Star lore

Mizar

Direct answer

Mizar is Zeta Ursae Majoris, a multiple-star system in the Big Dipper handle beside the naked-eye companion Alcor.

Mizar is the famous handle double paired visually with Alcor.

Constellations & Star LoreThe Great Almanac DictionaryUpdated 2026-09-26

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At a glance

Found in
Constellations & Star Lore
Related
Phecda, Alioth, Alkaid, Denebola

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The story behind Mizar

Mizar became the first telescopic double star to be discovered and later the first spectroscopic binary identified.

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Why Mizar matters

Mizar connects a traditional eyesight test with the modern discovery that apparently simple stars can contain multiple nested systems.

How to read Mizar

Find the middle of the Dipper handle and look for faint Alcor beside Mizar before applying telescope magnification.

Mizar in practice: an example

A telescope splits Mizar A and B, while spectroscopy reveals each as a closer pair.

Where readings of Mizar go wrong

Mizar and Alcor are more than an optical coincidence, but the full system architecture is more complex than one double.

Sources and editorial method

Research references used for this entry include:

Source
The Great Almanac Dictionary
Category
Constellations & Star Lore
Last updated
2026-09-26

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A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Seeker trial.

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PhecdaPhecda is the bowl star opposite Dubhe in the Big Dipper. AliothAlioth is the bright inner handle star of the Big Dipper. AlkaidAlkaid is the bright tip of the Dipper handle and the Great Bear's tail. DenebolaDenebola is Leo's tail star and a corner of the Spring Triangle. ConstellationA Constellation is an official bounded region of the sky, often associated with a traditional star figure. AsterismAn Asterism is a familiar star pattern rather than an official bounded constellation.

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Common questions

What is Mizar?

Mizar is Zeta Ursae Majoris, a multiple-star system in the Big Dipper handle beside the naked-eye companion Alcor.

What do people get wrong about Mizar?

Mizar and Alcor are more than an optical coincidence, but the full system architecture is more complex than one double.

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