Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..497b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 497-521.
Astronomy and Astrophysics
Astronomy
5
Comet Tails, Cosmic Dust, Halley'S Comet, Radiation Pressure, Solar Gravitation, Elliptical Orbits, Emission Spectra, Grain Size, Particle Size Distribution, Schmidt Telescopes, Space Plasmas
Scientific paper
Large-scale images of P/Halley, taken with the UK Schmidt telescope during the period November 1985 to July 1986 are described. Using Finson-Probstein (1968) dynamical theory, dates of major emission times are calculated and compared with dates of reported outbursts. The average duration of these emission times is 2 + or - 0.5 day. Dust grain sizes observed in the main tail range from submicron to micron sizes. The antitail, seen during February, gives a lower limit (of about 120 microns) to the maximum grain size detectable using the Schmidt plates. There is evidence for very small and/or low density grains which exist on orbits for which the force due to radiation pressure exceeds the solar gravitational attraction. Only grains of size greater than 10 microns move into elliptical orbits, thus contributing to the zodiacal cloud.
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