HR Carinae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 22m 53.84074s |
| Declination | −59° 37′ 28.3774″ |
| Apparent magnitude (V) | 8.42 (6.95–8.80) |
| Characteristics | |
| Spectral type | LBV + RSG |
| U−B color index | −0.22 |
| B−V color index | +0.92 |
| Variable type | LBV |
| Astrometry | |
| Proper motion (μ) | RA: –6.161 mas/yr Dec.: +2.163 mas/yr |
| Parallax (π) | 0.1708±0.0326 mas |
| Distance | 4,370 pc |
| Absolute magnitude (MV) | −9.4 |
| Orbit | |
| Period (P) | 4557.5 ± 21.0 days |
| Semi-major axis (a) | 3.324 ± 0.026" (18 AU) |
| Eccentricity (e) | 0.4 ± 0.2 |
| Inclination (i) | 119.2 ± 0.7° |
| Details | |
| HR CarLBV | |
| Mass | 25–40 M☉ |
| Radius | 220±60 (100–350) R☉ |
| Luminosity | 416,000–790,000 L☉ |
| Temperature | 7,900–21,900 K |
| Rotational velocity (v sin i) | 150 km/s |
| HR CarRSG | |
| Mass | 9–20 M☉ |
| Radius | 500±150 R☉ |
| Temperature | 3,600–4,000 K |
| Other designations | |
| HR Car, HD 90177, HIP 50843, SAO 238005, CD-59 3044, GC 14276, MWC 202, AAVSO 1019-59 | |
| Database references | |
| SIMBAD | data |
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HR Carinae is a luminous blue variable star located in the constellation Carina. It is surrounded by a vast nebula of ejected nuclear-processed material because this star has a multiple shell expanding atmosphere. This star is among the most luminous stars in the Milky Way. It has very broad emission wings on the Balmer lines, reminiscent from the broad lines observed in the spectra of O and Wolf–Rayet stars. A distance of 5 kpc and a bolometric magnitude of −9.4 put HR Car among the most luminous stars of the galaxy.