Lambda Virginis
Lambda Virginis (λ Virginis, abbreviated Lambda Vir, λ Vir) is a binary star system in the zodiac constellation of Virgo. With an apparent visual magnitude of 4.5, it is bright enough to be seen with the naked eye. Based upon parallax measurements, the system is about 173 light-years away from the Sun. Its two components are designated Lambda Virginis A (formally named Khambalia /kæmˈbeɪliə/) and B.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 19m 06.59235s |
| Declination | −13° 22′ 15.9459″ |
| Apparent magnitude (V) | +4.52 (5.00 + 5.63) |
| Characteristics | |
| Spectral type | A1 V (A1V + A1V) |
| U−B color index | +0.12 |
| B−V color index | +0.12 |
| Astrometry | |
| Radial velocity (Rv) | −10.9 km/s |
| Proper motion (μ) | RA: −15.91 mas/yr Dec.: +28.92 mas/yr |
| Parallax (π) | 18.81 ± 0.10 mas |
| Distance | 173.4 ± 0.9 ly (53.2 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.73 |
| Orbit | |
| Period (P) | 206.7321±0.0040 d |
| Semi-major axis (a) | 19.759±0.079 mas |
| Eccentricity (e) | 0.0610±0.0036 |
| Inclination (i) | 109.86±0.24° |
| Longitude of the node (Ω) | 196.40±0.22° |
| Periastron epoch (T) | 53,070.30±0.32 |
| Argument of periastron (ω) (secondary) | 272.28±0.46° |
| Semi-amplitude (K1) (primary) | 24.78±0.17 km/s |
| Semi-amplitude (K2) (secondary) | 27.308±0.067 km/s |
| Details | |
| λ Vir A | |
| Mass | 1.897 M☉ |
| Radius | 2.35 R☉ |
| Luminosity | 20.84±0.25 L☉ |
| Surface gravity (log g) | 3.97 cgs |
| Temperature | 8,280±200 K |
| Metallicity [Fe/H] | 0.0097 dex |
| Rotational velocity (v sin i) | 36±1 km/s |
| Age | 935 Myr |
| λ Vir B | |
| Mass | 1.721 M☉ |
| Radius | 1.84 R☉ |
| Luminosity | 12.58±0.16 L☉ |
| Surface gravity (log g) | 4.14 cgs |
| Temperature | 8,280±200 K |
| Rotational velocity (v sin i) | 10±2 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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