U Orionis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 55m 49.17076s |
| Declination | +20° 10′ 30.6779″ |
| Apparent magnitude (V) | 4.8 - 13.0 |
| Characteristics | |
| Spectral type | M6e-M9.5e |
| B−V color index | +2.07 |
| Variable type | Mira |
| Astrometry | |
| Parallax (π) | 3.4924±0.1820 mas |
| Distance | 930 ± 50 ly (290 ± 10 pc) |
| Details | |
| Mass | 0.88 M☉ |
| Radius | 370±96 R☉ |
| Luminosity | 7,000 L☉ |
| Surface gravity (log g) | −0.44 cgs |
| Temperature | 2,641 K |
| Metallicity [Fe/H] | 0.54 dex |
| Other designations | |
| U Ori, BD+20°1171a, HD 39816, HIP 28041, HR 2063, SAO 77730 | |
| Database references | |
| SIMBAD | data |
U Orionis (abbreviated U Ori) is a Mira-type variable star in the constellation Orion. It is a classical long period variable star that has been well observed for over 120 years.