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able amateur astronomers appeared April asteroid background stars binoculars Brian Marsden bright comet brighter brightest calculations Century closest approach Cloudcroft coma Comet Hale Comet Hale-Bopp Comet Hale-Bopp Days Comet Hyakutake Comet Kohoutek Comet Shoemaker-Levy Comet Shoemaker-Levy 9 Comet West comet's nucleus comet's orbit comet's tail cometary conjunction with sun constellation courtesy dark discovered discovery dramatic early earth earth's orbit eclipse February Fred Whipple full moon Halley Halley's Comet happened Hubble Space Telescope Hyakutake's inner solar system International Comet Hale-Bopp intrinsic brightness January July Jupiter Jupiter's located look March meteor shower Mexico mid-northern latitudes months morning sky motion naked eye northeast northern object Observatory occur October Oort Cloud orbital period perhaps perihelion perihelion distance Photograph taken planets position possible predicted probably Quadrantids recent scientists seen September sight skies solar system southern hemisphere spectacular Thomas Bopp traveling usually viewing WESTERN HORIZON