The dust tail of Comet Halley

Details The dust tail of Comet Halley The dust tail of Comet Halley

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..639f&link_type=abstract

In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 639-644 (SEE N88-21884 14-91)

Physics

Comet Tails, Cosmic Dust, Halley'S Comet, Particle Production, Particle Mass, Particle Size Distribution, Photometry, Time Dependence, Velocity Distribution

Scientific paper

Photometric analysis of 10 wide field CCD images (702 nm and RG830 filters) of Halley between Feb. 24, and Apr. 5, 1986, is summarized. Derived isophote fields were used as input for the inverse approach to the Finson-Probstein method for interpreting cometary dust tails. This yields: dust ejection velocity of the dust from the inner coma; time-dependent dust size distribution; dust mass production rate; dust number production rate; and time-averaged dust size distribution. The error affecting the solutions = 50 percent. The results concern sizes between 0.7 and 300 microns ejected in the period between Jan. 15, and Mar. 15, 1986. The power index of the size distribution varies from -1 to -2 in January to -3 to -4 after the perihelion. On Mar. 13, 1986, (Giotto flight) small particles are predominant with a power index of -3.52, in agreement with the Giotto value of -3.48. The time-behavior of the dust production rate is very close to that of long-period Comet Bennett 1970II: the number rate increases by a factor 100,000, whereas the mass loss rate is constant. There is a weak indication of bursts possibly correlated with those claimed by Sekanina (1986).

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