Comet Halley, parameter study I

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Description

To aid in defining a mission to comet P/Halley, its inner coma is simulated by a computer program that models time-dependent chemical reactions in a radially and isentropically expanding gas, taking into account attenuation of solar ultraviolet radiation in the subsolar direction. Column density predictions are based on intelligently selected combinations of poorly known values for nucleus parameters that include size, visual albedo, and infrared emissivity. Only one chemical composition and a minor modification of it are considered here; the dust-to-gas ratio in this model is zero. Although the somewhat optimistically volatile composition chosen here favors a smaller nucleus, a ... continued below

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Pages: 44

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Huebner, W.F. & Fikani, M.M. June 1, 1982.

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Description

To aid in defining a mission to comet P/Halley, its inner coma is simulated by a computer program that models time-dependent chemical reactions in a radially and isentropically expanding gas, taking into account attenuation of solar ultraviolet radiation in the subsolar direction. Column density predictions are based on intelligently selected combinations of poorly known values for nucleus parameters that include size, visual albedo, and infrared emissivity. Only one chemical composition and a minor modification of it are considered here; the dust-to-gas ratio in this model is zero. Although the somewhat optimistically volatile composition chosen here favors a smaller nucleus, a mean nuclear radius of only 0.5 km is unlikely. No significant increase of molecular column density is predicted by this model as a spacecraft approaches, once it is less than a few 10/sup 4/ km from the nucleus. Predictions are made for various heliocentric distances of interest for comet missions and for ground observations.

Physical Description

Pages: 44

Notes

NTIS, PC A03/MF A01.

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  • Other: DE82018352
  • Report No.: LA-9346-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5289438 | External Link
  • Office of Scientific & Technical Information Report Number: 5289438
  • Archival Resource Key: ark:/67531/metadc1065884

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • June 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

Description Last Updated

  • May 22, 2018, 12:17 p.m.

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Huebner, W.F. & Fikani, M.M. Comet Halley, parameter study I, report, June 1, 1982; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1065884/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.