S Canis Minoris
{{Short description|Variable star in the constellation Canis Minor}}{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = The visual band light curve of S Canis Minoris, from AAVSO data
}}
{{Starbox observe
| constell = Canis Minor
| epoch = J2000
| dec = {{DEC|+08|19|05.1975}}
}}
{{Starbox character
| type = AGB
| variable = Mira variable
}}
{{Starbox astrometry
| prop_mo_ra = −10.785
| prop_mo_dec = −12.827
| parallax = 2.440
| p_error = 0.098
| absmag_v =
}}
{{Starbox detail
| source =
| luminosity = {{val|6174|402|378|fmt=commas}}
| temperature = 2,854{{snd}}2,872
| rotational_velocity =
| gravity = {{val|-0.46}} to {{Val|-0.51}}
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | BD=+08°1800 | V=S CMi | HD=59950 | HIP=36675 | SAO=115591 | AAVSO=0727+08 }}
}}
{{Starbox reference
| Simbad = S+CMi
}}
{{Starbox end}}
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 1,340 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of about +68 km/s.
In 1856, John Russell Hind discovered that S Canis Minoris is a variable star. This is an aging red giant star with a stellar classification of M7-8e, where the 'e' suffix indicates emission lines in the spectrum. It is a Mira-type long period variable that varies by an amplitude of 4.27 in visual magnitude over a period of {{Val|327.77|2.78|u=days}}. Evidence has been found of asymmetry in this star, suggesting a non-spherical shape. Abundance-wise, it is an oxygen-rich giant and the emission feature is of the oxygen-rich silicate class as it sheds silicate dust from its atmosphere. The star is shedding mass at the rate of {{Val|4.9|e=−8|ul=solar mass|up=yr}}.
References
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}}
{{Stars of Canis Minor}}
{{DEFAULTSORT:S Canis Minoris}}