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 113.1o Galactic Longitude and +61.6o 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.
- The Phecda system is located close to the Mizar-Alcor star system, separated by a distance of ~2.62 pc.
Image Repository
TravellerMap (T5SS):
[1]
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. |
- EXTERNAL LINK: SIMBAD @ University of Strasbourg: [2]
- EXTERNAL LINK: STARS (University of Illinois - Prof. Jim Kaler): [3]
- Traveller Wiki Editorial Team
- Author & Contributor: WHULorigan
- Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science