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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).
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