Astronomy:SSSPM J1549-3544
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Short description: Star
| Observation data Equinox J2000.0]] (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[1] mas |
| 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 |
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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Farihi, J.; Wood, P. R.; Stalder, B. (2005). "SSSPM J1549-3544 is Not a White Dwarf". The Astrophysical Journal 627 (1): L41–L43. doi:10.1086/432158. Bibcode: 2005ApJ...627L..41F.
- ↑ Scholz, R. -D; Lehmann, I.; Matute, I.; Zinnecker, H. (2004). "The nearest cool white dwarf (D ∼4 pc), the coolest M-type subdwarf (SdM9.5), and other high proper motion discoveries". Astronomy and Astrophysics 425: 519–527. doi:10.1051/0004-6361:20041059. Bibcode: 2004A&A...425..519S.
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