NASA NTRS · 19810008445
The Comet Halley handbook: An observer's guide
Abstract
The orbit of Comet Halley is described as well as its expected physical behavior (brightness, tail lengths, coma diameters) in 1985-1986 during which time its preperihelion positon will allow better conditions for Northern Hemisphere observers. Southern Hemisphere observers will prefer post perihelion observation. Ephemeris data for 1981-1987 are presented in tables.
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Yeomans, D. K.. 1981-01-15. The Comet Halley handbook: An observer's guide. https://ntrs.nasa.gov/citations/19810008445
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