On the brightness of comet P/Halley in the past

Details On the brightness of comet P/Halley in the past On the brightness of comet P/Halley in the past

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..631g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 8, p. 631-634

Physics

Brightness, Halley'S Comet, Magnitude, Orbital Mechanics, Histories, Perihelions, Periodic Variations

Scientific paper

This paper deals with the brightness changes of comet P/Halley in the past. On the basis of the analysis of Sun-Earth-comet configuration at the time of perihelion passage within 30 apparitions of the comet, since 240 BC, several groups of apparitions of similar observing geometry were specified. These groups were analyzed with emphasis on brightness variations of the comet on different, lone time scales. Absolute magnitudes and duration of naked-eye visibility both in pre-perihelion and post-perihelion periods of the comet are the main criteria for the aim of this study. Some brightness increase of the comet in 912-1222 is indicated.

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