HD 221170
variable star
HD 221170 is a very metal-poor red giant star in the constellation Pegasus, the star is 1,814 light years away from earth
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 29m 28.8087s |
| Declination | +30° 25′ 57.849″ |
| Apparent magnitude (V) | +7.66 |
| Characteristics | |
| Spectral type | CEMP-r or K3IIIe |
| Astrometry | |
| Distance | 1,814 ly |
| Details | |
| Mass | 0.822 M☉ |
| Radius | 24.91 R☉ |
| Luminosity | 289 L☉ |
| Temperature | 4,766 K |
| Metallicity [Fe/H] | -2.69 dex |
| Age | 13.2 Gyr |
| Other designations | |
HD 221170, HIP 115949, SAO 73293, BD +29° 4940, IRAS 23270+3009, TYC 2765-415-1, 2MASS J23292881+3025578 | |
The name HD 221170 is because it is the 221,170th stars in the Henry Draper catalogue, however, the star does not have HR numbers, because the star is too faint to visible by naked eye
The name HIP 115949 is because it is the 115,949th stars in the Hipparcos catalogue, and The name SAO 73293 is because it is the 73,293rd stars in the Smithsonian Astrophysical Star catalogue