HD 90853

This article is about s Carinae. For S Carinae, see HD 88366.

HD 90853 is a single^[9] star in the southern constellation Carina. It has the Bayer designation s Carinae, while HD 90853 is the identifier from the Henry Draper catalogue. This is a variable star with an apparent visual magnitude that ranges from 3.36 down to 3.51,^[10] and thus is bright enough to be visible to the naked eye. It is located at a distance of approximately 1,340 light-years from the Sun based on parallax, and has an absolute magnitude of −4.44.^[2] The star is drifting further away with a radial velocity of +9 km/s.^[2]

HD 90853

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Carina
Right ascension	10h 27m 52.72877s[1]
Declination	−58° 44′ 21.8507″[1]
Apparent magnitude (V)	3.81[2]
Characteristics
Spectral type	F2II[3] or F0Ib[4]
B−V color index	0.317±0.019[2]
Astrometry
Radial velocity (Rv)	+9.4±0.7[2] km/s
Proper motion (μ)	RA: −14.47[1] mas/yr Dec.: +2.36[1] mas/yr
Parallax (π)	2.43±0.12 mas[1]
Distance	1,340 ± 70 ly (410 ± 20 pc)
Absolute magnitude (MV)	−4.44[2]
Details
Mass	7.00±0.55[5] M☉
Radius	45.05+3.74 −4.03[6] R☉
Luminosity	3,466±392[6] L☉
Surface gravity (log g)	1.50[7] cgs
Temperature	6,598+317 −258[6] K
Metallicity [Fe/H]	−0.37[7][2] dex
Rotational velocity (v sin i)	22.0[7] km/s
Age	100[7] Myr
Other designations
s Car, NSV 4869, AAVSO 1024-58C, CD−58°2227, FK5 393, GC 14388, HD 90853, HIP 51232, HR 4114, SAO 238085[8]
Database references
SIMBAD	data

This is an aging bright giant or supergiant star that has been assigned stellar classifications of F2II^[3] and F0Ib,^[4] respectively. It has seven^[5] times the mass of the Sun and has expanded to 45^[6] times the Sun's radius. It is spinning with a projected rotational velocity of 22 km/s.^[7] The star is radiating 3,466^[6] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,598 K.^[6]