Crommelin's comet

Crommelin's comet

(kroh -mĕ-linz) An inconspicuous comet with a period of 27.7 years, first observed in 1818. Its apparition in March 1984 was observed internationally: the results were used to test techniques to be used in the observation of Halley's comet, perihelion Feb. 1986, the observing conditions for the two comets being very similar.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006