Sigma Virginis
Sigma Virginis (σ Vir, σ Virginis) is a star in the zodiac constellation of Virgo. It can be faintly seen with the naked eye with a baseline apparent visual magnitude of 4.86. Based upon parallax measurements, the distance to this star is roughly 680 light-years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 17m 36.28327s |
| Declination | +05° 28′ 11.5221″ |
| Apparent magnitude (V) | 4.86 |
| Characteristics | |
| Spectral type | M1 III |
| U−B color index | +1.86 |
| B−V color index | +1.62 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −28.26±0.30 km/s |
| Proper motion (μ) | RA: −6.06 mas/yr Dec.: +9.14 mas/yr |
| Parallax (π) | 4.83 ± 0.19 mas |
| Distance | 680 ± 30 ly (207 ± 8 pc) |
| Absolute magnitude (MV) | −1.80 |
| Details | |
| Radius | 98 R☉ |
| Luminosity | 1,610 L☉ |
| Surface gravity (log g) | 0.42 cgs |
| Temperature | 3,690 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved red giant star with a stellar classification of M1 III. It is a suspected variable star with a brightness that ranges from magnitude +4.77 to +4.86. This variation has pulsation periods of 23.4, 24.3, 27.9 and 34.1 days. The effective temperature of the stellar atmosphere is around 3,800 K, and it shines with 1,734 times the luminosity of the Sun.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.