  Calar Alto Images of Fragment A Impact    Short Description of
the A Sequence  This sequence of six images shows the A impact
of 16 July 1994. These images were taken at the German-Spanish
3.5 meter telescope on Calar Alto in southern Spain, using
MAGIC, the near infrared camera of the Max-Planck-Institut fuer
Astronomie in Heidelberg, Germany.  The bright object to the
right of Jupiter is the innermost Galilean moon, Io, and the
fainter oval structure in the southern hemisphere is the Great
Red Spot. The polar caps appear bright at the wavelength of the
observations, 2.3 um, which was selected to maximize contrast
between the impact region and the jovian cloud deck. All six
frames have a logarithmic relation between intrinsic brightness
and colour, which mimics the behaviour of the human eye.  The
following paragraphs give further information on each image.
Pre-Impact 19:49:04 UT (upper left)  Jupiter and Io twenty
minutes prior to the first impact. The spikes emerging from Io
are due to diffraction from