohort 1759

ESI 0.076 · percentile 16 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.188 days

Semi-major axis

0.0551 AU

Eccentricity

0.240

Inclination

85.61 °

Year Length

A year here lasts approximately 4.19 Earth days (1.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0551 AU.

Transit Fingerprint

Depth

1.091 %

Duration

3.046 h

Impact parameter b

0.689

Rp / R★

0.100400

Transit midpoint (BJD)

2,456,731.1953

Photometric dip

Transit produces a flux drop of 10,906 ppm lasting ≈ 3.05 h.

Extended Orbital Architecture

Planet / star radius ratio

0.100400

Semi-major axis / stellar radius

9.020

Impact parameter (b)

0.689

RV semi-amplitude (K)

75.000 m/s

Transit mid-time (BJD)

2,456,731.1953

Angular separation (arcsec)

0.07140

Eq. Temperature

1,518K

(1245 °C)

Insolation (S⊕)

811.35

Earth = 1.00

Earth Similarity (ESI)

0.076

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

Brahm et al. 2018

Instrument

Apogee 4K CCD Sensor

Publication

2018-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at HATSouth (12 shown).

HATS-59 c · Gas Giant HATS-36 b · Gas Giant HATS-61 b · Gas Giant HATS-59 b · Gas Giant HATS-46 b · Gas Giant HATS-44 b · Gas Giant HATS-43 b · Gas Giant HATS-69 b · Gas Giant HATS-63 b · Gas Giant HATS-41 b · Gas Giant HATS-60 b · Gas Giant HATS-68 b · Gas Giant

Host System: HATS-45

Spectral Class

F-type yellow-white

Effective Temperature

6,450 K — hotter than the Sun (5,778 K)

Estimated Age

1.52 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.315 R☉

Stellar Mass

1.272 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.305 dex

Stellar density

0.790 g/cm³

Systemic radial velocity

19.42 km/s

Rotational v·sin i

9.90 km/s

Metallicity ratio

[Fe/H]

Distance

772.11 parsec

Light-years 2,518.28 ly

V-band magnitude

13.33 mag

Voyager-speed travel 44,409,920 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.267 mas

Total Proper Motion

4.867 mas/yr

PM Right Ascension

-3.18 mas/yr

PM Declination

3.68 mas/yr

Galactic Cartesian (pc)

x = -0.193 · y = 0.908 · z = -0.373

Equatorial (J2000)

RA 101.99425° · Dec -21.91071°

Galactic ℓ, b

232.279° · -10.523°

Ecliptic λ, β

105.734° · -44.697°

HTM-20 index

389617463