HE 1523-0901
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 26m 01.070s |
| Declination | −09° 11′ 38.89″ |
| Apparent magnitude (V) | 11.129 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | CEMP |
| B−V color index | +1.057 |
| Astrometry | |
| Radial velocity (Rv) | −162.48±0.34 km/s |
| Proper motion (μ) | RA: −22.685 mas/yr Dec.: −28.204 mas/yr |
| Parallax (π) | 0.3278±0.0197 mas |
| Distance | 9,900 ± 600 ly (3,100 ± 200 pc) |
| Details | |
| Mass | 0.80±0.01 M☉ |
| Radius | 27 R☉ |
| Luminosity | 730 L☉ |
| Surface gravity (log g) | 1.29±0.15 cgs |
| Temperature | 4,742±100 K |
| Metallicity [Fe/H] | −2.65±0.22 dex |
| Age | 13.2 Gyr |
| Other designations | |
| HE 1523-0901, TYC 5594-576-1, 2MASS J15260106-0911388 | |
| Database references | |
| SIMBAD | data |
HE 1523-0901 is the designation given to a red giant star in the Milky Way galaxy approximately 9,900 light-years from Earth. It is thought to be a second generation, Population II, or metal-poor, star ([Fe/H] = −2.95). The star was found in the sample of bright metal-poor halo stars from the Hamburg/ESO Survey by Anna Frebel and collaborators. The group's research was published in the May 10, 2007 issue of The Astrophysical Journal.