SS Virginis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 25m 14.3952s |
| Declination | +00° 46′ 10.9467″ |
| Apparent magnitude (V) | 6.0 - 9.6 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | C63e (Ne) |
| Variable type | SRa |
| Astrometry | |
| Radial velocity (Rv) | 2 km/s |
| Proper motion (μ) | RA: −1.448±0.228 mas/yr Dec.: 0.571±0.151 mas/yr |
| Parallax (π) | 1.4348±0.1018 mas |
| Distance | 2,300 ± 200 ly (700 ± 50 pc) |
| Details | |
| Mass | 3.2 M☉ |
| Radius | 500 R☉ |
| Luminosity | 5,400 L☉ |
| Surface gravity (log g) | 1.86 cgs |
| Temperature | 2,445 K |
| Metallicity [Fe/H] | −0.38 dex |
| Other designations | |
| SS Vir, BD+01°2694, HD 108105, HIP 120212, TYC 282-753-1 | |
| Database references | |
| SIMBAD | data |
SS Virginis is a semiregular variable star that appears with a strong red hue. It varies in apparent magnitude from a maximum of 6.0 to a minimum of 9.6 over a typical period of 361 days. Its spectral class is C63e, indicating that SS Virginis is a carbon star. SS Virginis has a hydrogen-alpha emission line that varies widely, synchronized with the overall variations in light. The line becomes far more prominent as the star becomes brighter. Observations made in the near-infrared spectrum indicate that it has a radius of 500 solar radii, and its temperature is between 2,405 and 2,485 K.
The location of SS Virginis is two degrees north-following of η Virginis.