Hunting Halley's comet.

Details Hunting Halley's comet. Hunting Halley's comet.

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..45....6c&link_type=abstract

The Messenger, vol. 45, p. 6-8

Astronomy and Astrophysics

Astronomy

Comet 1910 Ii Halley

Scientific paper

Observers of bright comets have always been fascinated by the sight of these rare phenomena. However, it was as late as the 19th century that scientists started to make systematic observations of the appearance of comets and recorded them in the form of drawings and descriptions of comas and tails. Halley's comet in particular was observed intensively because the time of its return was weil known. The first photographic observations of the comet were made during its 1910 perihelion. A large number of photographs were taken using astronomical instruments of all dimensions showing structures within the extended ion tail and the bright coma. Pictures from that time are weil suited to be compared with recently obtained images of the 1986 appearance, although observing conditions were then much less favourable. Just when PI Halley was most active, at its brightest, and thus most interesting, namely during its perihelion passage, it was behind the Sun and unobservable. During the 2,000 years that observations of this comet have been recorded, there was only one appearance where the positions of Sun, Earth and comet were even worse for observations. In addition, the observing conditions in the northern hemisphere were extremely bad because at its best time the comet followed its path through the southern skies. Thus the only way to observe P/ Halley successfully after its perihelion passage was to got to the southern hemisphere. At a latitude of 30 degrees south the comet culminated near the zenith.

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