Doubling the Hipparcos star count: the Tycho-2 Catalogue
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This starfield, 1 degree wide, includes a famous double star Alcor and
Mizar (double white circle) 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 squares. Stars that are in both the
Hipparcos Catalogue and Tycho-2 have white circles, while stars in both
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.
Last Update: 1 September 2019
