S Carinae (HD 88366) is a variable star in the constellation Carina.

S Carinae

The visual band light curve of S Carinae, from AAVSO data[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Carina
Right ascension	10h 09m 21.894s[2]
Declination	−61° 32′ 56.43″[2]
Apparent magnitude (V)	4.5 - 10.0[3]
Characteristics
Evolutionary stage	AGB[4]
Spectral type	K5e - M6e[3]
U−B color index	+0.93 to +1.93[5]
B−V color index	+1.43 to +2.60[5]
Variable type	Mira[3]
Astrometry
Radial velocity (Rv)	289.30[6] km/s
Proper motion (μ)	RA: −94.237[2] mas/yr Dec.: 76.811[2] mas/yr
Parallax (π)	2.0110 ± 0.0855 mas[2]
Distance	1,620 ± 70 ly (500 ± 20 pc)
Absolute magnitude (MV)	−0.71 to −3.41[7]
Details
Mass	0.6[8] M☉
Radius	120[8] R☉
Luminosity	2,200[5] L☉
Surface gravity (log g)	−0.9 - 1.0[9] cgs
Temperature	3,050 - 3,590[9] K
Other designations
HR 3999, HD 88366, CP−60°1701, HIP 49751, SAO 250840, GC 13971
Database references
SIMBAD	data

S Carinae is an M-type red giant with a mean apparent magnitude of +6.94. It is approximately 1,620 light years from Earth. It is classified as a Mira type variable star and its brightness varies between magnitude +4.5 and +10.0 with a period of 149.49 days.[3] It has one of the earliest spectral types, and hence the hottest temperatures, of any Mira variable, and has a relatively short period for the class.[10] It is a pulsating star, with the temperature being highest at maximum visual brightness and lowest at the visual minimum.[9]

S Carinae has exhausted its core hydrogen and expanded to become a red giant. It has also exhausted its core helium and evolved to the asymptotic giant branch, where it fuses hydrogen and helium in separate shells outside the core.[10][4]

References

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