Mizar, Zeta Ursae Majoris (ζ UMa), is a quadruple star system in Ursa Major. It lies at a distance of 82.9 ly. It is one of the stars that form the Big Dipper.| Star Facts
Alcor (80 Ursae Majoris, g Ursae Majoris) is a double star in the constellation Ursa Major. It is the fainter companion to the Big Dipper star Mizar.| Star Facts
Messier 105 (M105) is an elliptical galaxy located in the northern constellation Leo. The galaxy lies at a distance of 32 million light years from Earth and has an apparent magnitude of 10.2. Its designation in the New General Catalogue is NGC 3379. M105 occupies an area of 5.4 by 4.8 arc minutes of apparent… Read More »Messier 105| Messier Objects
Messier 103 (M103) is an open star cluster located in the northern constellation Cassiopeia. The cluster lies at a distance of 10,000 light years from Earth and has an apparent magnitude of 7.4. Its designation in the New General Catalogue is NGC 581. M103 occupies an area 6 arc minutes in apparent size, corresponding to… Read More »Messier 103| Messier Objects
Charles Messier’s Catalogue of Nebulae and Star Clusters (Catalogue des Nébuleuses et des Amas d’Étoiles) is an astronomical catalogue of 110 bright deep sky objects that may be mistaken for comets. Even though it was compiled for the purpose of helping observers distinguish between permanent and transient objects in the night sky, the Messier catalogue… Read More »Messier Catalogue| Messier Objects