| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 |
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
- ^ a b c d e f g h i j Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Farihi, J.; Wood, P. R.; Stalder, B. (2005). "SSSPM J1549-3544 is Not a White Dwarf". The Astrophysical Journal. 627 (1): L41–L43. arXiv: astro-ph/0505525. Bibcode: 2005ApJ...627L..41F. doi: 10.1086/432158. S2CID 10645235.
- ^ 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. arXiv: astro-ph/0406457. Bibcode: 2004A&A...425..519S. doi: 10.1051/0004-6361:20041059. S2CID 9352481.
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