Dust in Comet p/ Halley from VEGA Observations

Details Dust in Comet p/ Halley from VEGA Observations Dust in Comet p/ Halley from VEGA Observations

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..699m&link_type=abstract

Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 699, 1987

Astronomy and Astrophysics

Astrophysics

55

Scientific paper

Direct measurements of the dust particle spatial and mass distributions in comet Halley have been carried out on Vega spacecraft over the mass range ˜10-16 - 10-6g with the SP-2 dust particle detector consisting of a set of acoustic and impact plasma sensors. These measurements have revealed a large-scale, time-variable structure of the dust coma, the position and characteristics of its boundaries, and a strongly pronounced angular directivity of dust emission from the cometary nucleus. An unexpectedly high concentration of tiny dust particles with masses below 10-14g and strong systematic variations of the shape of the particle mass distribution as a function of distance to the cometary nucleus have been observed. The mean dust production rate by the nucleus has been estimated at (10 - 13)×106g s-1 (Vega 1) and (5 - 7)×106g s-1 (Vega 2).

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