Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..469n&link_type=abstract
Astronomical Journal, vol. 86, Mar. 1981, p. 469-475.
Astronomy and Astrophysics
Astronomy
9
Astronomical Photometry, Comets, Emission Spectra, Optical Filters, Spectrum Analysis, Visual Photometry, Abundance, Astronomical Models, Calibrating, Comet Nuclei, Continuous Radiation, Cosmic Dust, Cyanides, Data Reduction, Gas Flow, Ice, Comets, Ashbrook-Jackson Comet, Photometry, Spectrum, Models, Ice, Halos, Production Rate, Nucleus, Scattering, Flow, Gases, Observations, Calibration, Data Reduction, Data, Flux, Density, Emissions, Albedo, Grains, Volatile Elements
Scientific paper
Interference-filter photometry was performed on P/Ashbrook-Jackson in ten bands, λλ3090-5120, and with two diaphragms, 16".5 and 25".7, on 9 and 10 October 1978 at the 2.2- m reflector of the Mauna Kea Observatory. The spectrum was dominated by the continuum, which was reddish in color. Successful quantitative modeling of the data required either the presence of an icy halo or a major fluctuation in the production of material over the nucleus surface (or both). With no visible evidence of jets or shells, the former case was assumed. This required the presence of an icy halo that scatters about two-thirds of the light in the smaller diaphragm. The total volatile flow was about 43 kg s-1, roughly 85% gas and 15% icy grains, and the total nonvolatile flow was about 21 kg s-1. These exact figures are a function of the values assumed for albedos and particle densities, but the general conclusions remain firm.
Bell Jon F.
McCord Th. B.
Newburn Ray L.
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