A Jupiter-type comet discovered in 1948
at the Lick Observatory by Carl A. Wirtanen.
Its orbit takes almost to as close to the Sun as Earth, and almost as far
away as Jupiter. Comet Wirtanen was to have
been the target for the Rosetta probe; however,
the target comet was changed following a delay in the spacecraft's launch.
|Photo: Max-Planck-Institut fur Aeronomie, courtesy
T. Credner, J. Jockers, T. Bonev