Lambda Ursae Majoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 17m 05.78287s |
| Declination | +42° 54′ 51.6808″ |
| Apparent magnitude (V) | +3.45 |
| Characteristics | |
| Spectral type | A2 IV |
| U−B color index | +0.06 |
| B−V color index | +0.03 |
| Astrometry | |
| Radial velocity (Rv) | +18.1 km/s |
| Proper motion (μ) | RA: –180.65 mas/yr Dec.: –46.07 mas/yr |
| Parallax (π) | 23.72±0.78 mas |
| Distance | 138 ± 5 ly (42 ± 1 pc) |
| Absolute magnitude (MV) | +0.10 |
| Details | |
| Mass | 2.11 M☉ |
| Radius | 2.3 R☉ |
| Luminosity | 37 L☉ |
| Surface gravity (log g) | 3.76±0.14 cgs |
| Temperature | 9,247±314 K |
| Metallicity [Fe/H] | +0.20 dex |
| Rotational velocity (v sin i) | 50 km/s |
| Age | 380 Myr |
| Other designations | |
| Tania Borealis, λ Ursae Majoris, λ UMa, Lambda UMa, 33 Ursae Majoris, BD+43 2005, FK5 383, GC 14113, HD 89021, HIP 50372, HR 4033, PPM 51795, SAO 43268. | |
| Database references | |
| SIMBAD | data |
Lambda Ursae Majoris (λ Ursae Majoris, abbreviated Lambda UMa, λ UMa), formally named Tania Borealis /ˈteɪniə ˌbɒriˈælɪs/, is a star in the northern circumpolar constellation of Ursa Major.