Mizar

(mÿ -zar) (ζ UMa) A white main-sequence dwarf that is one of the brighter stars of the Plough. It forms an optical double with the 4th-magnitude Alcor with a separation of 12′. But Mizar itself is also a double, a fact discovered by Riccioli in 1650. The two components of Mizar, A (the brighter) and B, are currently 14″ apart. It is thought that they complete one orbit about each other in 5000 years. Both components are spectroscopic binaries (see spectroscopic binary). Mizar A was the first spectroscopic binary to be identified (E.C. Pickering, 1889) and has a period of 20.5 days; Mizar B has a period of 361 days. All the stars in the Mizar system are main-sequence dwarfs. The brighter components are of spectral type A2, while the fainter ones are of A5 or A7. m_v : 2.27; M_v : 0.07; spectral type: A2 V; distance: 23 pc.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Mizar

also ζ Ursae Majoris, a star located at a distance of 27 parsecs from the sun and having a visual magnitude of 2.0 and a luminosity 74 times the solar luminosity. Mizar is actually a system of three stars. Displacement of the spectral lines of the components of Mizar was first discovered in 1889; these lines arise as a consequence of the orbital motion of the separate components about a common center of gravity.

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BRIGHTON: 2.20 Little, 2.50 Royal Mizar, 3.20 Sweeping Rock, 3.50 Chanceuse, 4.20 Hawk Sweeping Rock, 3.50 Chanceuse, 4.20 Hawk Moth, 4.50 Top Offer, 5.20 Captain Ryan.

TODAY'S TIPS

BATH 2.20 Methaaly 2.50 Little 3.20 Sleep Walk 3.50 Miss Crystal 4.25 Sweeping Rock 4.55 Royal Mizar 5.25 Meebo 5.55 See Vermont KEMPTON 5.40 Lady Percy 6.10 Poyle Jessica 6.40 Emirates Joy 7.10 Marengo 7.40 Anton Chigurh 8.10 Sleeper 8.40 King Calypso LINGFIELD 2.00 Aussie Ruler 2.30 Qatar Road 3.00 Piping Dream 3.30 Taqweem 4.05 Bond Empire 4.35 Sparkling Ice 5.05 Wrood 5.35 Shuriken SOUTHWELL 2.10 Ever So Much 2.40 Heronry 3.10 To The Sky 3.40 Admiral Hawke 4.15 Man Of Steel 4.45 Silent Knight 5.15 Mogestic

THE MAIL'S TOP TIPS

Tomorrow's tips BATH: 2.20 Methaaly, 2.50 Little, 3.20 Sleep Walk, 3.50 Miss Crystal, 4.25 Sweeping Rock, 4.55 Royal Mizar, 5.25 Meebo, 5.55 See Vermont.

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TOMORROW'S TIPS BATH: 2.20 Methaaly, 2.50 Little, 3.20 Sleep Walk, 3.50 Miss Crystal, 4.25 Sleep Walk, 3.50 Miss Crystal, 4.25 SW eeping Rock, 4.55 Royal Mizar, 5.25 SW eeping Rock, 4.55 Royal Mizar, 5.25 Meebo, 5.55 See Vermont.

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