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Spectrophotometry of seventeen comets. II - The continuumOne-hundred-twenty IDS scans of the continua in 17 comets are analyzed to determine dust production rates and color as a function of heliocentric distance. Improved theory indicates that the dust loading of gas typically varies between 0.05 and 0.3 by mass (assuming a geometric albedo of 0.05 and oxygen expansion at 1 km/s) except during outbursts, when it rises much higher. P/Encke near perihelion falls much lower yet, to 0.004 or less. Dust loading is not always constant as a function of time in a given comet. Dust color is typically reddish, as has often been noted before.
Document ID
19860033530
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Newburn, R. L., Jr. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Spinrad, H. (California, University Berkeley, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: Astronomical Journal
Volume: 90
ISSN: 0004-6256
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-81-16187
CONTRACT_GRANT: NAGW-270
Distribution Limits
Public
Copyright
Other