109 Virginis
Star in the constellation Virgo
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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]
Chart of Virgo; 109 Virginis forms the Virgin's right foot | |
| 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 |
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]
109 Virginis was the brightest star in the obsolete constellation Mons Maenalus.[14]
Notes
- 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:
