109 Virginis

109 Virginis is a single,^[9] white-hued star in the zodiac constellation of Virgo, located some 134.5 light years away from Earth.^[1] It is the seventh-brightest member of this constellation, having an apparent visual magnitude of +3.72.^[2]

109 Virginis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Virgo
Right ascension	14h 46m 14.92345s[1]
Declination	+01° 53′ 34.3818″[1]
Apparent magnitude (V)	+3.72[2]
Characteristics
Spectral type	A0 V[3]
B−V color index	−0.005±0.006[4]
Variable type	None[5]
Astrometry
Radial velocity (Rv)	−6.1±2.7[4] km/s
Proper motion (μ)	RA: −115.08 mas/yr[1] Dec.: −20.464 mas/yr[1]
Parallax (π)	24.2814±0.2271 mas[1]
Distance	134 ± 1 ly (41.2 ± 0.4 pc)
Details
Mass	2.40[6] M☉
Radius	2.57[6][a] R☉
Luminosity	46.8±1.1[6] L☉
Surface gravity (log g)	3.83±0.12[7] cgs
Temperature	9,420±130[6] K
Metallicity [Fe/H]	−0.41±0.14[7] dex
Rotational velocity (v sin i)	285[8] km/s
Age	320[9] Myr
Other designations
109 Vir, BD+02°2862, FK5 547, HD 130109, HIP 72220, HR 5511, SAO 120648[10]
Database references
SIMBAD	data

Chart of Virgo; 109 Virginis forms the Virgin's right foot.

This is an A-type main-sequence star with a stellar classification of A0 V,^[3] and is a suspected chemically peculiar star.^[8][11] However, Abt and Morrell (1995) gave it a class of A0 IIInn,^[12] matching a giant star with "nebulous" lines. It is spinning rapidly with a projected rotational velocity of 285 km/s,^[8] which is giving the star an oblate shape with an equatorial bulge that is an estimated 31% larger than the polar radius.^[13] The star is 320^[9] million years old with 2.4 times the mass of the Sun and about 2.57 times the Sun's radius.^[a] It is radiating 47 times the Sun's luminosity from its photosphere at an effective temperature of 9,420 K.^[6]

Notes

1. Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:$${\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10^{3.974}}}{\biggr )}^{4}\cdot 10^{1.67}}}=2.57\ R_{\odot }.}$$