Voyager and Galileo will be the only two spacecraft actually
in view of the nightside impact points for the many comet
fragments.
Voyager 2, launched in August 1977 and now leaving the solar
system after flying by and observing Jupiter, Saturn, Uranus and
Neptune, will be some 6 billion kilometers (3.7 billion miles)
from Jupiter in mid-July when the events begin. It will use its
ultraviolet spectrometer and its planetary radio astronomy
instrument to detect and measure emissions stimulated by the
comet impacts.