109 Virginis
Star in the constellation Virgo
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109 Virginis, also named Maenalus,[11] is a single,[9] white-hued star in the zodiac constellation of Virgo, located some 134.5 light years away from Earth.[2] It is the seventh-brightest member of this constellation, having an apparent visual magnitude of +3.72.[3]
Chart of Virgo; 109 Virginis forms the Virgin's right foot | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Virgo[1] |
| Right ascension | 14h 46m 14.92345s[2] |
| Declination | +01° 53â² 34.3818â³[2] |
| Apparent magnitude (V) | +3.72[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A0 V[5] |
| BâV color index | â0.005±0.006[1] |
| Variable type | None[6] |
| Astrometry | |
| Radial velocity (Rv) | â6.1±2.7[1] km/s |
| Proper motion (μ) | RA: â115.08 mas/yr[2] Dec.: â20.464 mas/yr[2] |
| Parallax (Ï) | 24.2814±0.2271 mas[2] |
| Distance | 134 ± 1 ly (41.2 ± 0.4 pc) |
| Details | |
| Mass | 2.40[7] Mâ |
| Radius | 2.57[7][a] Râ |
| Luminosity | 46.8±1.1[7] Lâ |
| Surface gravity (log g) | 3.83±0.12[8] cgs |
| Temperature | 9,420±130[7] K |
| Metallicity [Fe/H] | â0.41±0.14[8] dex |
| Rotational velocity (v sin i) | 285[4] km/s |
| Age | 320[9] Myr |
| Other designations | |
| Maenalus, 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,[5] and is a suspected chemically peculiar star.[4][12] However, Abt and Morrell (1995) gave it a class of A0 IIInn,[13] matching a giant star with "nebulous" lines. It is spinning rapidly with a projected rotational velocity of 285 km/s,[4] which is giving the star an oblate shape with an equatorial bulge that is an estimated 31% larger than the polar radius.[14] 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.[7]
109 Virginis was the brightest star in the obsolete constellation Mons Maenalus, representing a mountain in the Peloponnese, Greece.[15] The IAU Working Group on Star Names approved the name Maenalus for 109 Virginis on 15 April 2026, after the obsolete constellation.[11]
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:
