Lost comet | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Lost_comet


00:00:46 1 Overview
00:04:06 2 List
00:04:47 3 See also



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Voice name: en-AU-Wavenet-A


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SUMMARY
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A comet is "lost" when it has been missed at its most recent perihelion passage. This generally happens when data is insufficient to reliably calculate the comet's orbit and predict its location. The D/ designation is used for a periodic comet that no longer exists or is deemed to have disappeared.Lost comets can be compared to lost minor planets, although calculation of comet orbits differs because of nongravitational forces, such as emission of jets of gas from the nucleus. Some astronomers have specialized in this area, such as Brian G. Marsden, who successfully predicted the 1992 return of the once-lost periodic comet Swift–Tuttle.