A re-evaluation of the Haser model scale lengths for comets

Details A re-evaluation of the Haser model scale lengths for comets A re-evaluation of the Haser model scale lengths for comets

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2609c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Dec. 1985, p. 2609-2614.

Astronomy and Astrophysics

Astronomy

77

Abundance, Astronomical Photometry, Comet Nuclei, Comets, Scale Models, Signal To Noise Ratios, Carbon, Cyanides, Comets, Models, Photoelectric Methods, Crommelin, Austin, Tuttle, Stephen-Oterma, Kopff, Cyanide, Molecules, Density, Data

Scientific paper

The author examines the scale lengths for the Haser (1957) model using new, photoelectric, high signal-to-noise ratio data on a variety of comets. The comets have heliocentric distances from 0.75 to 1.81 AU. He shows that the scale lengths for C2 and C3 compiled by A'Hearn (1982) and Newburn and Spinrad (1984) do not adequately represent the data for most of the comets. The author derives new scale lengths for these two molecules. CN scale lengths are discussed. It is shown that an Rh2 variation for the scale lengths works for most molecules but that the C2 parent scale length must vary by Rh2.5.

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