· · · ·

The Horse and Rider

Mizar and Alcor

GenitiveUrsae Majoris
Right Ascension13h 23m 56s to 13h 25m 14s
Declination+54° 55' 31" to +54° 59' 17"
Separation11' 48.6"
Brightest StarMizar
Optimum VisibilityApril / May (Usually visible from northern latitudes)
Map of the Horse and Rider in Ursa Major
Map of the Horse and Rider in Ursa Major

The brighter of the two main stars shown here is second-magnitude Mizar or Zeta Ursae Majoris, the Horse of this asterism. Its Rider is fourth-magnitude Alcor or g Ursae Majoris. The two stars are separated by less than twelve arcminutes on the celestial sphere, and indeed are physically close to one another in space, probably lying less than a light year apart. Imagery provided by Aladin sky atlas


Related Entries