HAT-P-3

HAT-P-3, is a metal-rich K5 dwarf star located about 441 light-years away in the constellation Ursa Major. At a magnitude of about 11.5 it is not visible to the naked eye but is visible in a small to medium-sized amateur telescope. It is believed to be a relatively young star and has a slightly enhanced level of chromospheric activity.^[7][9]

HAT-P-3 / Dombay

Observation data Epoch J2000      Equinox J2000
Constellation	Ursa Major[1]
Right ascension	13h 44m 22.5937s[2]
Declination	+48° 01′ 43.206″[2]
Apparent magnitude (V)	11.577(67)[3]
Characteristics
Spectral type	K5[4]
Apparent magnitude (B)	12.53(20)[5]
Apparent magnitude (V)	11.577(67)[3]
Apparent magnitude (I)	10.504(79)[3]
Apparent magnitude (J)	9.936(22)[6]
Apparent magnitude (H)	9.542(28)[6]
Apparent magnitude (K)	9.448(25)[6]
Variable type	planetary transit[7]
Astrometry
Radial velocity (Rv)	−23.8±0.1[7] km/s
Proper motion (μ)	RA: −19.619(12) mas/yr[2] Dec.: −23.973(15) mas/yr[2]
Parallax (π)	7.4159±0.0143 mas[2]
Distance	439.8 ± 0.8 ly (134.8 ± 0.3 pc)
Absolute magnitude (MV)	5.87(15)[8]
Details
Mass	0.925+0.031 −0.0134[4] M☉
Radius	0.850+0.021 −0.010[4] R☉
Luminosity	0.435(53)[8] L☉
Surface gravity (log g)	4.58(10)[4] cgs
Temperature	5,190(80)[4] K
Metallicity [Fe/H]	0.24(8)[4] dex
Rotational velocity (v sin i)	1.4(5)[4] km/s
Age	2.9+1.7 −3.7[4] Myr
Other designations
Dombay, TOI-1419, TIC 311035838, TYC 3466-819-1, GSC 03466-00819, 2MASS J13442258+4801432, HAT-P-3[5]
Database references
SIMBAD	data
Exoplanet Archive	data

The star HAT-P-3 is named Dombay. The name was selected in the NameExoWorlds campaign by Russia, during the 100th anniversary of the IAU. Dombay is a resort region in the North Caucasus mountains.^[10][11]

Planetary system

This star is home to the extrasolar planet HAT-P-3b, later named Teberda, discovered by the HATNet Project using the transit method.^[7]

The HAT-P-3 planetary system^[8][12]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Teberda	0.609+0.021 −0.022 MJ	0.03899+0.00062 −0.00065	2.8997360±0.0000020	<0.0100	87.07 ± 0.55°	0.827 ± 0.055 RJ

See also

• List of transiting extrasolar planets