Observation of comet Halley by the ultraviolet imager of Suisei

Details Observation of comet Halley by the ultraviolet imager of Suisei Observation of comet Halley by the ultraviolet imager of Suisei

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..297k&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 297-299.

Astronomy and Astrophysics

Astronomy

29

Coma, Halley'S Comet, Lyman Alpha Radiation, Spaceborne Astronomy, Ultraviolet Astronomy, Comet Nuclei, Imaging Techniques, Japanese Spacecraft, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Suisei, Ultraviolet Imaging Experiment, Lyman-Alpha Radiation, Intensity, Comae, Comet Nuclei, Periodicity, Comet Tails, Source, Brightness, Photometry, Hydrogen, Imagery, Equipment, Procedure

Scientific paper

Images of comet Halley's hydrogen coma were recorded by the ultraviolet imager aboard the Suisei spacecraft from November 26, 1985 to the present (except for the period between January 11 and February 8, 1986). The variation in the Lyman-alpha intensity over time is indicated schematically. The hypothesis that the nuclear surface of Halley is largely covered with a hard substance is confirmed by the occurrence of strong breathing at the hottest phase of the apparition in the same pattern as was observed initially. Photometry was used to determine the positions of outburst sources in one 2.2-day rotational period. It was found that two strong sources and at least four weak sources contribute to this periodic breathing; most of the sources fall on two-thirds of each activity cycle. It is noted that the obtained photometry data are in agreement with a theoretical curve which took the effect of periodic outbursts into account.

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