Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..560g&link_type=abstract
Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 560, 1987
Astronomy and Astrophysics
Astrophysics
32
Scientific paper
The overall behavior of the total visual coma brightness of P/Halley during 1981-1987 is discussed. Observations used in this study include ˜75 published "V" magnitudes obtained with large telescopes (usually with CCDs) prior to July 1985 and ˜3500 total magnitudes (published in the International Comet Quarterly) estimated visually with smaller telescopes during the period July 1985-February 1987. We discuss the observed macroscopic light curve and provide preliminary least- square fits to the traditional power4aw formula. While the heliocentric brightness (H) variation with respect to heliocentric distance (r) did not follow expectations closely, P/Halley's maximum brightness during 1986 Feb.-Apr. fell somewhere between the most pessimistic and the most optimistic forecasts. We also review brightness variations on smaller timescales (hours, days), noting that several definite outbursts in total visual magnitude occurred during Oct. 1985-May 1986 which can be correlated with outbursts observed at other wavelengths.
Conway Morris Simon
Green Daniel W. E.
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