| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo [2] |
| Right ascension | 12h 25m 14.3952s [3] |
| Declination | +00° 46′ 10.9467″ [3] |
| Apparent magnitude (V) | 6.0 - 9.6 [4] |
| Characteristics | |
| Evolutionary stage | AGB [5] |
| Spectral type | C63e (Ne) [4] |
| Variable type | SRa [4] |
| Astrometry | |
| Radial velocity (Rv) | 2 [6] km/s |
| Proper motion (μ) | RA: −1.448±0.228 [3] mas/yr Dec.: 0.571±0.151 [3] mas/yr |
| Parallax (π) | 1.4348±0.1018 mas [3] |
| Distance | 2,300 ± 200 ly (700 ± 50 pc) |
| Details | |
| Mass | 3.2 [7] M☉ |
| Radius | 500 [8] R☉ |
| Luminosity | 5,400 [9] L☉ |
| Surface gravity (log g) | 1.86 [7] cgs |
| Temperature | 2,445 [8] K |
| Metallicity [Fe/H] | −0.38 [7] dex |
| Other designations | |
| SS Vir, BD+01°2694, HD 108105, HIP 120212, TYC 282-753-1 [10] | |
| 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. Max Wolf and Gisela Wolf announced the discovery of this star, from photographs taken at Heidelburg Observatory in 1905. [11] 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. [12] 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 . [8]
The location of SS Virginis is two degrees north-following of η Virginis.
