SSSPM J1549-3544
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 48m 40.172s |
| Declination | −35° 44′ 26.17″ |
| Apparent magnitude (V) | 14.78 |
| Characteristics | |
| Spectral type | sdK5 |
| Astrometry | |
| Proper motion (μ) | RA: −597.714 mas/yr Dec.: −535.841 mas/yr |
| Parallax (π) | 10.4127±0.0214 mas |
| Distance | 313.2 ± 0.6 ly (96.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 9.5 |
| Details | |
| Radius | 0.30 R☉ |
| Luminosity | 0.02 L☉ |
| Surface gravity (log g) | 5.0 cgs |
| Temperature | 3,956 K |
| Metallicity [Fe/H] | −1.28 dex |
| Other designations | |
| SSSPM J1549-3544, 2MASS J15484023-3544254 | |
| Database references | |
| SIMBAD | data |
SSSPM J1549-3544 is a star in the constellation Lupus with high proper motion. It was initially found to have high proper motion in a 2003 survey of images taken by the optical SuperCOSMOS Sky Surveys and by the near-infrared sky surveys 2MASS and DENIS. It was then thought to be a cool white dwarf close to the Sun. However, more detailed spectroscopic observations in 2005 appear to show that it is not a white dwarf, but a high-velocity halo metal-poor subdwarf.