  This paper explores the uniqueness of ESA Rosetta mission operations from the
Alice instrument point of view, documents lessons learned, and suggests
operations ideas for future missions. The Alice instrument mounted on the
Rosetta orbiter is an imaging spectrograph optimized for cometary
far-ultraviolet (FUV) spectroscopy with the scientific objectives of measuring
properties of the escaping gas and dust, and studying the surface properties,
including searching for exposed ices. We describe the operations processes
during the comet encounter period, the many interfaces to contend with, the
constraints that impacted Alice, and how the Alice science goals of measuring
the cometary gas characteristics and their evolution were achieved. We provide
details that are relevant to the use and interpretation of Alice data and
published results. All these flight experiences and lessons learned will be
useful for future cometary missions that include ultraviolet spectrographs in
particular, and multi-instrument international payloads in general.
