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HD 96919

V371 Carinae

Location of V371 Carinae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Carina
Right ascension	11h08m 33.99848s[1]
Declination	−61° 56′ 49.8316″[1]
Apparent magnitude (V)	5.19[2] (5.12 - 5.19[3])
Characteristics
Spectral type	B9 Iae[4]
U−B color index	−0.46[2]
B−V color index	+0.23[2]
Variable type	α Cyg[3]
Astrometry
Radial velocity (Rv)	−22.4 ± 2[5] km/s
Proper motion (μ)	RA: −5.78[1] mas/yr Dec.: 1.74[1] mas/yr
Parallax (π)	0.23 ± 0.25 mas[1]
Distance	1,920[6] pc
Absolute magnitude (MV)	−7.0[6]
Details
Mass	23[4] M☉
Radius	141[4] R☉
Luminosity	105,000[7] L☉
Surface gravity (log g)	1.50[4] cgs
Temperature	12,500[7] K
Rotational velocity (v sin i)	60[4] km/s
Other designations
z2 Carinae, V371 Carinae, 261 G. Carinae,[8] CD−61°2941, CPD−61°2075, CPC 20.1 3080, FK5 2891, GC 15331, GCRV 6856, GSC 08962-02640, HD 96919, HIC 54461, HIP 54461, HR 4338, PPM 358516, SAO 251286
Database references
SIMBAD	data

HD 96919, also known by its Bayer designationofz² Carinae and the variable star designationofV371 Carinae, is a blue supergiant star in the constellation Carina. It lies near the Carina Nebula and at a comparable distance.

V371 Car is an α Cyg variable, erratically pulsating and changing brightness by a few hundredths of a magnitude. Periods of 10–80 days have been identified.^[7] It shows unusual emission lines in its spectrum, and high-velocity absorption (HVA) events, temporary spectral features that are thought to indicate localised regions of enhanced mass loss.^[10]

HD 96919 is a B9 supergiant, possibly located 6,000 light-years from Earth. It is considered to be a post-red supergiant star, either evolving towards a Wolf–Rayet star or on a blue loop before returning to a cooler temperature.^[7]

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