HD 101584
HD 101584 seen by ALMA. The blue component moves towards the observer and the red component moves away from the observer. The green component has the same speed as the binary system, seen as a green point source in the middle. Credit: ALMA (ESO/NAOJ/NRAO), Olofsson et al. Acknowledgement: Robert Cumming | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 40m 58.80515s |
| Declination | −55° 34′ 25.8147″ |
| Apparent magnitude (V) | 7.01 |
| Characteristics | |
| Spectral type | A6Ia |
| Astrometry | |
| Proper motion (μ) | RA: −7.935 mas/yr Dec.: −0.243 mas/yr |
| Parallax (π) | 0.5452±0.0199 mas |
| Distance | 6,000 ± 200 ly (1,830 ± 70 pc) |
| Details | |
| supergiant | |
| Mass | 0.5 - 1 M☉ |
| Radius | 18.6 R☉ |
| Luminosity | 1,600 L☉ (@1kpc) (400 - 5,000) L☉ |
| Temperature | 8,500 K |
| companion | |
| Mass | 0.27 - 0.41 M☉ |
| Other designations | |
| IRAS 11385-5517, V885 Centauri, HIP 56992, 2MASS J11405880-5534258 | |
| Database references | |
| SIMBAD | data |
HD 101584 is a suspected post-common envelope binary about 1,800 to 5,900 light-years distant in the constellation of Centaurus. The system is bright at optical wavelengths with an apparent visual magnitude of about 7. The primary is either a post-AGB star, but more likely a post-RGB star. The secondary is a red dwarf or possibly a low-luminosity white dwarf, which orbits the primary every 150-200 days. The system is surrounded by a slowly rotating circumbinary disk, probably with a face-on orientation towards the Solar System and a size of about 150 astronomical units.