SS Virginis

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.^[11] 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]

SS Virginis

The visual band light curve of SS Virginis, from AAVSO data[1]
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

The location of SS Virginis is two degrees north-following of η Virginis.