Key parameters at a glance

A radius of 7.76 Earth radii
A mass of 759.61 Earth masses
Surface gravity around 12.61 g
An orbital period of 3.143 days
Semi-major axis 0.0441 AU
Equilibrium temperature 1,446 K (1173 °C)
Distance from Earth 2,433.57 light-years
Earth Similarity Index 0.097
Travel time at Voyager 1 speed 42,916,073 years

HATS-12 b Planet Profile

Physical Specs

Radius

7.76 R⊕

Radius (Jupiter)

0.692 R♃

Mass

759.61 M⊕

Mass (Jupiter)

2.390 M♃

Density

1.12 g/cm³

Surface Gravity

12.61 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.097

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#162of 574

top 28.0%

This planet

7.76R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

OGLE-2012-BLG-0026L b 7.72 R⊕ Kepler-489 b 7.72 R⊕ KOI-351 g 7.72 R⊕

Metric	Earth	HATS-12 b	Jupiter
Radius (R⊕)	1.00	7.76	11.21
Mass (M⊕)	1.00	759.61	317.83
Density (g/cm³)	5.51	1.12	1.33
Surface Gravity (g)	1.00	12.61	2.53
Insolation (S⊕)	1.00	566.48	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	759.614 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 11270200

Gaia DR2

Gaia DR2 4083840142695803520

Gaia DR3

Gaia DR3 4083840142695803520

System

HATS-12

Percentile among Neptune-like cohort

Radius 7.760 R⊕ · percentile 72 / cohort 574

Mass 759.614 M⊕ · percentile 97 / cohort 574

Orbital period 3.14 d · percentile 4 / cohort 524

Distance 746.14 pc · percentile 65 / cohort 572

ESI 0.097 · percentile 3 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

3.143 days

Semi-major axis

0.0441 AU

Eccentricity

0.085

Inclination

82.27 °

Year Length

A year here lasts approximately 3.14 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0441 AU.

Transit Fingerprint

Depth

0.429 %

Duration

4.524 h

Impact parameter b

0.430

Rp / R★

0.060600

Transit midpoint (BJD)

2,457,311.2388

Photometric dip

Transit produces a flux drop of 4,291 ppm lasting ≈ 4.52 h.

Extended Orbital Architecture

Planet / star radius ratio

0.060600

Semi-major axis / stellar radius

5.200

Impact parameter (b)

0.430

RV semi-amplitude (K)

250.600 m/s

Transit mid-time (BJD)

2,457,311.2388

Angular separation (arcsec)

0.05910

Eq. Temperature

1,446K

(1173 °C)

Insolation (S⊕)

566.48

Earth = 1.00

Earth Similarity (ESI)

0.097

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

Rabus et al. 2016

Instrument

Apogee 4K CCD Sensor

Publication

2016-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at HATSouth (12 shown).

HATS-17 b · Neptune-like HATS-15 b · Gas Giant HATS-28 b · Gas Giant HATS-29 b · Gas Giant HATS-25 b · Gas Giant HATS-33 b · Gas Giant HATS-16 b · Gas Giant HATS-30 b · Gas Giant HATS-32 b · Gas Giant HATS-34 b · Gas Giant HATS-11 b · Gas Giant HATS-27 b · Gas Giant

Host System: HATS-12

Spectral Class

F-type yellow-white

Effective Temperature

6,357 K — hotter than the Sun (5,778 K)

Estimated Age

2.36 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.170 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.269 g/cm³

Systemic radial velocity

-21.66 km/s

Rotational v·sin i

6.57 km/s

Metallicity ratio

[Fe/H]

Distance

746.14 parsec

Light-years 2,433.57 ly

V-band magnitude

12.83 mag

Voyager-speed travel 42,916,073 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

2.673 mas

Total Proper Motion

18.039 mas/yr

PM Right Ascension

12.25 mas/yr

PM Declination

13.24 mas/yr

Galactic Cartesian (pc)

x = 0.310 · y = -0.891 · z = -0.331

Equatorial (J2000)

RA 289.20240° · Dec -19.35592°

Galactic ℓ, b

18.149° · -14.117°

Ecliptic λ, β

288.098° · 2.885°

HTM-20 index

76608580