| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 09h16m 12.07286s[1] |
| Declination | −57° 32′ 29.3007″[1] |
| Apparent magnitude (V) | 4.34[2] |
| Characteristics | |
| Spectral type | M0.5IIIa[3] |
| B−V color index | +1.602±0.079[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −5.2±0.7[2] km/s |
| Proper motion (μ) | RA: −27.15[1] mas/yr Dec.: −14.18[1] mas/yr |
| Parallax (π) | 6.68 ± 0.15 mas[1] |
| Distance | 490 ± 10 ly (150 ± 3 pc) |
| Absolute magnitude (MV) | −1.53[2] |
| Details | |
| Mass | 2.2±0.3[5] M☉ |
| Radius | 74.86+3.84 −5.71[6] R☉ |
| Luminosity | 1,172±60[6] L☉ |
| Surface gravity (log g) | 0.95±0.12[5] cgs |
| Temperature | 3,904+158 −96[6] K |
| Other designations | |
g Car, NSV 4440, CPD−57°1961, GC 12813, HD 80230, HIP 45496, HR 3696, SAO 236787[7] | |
| Database references | |
| SIMBAD | data |
HD 80230 is a single[8] star in the southern constellationofCarina, near the northern constellation border with Vela. It has the Bayer designation g Carinae, while HD 80230 is the star's identifier in the Henry Draper catalogue. This is a suspected variable star with a brightness that has been measured varying from magnitude 4.31 down to 4.35,[4] both of which is bright enough for the star to be visible to the naked eye. The distance to this object is approximately 490 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −5 km/s.[2]
This object is an aging red giant, currently on the asymptotic giant branch,[9] with a stellar classification of M0.5IIIa.[3] It is a mild barium star, showing trace enhancement of s-process elements in its spectrum.[10] The star has 2.2[5] times the mass of the Sun and has expanded to 75[6] times the Sun's radius. It is radiating 1,172 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,904 K.[6]
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