Mizar (star)

Mizar Aa (79 Ursae Majoris Aa)
Spectral	A2 Vp
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	~ 25 LSol
Absolute magnitude	0.33
Mag Terra	2.27
Temperature	~ 8500° K
Mass	~ 2.5 MSol
Companion	Mizar Ab / Mizar B / Alcor AB

Mizar Ab (79 Ursae Majoris Ab)
Spectral	A2 Vp
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	~ 25 LSol
Absolute magnitude	0.33
Mag Terra	2.27
Temperature	~ 8500° K
Mass	~ 2.5 MSol
Companion	Mizar Aa / Mizar B / Alcor AB

Mizar Ba (79 Ursae Majoris Ba)
Spectral	A1 Vm
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	~ 30 LSol
Absolute magnitude	0.33
Mag Terra	3.95
Temperature	~ 9000° K
Mass	~ 1.5 MSol
Companion	Mizar Bb / Mizar A / Alcor AB

Mizar Bb (79 Ursae Majoris Bb)
Spectral	A5-7 V
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	~ 10 LSol
Absolute magnitude	0.33
Mag Terra	3.95
Temperature	~ 7500° K
Mass	~ 1.5 MSol
Companion	Mizar Ba / Mizar A / Alcor AB

Alcor A (80 Ursae Majoris A)
Spectral	A5 V
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	12 LSol
Absolute magnitude
Mag Terra	3.99
Temperature	8000° K
Mass	1.8 MSol
Companion	Alcor B / Mizar AB

Alcor B (80 Ursae Majoris B)
Spectral	M3.5 V
Type	Main Sequence
Multiple	Sextenary (See Text)
Luminosity	LSol
Absolute magnitude
Mag Terra	3.99
Temperature	° K
Companion	Alcor A / Mizar AB

The quadruple star system Mizar (or 79 Ursae Majoris) and the double star Alcor (or 80 Ursae Majoris or g Ursae Majoris) together form the sextenary star system known as Zeta Ursae Majoris.

Description (Specifications)

The Mizar and Alcor star systems together form a sextenary star system. The Mizar quaternary subsystem and the Alcor binary subsystem are separated by approximately 75,000AU (or ~ 1.0 light year), and have an orbital period of ~750,000 years about one another.

Mizar is itself a quadruple star system composed of two binary pairs (Mizar A and Mizar B) in orbit about one another. The Mizar A and Mizar B binary subsystems are separated by at least 500AU, taking at least 5000 years to make their orbit about one another.

• Mizar A is composed of the elements Mizar Aa and Mizar Ab, both of which are nearly identical blue-white main sequence stars of spectral type A1-2. The Mizar A pair have a mutual orbital period of 20.5 days.
• Mizar B is composed of the elements Mizar Ba (a blue-white main sequence star of spectral type A1) and Mizar Bb (a blue-white main sequence or early subgiant star of spectral type A5-7). The Mizar B pair have a mutual orbital period of about half a year.

Alcor is a binary star system composed of the two stars Alcor A and Alcor B. The two stars are separated by ~25AU, orbiting one another with a 90 year orbital period.

The Zeta Ursae Majoris star system is approximately 26.3pc from Terra, and is located in a Spinward direction from Terra at bearing 113.1^o Galactic Longitude and +61.6^o North] Galactic Latitude.

• The Phecda star system is located close to the Mizar-Alcor star system, and is separated from it by a distance of ~2.62 pc.

History & Background (Dossier)

• Despite the similarity in name, Mizar is NOT the primary star of the world Mizar-5/Quinoid (Old Expanses 1101), which lies to Coretrailing of Terra and is of stellar type K0 V.
• Despite the similarity in name, Mizar is NOT located in the Mizar Subsector of Zarushagar Sector.

References & Contributors (Sources)

This article has metadata.

This page uses content from Wikipedia. The original article was at Zeta_Ursae_Majoris. The list of authors can be seen in the page history. The text of Wikipedia is available under the Commons Attribution-ShareAlike 3.0 Unported License.

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• EXTERNAL LINK: SIMBAD @ University of Strasbourg: [1]
• EXTERNAL LINK: STARS (University of Illinois - Prof. Jim Kaler): [2]
• Traveller Wiki Editorial Team
• Author & Contributor: WHULorigan
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science