An antitail is, when viewed from Earth,[why?] a spike projecting from a comet's coma towards the Sun, and thus geometrically opposite to the other tails: the ion tail and the dust tail. The antitail is formed of larger dust particles, which are less affected by the Sun's radiation pressure or solar wind, and tend to remain in the comet's orbital plane and eventually form a disc. As Earth passes through the comet's orbital plane, this disc is seen side on, and appears as the characteristic spike. The other side of the disc can sometimes be seen, though it tends to be lost in the dust tail. The antitail is therefore normally visible for a brief interval only when Earth passes through the comet's orbital plane.
Most comets do not develop sufficiently for an antitail to become visible, but notable comets that did display antitails include Comet Arend–Roland in 1957, Comet Hale–Bopp in 1997 and Comet PANSTARRS in 2013.
- "Encyclopedia of science:antitail".
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- Tosar, Borja; Paolo Candy. "What is an antitail". 3.bp.blogspot. Archived from the original on 25 February 2009. Retrieved 2009-02-25.
- Emily Lakdawalla - Got binoculars? Spot a comet near Saturn tonight (Feb. 23, 2009)[dead link]
- Online Encyclopedia of Science - Antitail
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