HD 76728
Suspected binary star system in the constellation Carina
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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.[1] The system is located at a distance of approximately 320 light years from the Sun based on parallax,[2] and it is drifting further away with a radial velocity of around +25 km/s.[1] It is a candidate member of the Volans-Carina Association of co-moving stars.[8]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Carina[1] |
| Right ascension | 08h 55m 02.82822s[2] |
| Declination | −60° 38′ 40.5998″[2] |
| Apparent magnitude (V) | +3.84[1] |
| Characteristics | |
| Spectral type | B8/9II[3] |
| B−V color index | −0.104±0.006[1] |
| Variable type | Constant[4] |
| Astrometry | |
| Radial velocity (Rv) | +25.0±4.1[1] km/s |
| Proper motion (μ) | RA: −28.18[2] mas/yr Dec.: +41.48[2] mas/yr |
| Parallax (π) | 10.20±0.10 mas[2] |
| Distance | 320 ± 3 ly (98.0 ± 1.0 pc) |
| Absolute magnitude (MV) | −1.12[1] |
| Details | |
| Radius | 4.057[5] R☉ |
| Luminosity | 446[5] L☉ |
| Temperature | 13,180[5] K |
| Other designations | |
| c Car, CPD−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]