HD 76728

This article is about c Carinae. For C Carinae, see HD 69863.

HD 76728 is a suspected astrometric binary^[7] star system in the constellation Carina. It has the Bayer designation c Carinae; HD 76728 is the identifier from the Henry Draper catalogue. The visible component has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.84.^[2] The system is located at a distance of approximately 320 light years from the Sun based on parallax,^[1] and it is drifting further away with a radial velocity of around +25 km/s.^[2] It is a candidate member of the Volans-Carina Association of co-moving stars.^[8]

HD 76728

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Carina
Right ascension	08h 55m 02.82822s[1]
Declination	−60° 38′ 40.5998″[1]
Apparent magnitude (V)	+3.84[2]
Characteristics
Evolutionary stage	Bright giant
Spectral type	B8/9II[3]
B−V color index	−0.104±0.006[2]
Variable type	Constant[4]
Astrometry
Radial velocity (Rv)	+25.0±4.1[2] km/s
Proper motion (μ)	RA: −28.18[1] mas/yr Dec.: +41.48[1] mas/yr
Parallax (π)	10.20±0.10 mas[1]
Distance	320 ± 3 ly (98.0 ± 1.0 pc)
Absolute magnitude (MV)	−1.12[2]
Details
Radius	4.057[5] R☉
Luminosity	446[5] L☉
Temperature	13,180[5] K
Other designations
c Car, CD−60°1243, FK5 336, GC 12359, HD 76728, HIP 43783, HR 3571, SAO 250374, CCDM J08550-6039, WDS J08550-6039A[6]
Database references
SIMBAD	data

The visible component is an aging bright giant star with a stellar classification of B8/9II.^[3] The spectrum of the star displays metallic lines of magnesium.^[9] The Volans-Carina Association to which it belongs has an age of 90 million years.^[8] The star has four times the radius of the Sun and is radiating 450 times the Sun's luminosity from its photosphere at an effective temperature of 13,180 K.^[5]