  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 35m 35.29721s [1] |
| Declination | −57° 33′ 27.4835″ [1] |
| Apparent magnitude (V) | 4.45 [2] |
| Characteristics | |
| Evolutionary stage | Bright giant [3] |
| Spectral type | K3II-IIb [4] |
| B−V color index | 1.604±0.004 [2] |
| Variable type | Suspected [5] |
| Astrometry | |
| Radial velocity (Rv) | +9.9±0.7 [2] km/s |
| Proper motion (μ) | RA: −15.93 [1] mas/yr Dec.: +0.49 [1] mas/yr |
| Parallax (π) | 2.77±0.17 mas [1] |
| Distance | 1,180 ± 70 ly (360 ± 20 pc) |
| Absolute magnitude (MV) | −3.77 [2] |
| Details | |
| Mass | 8.1±0.7 [6] M☉ |
| Radius | 155.5+5.6 −11.3 [7] R☉ |
| Luminosity | 5,485±693 [7] L☉ |
| Surface gravity (log g) | 2.0 [3] cgs |
| Temperature | 3,983+152 −69 [7] K |
| Metallicity [Fe/H] | 0.0 [3] dex |
| Rotational velocity (v sin i) | 5.8 [3] km/s |
| Age | 35.7±8.3 [6] Myr |
| Other designations | |
| r Car, NSV 4904, CPD−56°3544, FK5 393, GC 14570, HD 91942, HIP 51849, HR 4159, SAO 238222 [8] | |
| Database references | |
| SIMBAD | data |
HD 91942 is a single [9] variable star in the constellation Carina. It has the Bayer designation r Carinae, while HD 91942 is the identifier from the Henry Draper catalogue . This orange-hued object is visible to the naked eye with an apparent visual magnitude of 4.45. [2] Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun. [1] The star has an absolute magnitude of −3.77, [2] and is drifting further away with a radial velocity of +9.9 km/s. [2]
This object is a massive, aging bright giant with a stellar classification of K3II-IIb. [4] It is a suspected variable star that fluctuates in magnitude by an amplitude of 0.05 in the B-band of the UBV photometric system. [5] With the supply of hydrogen exhausted at its core, it has evolved of the main sequence and cooled and expanded to 156 [7] times the Sun's radius. It is an estimated 36 [6] million years old with eight [6] times the mass of the Sun. It is radiating around 5,500 [7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,983 K. [7]
