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Spectrophotometry of 25 comets - Post-Halley updates for 17 comets plus new observations for eight additional cometsThe best possible production figures within the current post-Halley framework and available observations are given for H2O, O(1D), CN, C3, C2 and dust in 25 comets. Of these, the three objects with the smallest mixing ratios of all minor species have moderate to little or no dust and appear 'old'. Comets with large amounts of CN are very dusty, and there is a clear correlation of CN with dust, although comets with little or no dust still have some CN. Thus, CN appears to have at least two sources, dust and one or more parent gases. Also, the C2/CN production ratio changes continuously with heliocentric distance in every comet considered, suggesting that C2 production may be a function of coma density as well as parental abundance. Dust production ranges from essentially zero in Comet Sugano-Saigusa-Fujikawa up to 67,000 kg/s for Halley on March 14, 1986.
Document ID
19890039128
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Newburn, Ray L., Jr. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Spinrad, Hyron (California, University Berkeley, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1989
Publication Information
Publication: Astronomical Journal
Volume: 97
ISSN: 0004-6256
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-85-42631
CONTRACT_GRANT: NAGW-270
Distribution Limits
Public
Copyright
Other