Cor Caroli: A Binary Star with a Heart of a King

Cor Caroli is a double star in the constellation Canes Venatici. It’s best viewed in spring. The primary star, at a magnitude of 2.9, shines a white blue, while the dimmer companion, at a magnitude of 5.5, shines a warm yellow. This contrast of color makes for an attractive pair in the warming spring sky.

Zeta Cancri: A Multiple Star System in Cancer

Zeta Cancri is a multiple star system in the constellation Cancer. It’s best viewed in the spring. For many years, astronomers believed Zeta Cancri to be a triple star system, though now it has been found to be a quadruple system. According to Jim Kaller, the close binary pair (known as Zeta Cancri A andContinueContinue reading “Zeta Cancri: A Multiple Star System in Cancer”

Messier 81 (NGC 3031): Bode’s Galaxy

Messier 81 is a spiral galaxy in Ursa Major. It’s best viewed in the spring. Galaxies are often faint and tough to see from suburban skies. However, Bode’s Galaxy is bright enough to see using smaller scopes and is a great object for amateur astronomers starting out in the hobby. Its spiral arms, the brightContinueContinue reading “Messier 81 (NGC 3031): Bode’s Galaxy”