S Ursae Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 29m 34.5775s |
| Declination | +78° 38′ 00.2742″ |
| Apparent magnitude (V) | 7.5-<13.2 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M6e-M9e |
| Variable type | Mira |
| Astrometry | |
| Proper motion (μ) | RA: −30.986±0.303 mas/yr Dec.: 7.006±0.309 mas/yr |
| Parallax (π) | 2.5455±0.1578 mas |
| Distance | 1,280 ± 80 ly (390 ± 20 pc) |
| Details | |
| Mass | 2.3 M☉ |
| Radius | 744 R☉ |
| Luminosity | 3,896 L☉ |
| Surface gravity (log g) | 1.63 cgs |
| Temperature | 3,457 K |
| Other designations | |
| S UMi, HD 139492, HIP 75847 | |
| Database references | |
| SIMBAD | data |
S Ursae Minoris (S UMi) is a Mira variable star in the constellation Ursa Minor, ranging from magnitude 7.5 to fainter than 13.2 over a period of 331 days.
Williamina Fleming discovered that the star's brightness varies, in 1895.