HATS-3

HATS-3 is an F-type main-sequence star 1,380 light-years (420 parsecs) away. Its surface temperature is 6351±76 K. HATS-3 is relatively depleted in its concentration of heavy elements, with a metallicity Fe/H index of −0.157±0.07, but is slightly younger than the Sun at an age of 3.2^+0.6
_−0.4 billion years.^[4]

HATS-3

Observation data Epoch J2000      Equinox J2000
Constellation	Capricornus[1]
Right ascension	20h 49m 49.78530s[2]
Declination	−24° 25′ 43.5378″[2]
Apparent magnitude (V)	12.43[3]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	F[4]
Astrometry
Radial velocity (Rv)	−22.07±0.83[2] km/s
Proper motion (μ)	RA: 10.393 mas/yr[2] Dec.: 15.478 mas/yr[2]
Parallax (π)	2.3595±0.0171 mas[2]
Distance	1,380 ± 10 ly (424 ± 3 pc)
Details[5]
Mass	1.210±0.040 M☉
Radius	1.400±0.030 R☉
Surface gravity (log g)	4.22±0.01[4] cgs
Temperature	6351±76 K
Metallicity [Fe/H]	−0.157±0.070 dex
Rotational velocity (v sin i)	9.1±1.3 km/s
Age	3.20+0.60 −0.40 Gyr
Other designations
HATS-3, TOI-103, TIC 336732616, TYC 6926-454-1, GSC 06926-00454, 2MASS J20494978-2425436[3]
Database references
SIMBAD	data

A multiplicity survey in 2016 detected a candidate stellar companion to HATS-3, 3.671±0.016 arc-seconds away.^[6]

Planetary system

In 2013, one planet, named HATS-3b, was discovered on a tight, nearly circular orbit.^[4] The planetary orbit of HATS-3b is likely aligned with the equatorial plane of the star, at a misalignment angle of 3±25°.^[7] The planetary equilibrium temperature is 1643 K.^[4]

The HATS-3 planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	1.10+0.18 −0.19 MJ	0.04852+0.00053 −0.00054	3.5478510(50)	<0.30	86.20±0.30°	1.381±0.035 RJ