9 Lacertae

9 Lacertae is a single^[9] star in the northern constellation Lacerta, located 172 light years away from Sun.^[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.64.^[2] This object is moving further from the Earth with a heliocentric radial velocity of +10 km/s.^[2]

9 Lacertae

Location of 9 Lacertae (circled in red)
Observation data Epoch J2000      Equinox J2000
Constellation	Lacerta
Right ascension	22h 37m 22.41727s[1]
Declination	+51° 32′ 42.4383″[1]
Apparent magnitude (V)	4.64[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	A9VkA7mA6[4]
B−V color index	0.254±0.006[2]
Astrometry
Radial velocity (Rv)	+10.1±1.5[2] km/s
Proper motion (μ)	RA: −51.83[1] mas/yr Dec.: −103.80[1] mas/yr
Parallax (π)	19.00±0.19 mas[1]
Distance	172 ± 2 ly (52.6 ± 0.5 pc)
Absolute magnitude (MV)	1.03[2]
Details
Mass	1.71[5] M☉
Radius	3.28[5] R☉
Luminosity	30[5] L☉
Surface gravity (log g)	3.64[5] cgs
Temperature	7,464[5] K
Metallicity [Fe/H]	−0.20[6] dex
Rotational velocity (v sin i)	105[3] km/s
Age	513[7] Myr
Other designations
9 Lac, BD+50°3770, HD 214454, HIP 111674, HR 8613, SAO 34628[8]
Database references
SIMBAD	data

This is an A-type main-sequence star with a stellar classification of A9VkA7mA6.^[4] This notation indicates it has the Hydrogen lines of an A9 star, the Calcium K line of an A7 star, and the metal lines of an A6. It is 513^[7] million years old with a high projected rotational velocity of 105 km/s.^[3] The star has 1.7 times the mass of the Sun and about 3.3 times the Sun's radius. It is radiating 30 times the Sun's luminosity from its photosphere at an effective temperature of 7464 K.^[5]