Photographic and Photoelectric Observations of Comet P/halley in 1985-86

Details Photographic and Photoelectric Observations of Comet P/halley in 1985-86 Photographic and Photoelectric Observations of Comet P/halley in 1985-86

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jass....6...57n&link_type=abstract

Journal of Astronomy and Space Sciences, vol.6, no1, p.57-72

Astronomy and Astrophysics

Astronomy

Scientific paper

A total of 80 photographs on 29 nights and anther total of 44(22 each in B and V) photoelectric observations on 6 nights are secured for P/Halley(198i) for seven months before and after the perihelion passage. The photographic observations have been made at different places depending on the position of the comet and the development of the tail, while the photoelectric observations were made only with the 61-cm reflector at Yonsei University Observatory(YUO). Four most representative photographs are presented only to illustrate the remarkable features of the comet. The second one of these shows a coma with a possible flash activity on 1985 SEPT. 18.56 UT. The third one shows the largest tail recorded among our plates, and the last represents unusual record made on a northern hemisphere at a latitude as high as about 33 deg +/- 12 deg N on the occasion of the comet's second perigee on 1986 ARP. 11.6 UT. Photoelectric observations, on the other hand, determine the V and B-V of the total and the coma of the comet before its perihelion passage, and exhibit the light variations of the 0.m6 in an hour and a half. Two new sets of mo and n, one before and the other after the perihelion passage, are determined based on the collected data, but the values are dissimilar one anther significantly.

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