HAT-P-9

HAT-P-9 is a magnitude 12 F-type star approximately 1500 light-years away in the constellation Auriga.^[3] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.^[8]

HAT-P-9 / Tevel

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga[1]
Right ascension	07h 20m 40.4565s[2]
Declination	+37° 08′ 26.343″[2]
Apparent magnitude (V)	12.34 ± 0.27[3]
Characteristics
Spectral type	F[4]
Apparent magnitude (B)	12.35 ± 0.23[3]
Apparent magnitude (V)	12.34 ± 0.27[3]
Apparent magnitude (J)	11.274 ± 0.022[3]
Apparent magnitude (H)	11.04 ± 0.03[3]
Apparent magnitude (K)	11.015 ± 0.021[3]
Variable type	planetary transit[4]
Astrometry
Radial velocity (Rv)	20.69±2.27[2] km/s
Proper motion (μ)	RA: −9.796 mas/yr[2] Dec.: −13.029 mas/yr[2]
Parallax (π)	2.1626±0.0140 mas[2]
Distance	1,508 ± 10 ly (462 ± 3 pc)
Details
Mass	1.281+0.057 −0.056[5] M☉
Radius	1.338+0.065 −0.060[5] R☉
Luminosity	2.62+0.26 −0.23[5] L☉
Surface gravity (log g)	4.293+0.033 −0.035[5] cgs
Temperature	6253 ± 84[6] K
Metallicity [Fe/H]	0.16 ± 0.09[6] dex
Rotational velocity (v sin i)	13.4 ± 1.4[6] km/s
Age	1.6+1.8 −1.4[7] Gyr
Other designations
Tevel, TOI-1731, TIC 371234684, TYC 2463-281-1, GSC 02463-00281, 2MASS J07204044+3708263, HAT-P-9[3]
Database references
SIMBAD	data
Exoplanet Archive	data

Naming

The star HAT-P-9 is named Tevel. The name was selected in the NameExoWorlds campaign by Israel, during the 100th anniversary of the IAU. The Hebrew word תֵבֵל tevel means "World" or "Universe".^[9][10]

Planetary system

An exoplanet orbiting the star, HAT-P-9b, was discovered by the transit method on June 26, 2008. This is a low-density hot Jupiter, orbiting its star in just 3.9 days.^[4]

The HAT-P-9 planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Alef	0.749+0.064 −0.063 MJ	0.05287±0.00078	3.92281072(102)	0.084+0.052 −0.047	86.44+0.37 −0.36°	1.393+0.067 −0.065 RJ

See also

• HATNet Project or HAT
• List of extrasolar planets