(television) A display artifact consisting of a smear of color that appears to follow a moving object in the picture. / Used other than figuratively or idiomatically: see comet, tail.

Alternative form of Halley's Comet

(astronomy) A comet that has shed its volatiles after numerous passes around the sun.

Alternative spelling of nonperiodic comet

(astronomy) a comet having a period of revolution shorter than 200 years and a perihelion distance smaller than 1.3 au

(astronomy) Any periodic comet with an orbital period of less than 200 years.

Alternative form of short-period comet