SSSPM J1549−3544
Star
From Wikipedia, the free encyclopedia
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.[3] 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.[2]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 48m 40.172s[1] |
| Declination | −35° 44′ 26.17″[1] |
| Apparent magnitude (V) | 14.78[2] |
| Characteristics | |
| Spectral type | sdK5[2] |
| Astrometry | |
| Proper motion (μ) | RA: −597.714[1] mas/yr Dec.: −535.841[1] mas/yr |
| Parallax (π) | 10.4127±0.0214 mas[1] |
| Distance | 313.2 ± 0.6 ly (96.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 9.5 |
| Details | |
| Radius | 0.30[1] R☉ |
| Luminosity | 0.02[1] L☉ |
| Surface gravity (log g) | 5.0[1] cgs |
| Temperature | 3,956[1] K |
| Metallicity [Fe/H] | −1.28[1] dex |
| Other designations | |
| SSSPM J1549−3544, 2MASS J15484023−3544254 | |
| Database references | |
| SIMBAD | data |
