  Delta Scorpii is a double giant Be star in the forefront of the Scorpio, well
visible to the naked eye, being normally of magnitude 2.3. In the year 2000 its
luminosity rose up suddenly to the magnitude 1.6, changing the usual aspect of
the constellation of Scorpio. This phenomenon has been associated to the close
periastron of the companion, orbiting on a elongate ellipse with a period of
about 11 years. The periastron, on basis of high precision astrometry, is
expected to occur in the first decade of July 2011, and the second star of the
system is approaching the atmosphere of the primary, whose circumstellar disk
has a H-alpha diameter of 5 milliarcsec, comparable with the periastron
distance. The preliminary results of a photometric campaign, here presented in
the very days of the periastron, show an irregular behavior of the star's
luminosity, which can reflect some shocks between material around the two
stars. The small luminosity increasement detected in the observation of 5 of
July 2011 at 20 UT may suggest that the periastron phenomena are now going to
start.
