S Canis Minoris is a variable star in the equatorial constellation Canis Minor. It has a peak apparent visual magnitude of 6.5, so not normally visible to the naked eye. The star is located at a distance of approximately 1,360 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of about +68 km/s.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Canis Minor |
Right ascension | 07h 32m 43.06942s[2] |
Declination | 08° 19′ 05.1975″[3] |
Apparent magnitude (V) | 6.5 to 13.7[4] |
Characteristics | |
Evolutionary stage | AGB[5] |
Spectral type | M7-8e[6] |
B−V color index | 1.50±0.51[7] |
Variable type | Mira[8][4] |
Astrometry | |
Radial velocity (Rv) | 68.0±4.8[9] km/s |
Proper motion (μ) | RA: −10.785[2] mas/yr Dec.: −12.827[2] mas/yr |
Parallax (π) | 2.3934 ± 0.0982 mas[2] |
Distance | 1,360 ± 60 ly (420 ± 20 pc) |
Details | |
Mass | 4.5[10] M☉ |
Radius | 710[11] R☉ |
Luminosity | 6,493[12] L☉ |
Surface gravity (log g) | −0.55[10] cgs |
Temperature | 2,813[10] K |
Metallicity [Fe/H] | +0.39[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging red giant star with a stellar classification of M7-8e,[6] where the 'e' suffix indicates emission lines in the spectrum. It is a Mira-type[8] long period variable that varies by an amplitude of 4.27 in visual magnitude over a period of 327.77±2.78 d.[14] Evidence has been found of asymmetry in this star, suggesting a non-spherical shape.[5] Abundance-wise, it is an oxygen-rich[12] giant and the emission feature is of the oxygen-rich silicate class as it sheds silicate dust from its atmosphere.[15] The star is shedding mass at the rate of 4.9×10−8 M☉·yr−1.[5]