79-Zeta Uma 'Mizar' & 80 Uma 'Alkor'
| WDS | 13239+5456 |
| RA | 13 23 55 |
| Dec | +54 55 31 |
| Sternbild/Constellation | Uma, Ursa Major / Gr. Bär / Great bear Foto/Photo  |
| Bmkg./Note | - |
| Komponenten Components |
Abstand " Separation " |
Mag 1 | Mag 2 | Positionswinkel Position angle |
| Aa AB AC |
0 14,3 708,5 |
2,23 2,23 2,23 |
? 3,88 4,01 |
136 153 71 |
WDS notes: Zeta UMa or Mizar. According to R.G. Aitken (A__1935f), this was the first double discovered (Jean Baptiste Riccioli) in 1650, the first observed photographically (G.P. Bond at Harvard College Observatory in 1857 using an 8 second exposure on a collodion plate), and the first spectroscopic binary discovered (E.C. Pickering in 1889). A is a spectroscopic binary, P = 20.54d. B is also a spectroscopic binary, P = 175.6d, spectrum A1m or A1/A2/A7. Also, common proper motion with 80 UMa (Alcor) and other members of the Ursa Major stream.
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