S Doradus
S Doradus (also known as S Dor) is one of the brightest stars in the Large Magellanic Cloud (LMC), a satellite galaxy of the Milky Way, located roughly 160,000 light-years away. The star is a luminous blue variable, and one of the most luminous stars known, having a luminosity varying widely above and below 1,000,000 times the luminosity of the Sun, although it is too far away to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 18m 14.3572s |
| Declination | −69° 15′ 01.148″ |
| Apparent magnitude (V) | 8.6 – 11.5 |
| Characteristics | |
| Spectral type | B8/9eq – F0/5:Iae |
| U−B color index | –0.98 |
| B−V color index | +0.11 |
| Variable type | S Doradus |
| Astrometry | |
| Radial velocity (Rv) | +228 km/s |
| Proper motion (μ) | RA: 1.735 mas/yr Dec.: 0.280 mas/yr |
| Parallax (π) | 0.0073 ± 0.0371 mas |
| Distance | 169,000 ly (51,800 pc) |
| Absolute magnitude (MV) | –7.6 (1965) –10.0 (1989) |
| Details | |
| Mass | 24+16 −2 M☉ |
| 1989 (maximum) | |
| Radius | 380 R☉ |
| Luminosity | 910,000 L☉ |
| Surface gravity (log g) | 0.6 cgs |
| Temperature | 8,500 K |
| 1985 (minimum) | |
| Radius | 100 R☉ |
| Luminosity | 1,400,000 L☉ |
| Surface gravity (log g) | 1.6 cgs |
| Temperature | 20,000 K |
| 1965 (deep minimum) | |
| Luminosity | 2,000,000 L☉ |
| Temperature | 35,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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