Nu Virginis
ν Virginis, Latinized as Nu Virginis, is a single star in the zodiac constellation of Virgo, located at the western tip of the classic constellation and nearly due south of the prominent star Denebola. It is a red-hued star with an apparent visual magnitude of 4.04 and can be seen with the naked eye. Because the star lies near the ecliptic it is subject to occultations by the Moon. Parallax measurements provide an estimated distance of around 294 light years from the Sun, and it is drifting further away with a radial velocity of +50 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 11h 45m 51.55957s |
| Declination | +06° 31′ 45.7413″ |
| Apparent magnitude (V) | 4.04 |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch |
| Spectral type | M1 III |
| U−B color index | +1.80 |
| B−V color index | +1.52 |
| Astrometry | |
| Radial velocity (Rv) | 50.19±0.30 km/s |
| Proper motion (μ) | RA: −18.96 mas/yr Dec.: −181.56 mas/yr |
| Parallax (π) | 11.10 ± 0.18 mas |
| Distance | 294 ± 5 ly (90 ± 1 pc) |
| Absolute magnitude (MV) | −0.87 |
| Details | |
| Mass | 1.6 M☉ |
| Radius | 54 R☉ |
| Luminosity | 631 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 4,009 K |
| Metallicity [Fe/H] | 0.06 dex |
| Rotational velocity (v sin i) | 3.8 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an M-type red giant, currently on the asymptotic giant branch, with a stellar classification of M1 III. It is an SRB-type semiregular variable star with its brightness varying by 0.0125 in magnitude. These variations have four periods lasting 11.1, 12.3, 16.8, and 23.7 days. This star has about 1.6 times the mass of the sun, but it has expanded to 54 times the Sun's radius and shines 631 times as brightly as the Sun. The effective temperature of its outer atmosphere is 4,009 K.