Mizar, Zeta Ursa Major (ζ UMa) is the middle star of the arm of Ursa Major. It has an apparent magnitude of 2.23 and is 82.9 light years away from us. This is the first double star that was photographed in 1857.

Mizar is the fourth brightest star in the Big Dipper and the 69th brightest star in the sky. It is the main component of the multiple star system, which consists of two spectroscopic binary stars. She forms a visual twin with the weaker Alcor, to which she can be physically linked. These two stars are sometimes called the Horse and the Rider.

Alcor itself has a fainter companion, so if it is indeed gravitationally bound to Mizar, that would make Zeta Ursa Major a six-star system. Both Mizar and Alcor are members of the moving group of the Ursa Major.

Mizar, the primary component of the Zeta UMa system, is a main-sequence white star of spectral type A2Vp. Its mass is 2.2224 times that of the Sun, and its radius is 2.4 times that of the Sun. With a surface temperature of about 9,000 K, it shines at 33.3 solar luminosities. It is believed that the age of the star is about 370 million years.

Aliot Aliot, Epsilon Ursa Major (ε UMa) is a star in the tail of Ursa Major, closest to the body of Ursa Major. It has a visual magnitude of 1.77 and is about 82.6 light years away. It has a stellar classification of A1III-IVp kB9, meaning a white star nearing the end of its main sequence.

Aliot has a mass of 2.91 solar masses and is 4.14 times larger than the Sun. It shines with a luminosity of 102 solar magnitudes with an effective temperature of about 9,020 K. The age of the star is estimated at 300 million years.

Aliot is a special star that shows variations in its spectral lines during 5.1 days. It is classified as a variable Alpha2 Canum Venaticorum. It is the brightest of the seven stars that make up the Ursa Major asterism.

Magrez Meghrez, Delta Ursa Major (δ UMa), is the dimmest of the seven stars in Ursa Major. This is the inner star of the bowl of the Big Dipper, closest to its tail. It has an apparent magnitude of 3.312 and is 80.5 light years away.

Magrez is only the 11th brightest star in the Big Dipper. It is eclipsed by the other stars of Ursa Major, as well as Psi Ursa Major, Tania Australis (Mu UMa), Theta Ursa Major, and Talitha (Iota UMa) in the legs and paws of Ursa Major.

Meghrez is a white star of the main sequence of spectral type A3 V. It has a mass of 1.63 solar masses and a radius of 1.4 solar radii. With a surface temperature of about 9480 K, it is 14 times brighter than the Sun. The star is a fast rotator, with a predicted rotation speed of 233 km