As comet Halley approaches
Article first published online: 3 JUN 2011
©1981. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 62, Issue 11, pages 105–107, 17 March 1981
How to Cite
1981), As comet Halley approaches, Eos Trans. AGU, 62(11), 105–107, doi:10.1029/EO062i011p00105-04.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
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The earliest probable recorded apparition of the comet Halley was 240 B.C., although what could be considered as data gathering on the comet was begun by Johannes Kepler in 1607. Kepler's observational data consisted of visual observation, which started on September 28 of that year and continued through the year, and then again in 1682, 1759, 1835–36, and 1909–11, the last of which was a precise telescopic observation. As we approach the arrival again of comet Halley in 1985, observers on the national scene are calculating the physical behavior to be expected. (The Comet Halley Handbook: An Observer's Guide Created for the International Halley Watch, D. K. Yeomans, Jet Propulsion Laboratory, Pasadena, Calif., 1981). A continuing search for the comet's arrival began in November 1977, but was unsuccessful. At that time the magnitude of the comet was estimated to be fainter than 26. When it arrives in 1985 it will be hard to see by the naked eye and probably will only be observed by those who are equipped with telescopes or binoculars and know where and when to observe. It will be necessary to observe outside of populous areas to avoid significant effects of artificial lighting.