Comet Bowell (1980b) - Measurement of the optical thickness of the coma and particle albedo from a stellar occultation

Details Comet Bowell (1980b) - Measurement of the optical thickness of the coma and particle albedo from a stellar occultation Comet Bowell (1980b) - Measurement of the optical thickness of the coma and particle albedo from a stellar occultation

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..446l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 58, June 1984, p. 446-450.

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9

Albedo, Comet Heads, Optical Thickness, Stellar Occultation, Carbonaceous Materials, Interplanetary Dust, Light Curve, Photometers, Comets, Bowell, Optical Properties, Thickness, Comae, Particles, Dust, Albedo, Occultations, Absorption, Mass, Comet Nuclei, Photometry, Comparisons, Experiments, Photometer, Equipment, Photographs, Data

Scientific paper

Comet Bowell (1980b) was observed to pass within 0.25 + or 0.09 arc sec of a star (about 540 km at the comet), where the absorption of starlight by the dust coma was found to be 3 percent (+ or - 1 percent). The implied optical thickness of 0.03 differs greatly from other determinations and gives a mass of 3 x 10 to the 13th g for the coma within 10,000 km of the nucleus. Coupled with absolute continuum filter photometry, these results indicate a very low particle albedo consistent with fluffy carbonaceous material. This experiment indicates the need to observe nearly central occultations by several observers to measure the optical thickness profile of a comet. The advantages of using a charge-coupled device area photometer for such observations are discussed.

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