Pi Ursae Minoris
The Bayer designation Pi Ursae Minoris (π UMi, π Ursae Minoris) is shared by two star systems, π¹ Ursae Minoris and π² Ursae Minoris, in the constellation Ursa Minor. They are separated by 0.64° on the sky.
π¹ Ursae Minoris
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 29m 23.77s |
| Declination | +80° 27' 00.3" |
| Apparent magnitude (V) | +6.58 |
| Distance | 70.8 ± 1.1 ly (21.7 ± 0.3 pc) |
| Spectral type | G0IV-V+G8IV-V |
| Other designations | |
Pi-1 Ursae Minoris is a triple star system approximately 70.8 light years from Earth. The system is dominated by a binary pair of two yellow G-type subgiants which are 32 arcseconds apart and have apparent magnitudes of +6.9 and +7.8. They also have an 11th magnitude companion, Pi-1 Ursae Minoris C, which is 135 arcseconds away.
π² Ursae Minoris
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 39m 38.72s |
| Declination | +79° 58' 59.2" |
| Apparent magnitude (V) | +6.89 |
| Distance | 384 ± 42 ly (118 ± 13 pc) |
| Spectral type | F2V |
| Other designations | |
Pi-2 Ursae Minoris is a binary star approximately 384 light years from Earth. The primary component, Pi-2 Ursae Minoris A, is a yellow-white F-type star with an apparent magnitude of +6.89. The companion star, Pi-2 Ursae Minoris B, has an apparent magnitude of +8.3 and is 0.67 arcseconds from the primary. The binary star completes one orbit every 188 years.