Key parameters at a glance

A radius of 6.79 Earth radii
A mass of 31.47 Earth masses
Surface gravity around 0.68 g
An orbital period of 4.332 days
Semi-major axis 0.0491 AU
Equilibrium temperature 1,085 K (812 °C)
Distance from Earth 691.11 light-years
Earth Similarity Index 0.143
Travel time at Voyager 1 speed 12,187,751 years

HATS-37 A b Planet Profile

Physical Specs

Radius

6.79 R⊕

Radius (Jupiter)

0.606 R♃

Mass

31.47 M⊕

Mass (Jupiter)

0.099 M♃

Density

0.55 g/cm³

Surface Gravity

0.68 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.143

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility HATSouth

Telescope 0.18 m Takahashi Epsilon Astrograph

Size rank in cohort

Rank by radius

#222of 574

top 38.5%

This planet

6.79R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

OGLE-2019-BLG-1492L b 6.79 R⊕ TOI-4600 b 6.80 R⊕ Kepler-857 b 6.80 R⊕

Metric	Earth	HATS-37 A b	Jupiter
Radius (R⊕)	1.00	6.79	11.21
Mass (M⊕)	1.00	31.47	317.83
Density (g/cm³)	5.51	0.55	1.33
Surface Gravity (g)	1.00	0.68	2.53
Insolation (S⊕)	1.00	229.70	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	31.465 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 6036597

Gaia DR2

Gaia DR2 6194574671813047424

Gaia DR3

Gaia DR3 6194574671813047424

System

HATS-37

Percentile among Neptune-like cohort

Radius 6.793 R⊕ · percentile 61 / cohort 574

Mass 31.465 M⊕ · percentile 52 / cohort 574

Orbital period 4.33 d · percentile 16 / cohort 524

Distance 211.90 pc · percentile 40 / cohort 572

ESI 0.143 · percentile 11 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

4.332 days

Semi-major axis

0.0491 AU

Eccentricity

0.000

Inclination

89.33 °

Year Length

A year here lasts approximately 4.33 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0491 AU.

Transit Fingerprint

Duration

2.914 h

Impact parameter b

0.140

Rp / R★

0.070700

Transit midpoint (BJD)

2,458,006.8015

Extended Orbital Architecture

Planet / star radius ratio

0.070700

Semi-major axis / stellar radius

12.050

Impact parameter (b)

0.140

RV semi-amplitude (K)

13.900 m/s

Transit mid-time (BJD)

2,458,006.8015

Angular separation (arcsec)

0.23200

Eq. Temperature

1,085K

(812 °C)

Insolation (S⊕)

229.70

Earth = 1.00

Earth Similarity (ESI)

0.143

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

Jord Aacute N et al. 2020

Instrument

Apogee 4K CCD Sensor

Publication

2020-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at HATSouth (6 shown).

HATS-71 b · Gas Giant HATS-49 b · Neptune-like HATS-72 b · Neptune-like HATS-48 A b · Neptune-like HATS-47 b · Gas Giant HATS-38 b · Neptune-like

Host System: HATS-37 A

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,326 K — cooler than the Sun (5,778 K)

Estimated Age

11.46 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.877 R☉

Stellar Mass

0.843 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.478 dex

Stellar density

0.867 g/cm³

Systemic radial velocity

6.42 km/s

Rotational v·sin i

3.98 km/s

Metallicity ratio

[Fe/H]

Distance

211.90 parsec

Light-years 691.11 ly

V-band magnitude

12.34 mag

Voyager-speed travel 12,187,751 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

4.692 mas

Total Proper Motion

22.637 mas/yr

PM Right Ascension

-21.78 mas/yr

PM Declination

6.15 mas/yr

Galactic Cartesian (pc)

x = -0.866 · y = -0.312 · z = -0.391

Equatorial (J2000)

RA 199.80183° · Dec -22.98684°

Galactic ℓ, b

311.216° · 39.438°

Ecliptic λ, β

207.004° · -13.547°

HTM-20 index

1266950995