Mizar

Mi·zar

M0354700 (mī′zär′)n. The binary star in the middle of the handle of the Big Dipper, in the constellation Ursa Major, approximately 78 light years from Earth.

[New Latin, from Arabic mi'zar, covering, apron (used as the name of the star Beta Andromeda, representing part of Andromeda's apron or girdle, but later applied to the star Mizar by Joseph Justus Scaliger, by confusion with an earlier name of Mizar, Mirak), from 'azara, to surround; see ʔzr in Semitic roots.]

Mizar

(ˈmaɪzɑː) n (Celestial Objects) a multiple star having four components that lies in the Plough in the constellation Ursa Major and forms a visible binary with the star Alcor. Visual magnitude: 2.1; spectral type: A2V[from Arabic mi'zar cloak]

Mizar

enUK

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.

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.

单词	mizar
释义	Mizar enUK Mi·zar M0354700 (mī′zär′)n. The binary star in the middle of the handle of the Big Dipper, in the constellation Ursa Major, approximately 78 light years from Earth. [New Latin, from Arabic mi'zar, covering, apron (used as the name of the star Beta Andromeda, representing part of Andromeda's apron or girdle, but later applied to the star Mizar by Joseph Justus Scaliger, by confusion with an earlier name of Mizar, Mirak), from 'azara, to surround; see ʔzr in Semitic roots.] Mizar (ˈmaɪzɑː) n (Celestial Objects) a multiple star having four components that lies in the Plough in the constellation Ursa Major and forms a visible binary with the star Alcor. Visual magnitude: 2.1; spectral type: A2V[from Arabic mi'zar cloak] Mizar enUK 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. 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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