spacecraft on a comet. The word comet derives from the Old English cometa from the Latin comēta or comētēs. That, in turn, is a romanization of the Greek κομήτης...

comets "JPL Small-Body Database Browser: C/1680 V1" (1681-03-19 last obs (Encke: 125-day data arc)). Jet Propulsion Laboratory. Retrieved 26 July 2011....

orbital period of about 70 years with an error of about 5 years. Johann Franz Encke determined a definitive orbit with a period of 70.68 years. This orbit was...