V528 Carinae
Star in the constellation Carina
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V528 Carinae (V528 Car, HD 95950, HIP 54021) is a variable star in the constellation Carina.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Carina |
| Right ascension | 11h 03m 06.15s[1] |
| Declination | −60° 54′ 38.6″[1] |
| Apparent magnitude (V) | 6.27 - 6.78[2] |
| Characteristics | |
| Spectral type | M2 Ib:[3][4] |
| B−V color index | +2.04[5] |
| Variable type | Lc[6] |
| Astrometry | |
| Radial velocity (Rv) | −27.80[7] km/s |
| Proper motion (μ) | RA: −7.639[1] mas/yr Dec.: +2.109[1] mas/yr |
| Parallax (π) | 0.4504±0.0293 mas[1] |
| Distance | 7,200 ± 500 ly (2,200 ± 100 pc) |
| Absolute magnitude (MV) | −6.09[5] |
| Details | |
| Radius | 700[5] R☉ |
| Luminosity | 81,000[5] L☉ |
| Surface gravity (log g) | 0.0[5] cgs |
| Temperature | 3,700[5] K |
| Other designations | |
| V528 Car, CD−60°3327, HD 95950, HIP 54021, 2MASS J11030616−6054387, IRAS 11010−6038, WISE J110305.99−605438.7, SAO 251235 | |
| Database references | |
| SIMBAD | data |
V528 Carinae has an apparent visual magnitude that varies between about 6.3 and 6.8. When it is near its maximum brightness, it is very faintly visible to the naked eye under ideal observing conditions. It is a distant star but the exact distance is uncertain. The Hipparcos satellite gives a negative annual parallax and is not helpful,[8] while the Gaia Data Release 3 parallax of 0.45 mas implies a distance of around 7,200 light years (2,200 parsecs).[1] Assuming membership of the Carina OB2 membership would give a distance of about 1,830 parsecs.[9]
V528 Carinae is a red supergiant of spectral type M2 Ib with an effective temperature of 3,700 K. It has a radius of 700 solar radii.[5] In the visible spectrum, its luminosity is 11,900 times higher than the Sun,[11] but the bolometric luminosity considering all wavelengths reaches around 81,000 L☉.[5] It loses mass at 0.5×10−9 M☉ per year.[12]
It was found to be a variable star when the Hipparcos data was analyzed, and for that reason it was given its variable star designation in 1999.[13] It is classified as a slow irregular variable whose prototype is TZ Cassiopeiae.[6]