Tycho-2 : Alcor-Mizar
A one by one degree field with the well-known double star, Alcor and Mizar, in the tail of the Great Bear. The image is from the Digitized Sky Survey based on a red Palomar Schmidt plate. New Tycho-2 stars are marked with blue diamonds. Stars which are both in the Hipparcos Catalogue and in Tycho-2 are marked with white circles, while stars both in the first and the second Tycho catalogues are flagged with black circles. The faintest Tycho-2 stars in this field are of magnitude 12.4 in V_T. The star density is modest because the field is high above the galactic plane (+62 degrees).