Comet Halley | Published:

IUE observations of comet Halley during the Vega and Giotto encounters

Nature volume 321, pages 361363 (15 May 1986) | Download Citation

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Abstract

The observations of comet Halley from the International Ultraviolet Explorer (IUE) satellite from 9 to 16 March 1986 allow a comprehensive study of gas and dust production by the comet in the week during which the fleet of six spacecraft from four space agencies encountered the comet. The gaseous output of the nucleus was found to vary over timescales of the order of one or two hours. The Vega 2 probe crossed Halley's coma at the time of, or shortly after, the onset of a strong outburst. The Giotto spacecraft performed its measurements while the cometary nucleus was near a minimum of activity. The ultraviolet spectrum of comet Halley differs from that of other comets observed by the IUE satellite in that the continuum emission is very strong relative to the gaseous emissions, and the CO2+ violet bands, if present, are weak. The rate of water production was estimated to be 5.6×1029 and 5.2×1029 molecules per second at the time of the Vega 2 and Giotto encounters, respectively, while atomic carbon was a few per cent and CO 10–20% of these values.

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Change history

  • 27 March 2018

    This article was initially published with an incorrect DOI that did not match the registered version at Crossref. The DOI has been corrected in the article.

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Author information

Affiliations

  1. Observatoire de Besançon, 25000 Besançon, France

    • M. C. Festou
  2. Johns Hopkins University, Baltimore, Maryland 21218, USA

    • P. D. Feldman
    •  & H. A. Weaver
  3. University of Maryland, College Park, Maryland 20742, USA

    • M. F. A'Hearn
    •  & L. A. McFadden
  4. Institut d'Astrophysique de Liège, B-4200 Liège, Belgium

    • C. Arpigny
  5. IFSI-CNR, 0044 Frascati, Italy

    • C. B. Cosmovici
  6. Michigan State University, East Lansing, Michigan 48824, USA

    • A. C. Danks
  7. IUE Tracking Station, ESA/Vilspa, 28080 Madrid, Spain

    • R. Gilmozzi
  8. Osservatorio Astrofisico di Arcetri, 50125 Firenze, Italy

    • P. Patriarchi
    •  & G. P. Tozzi
  9. University College, Cardiff CF1 1XL, UK

    • M. K. Wallis
  10. Guest observer with the IUE satellite.

    • M. C. Festou
    • , P. D. Feldman
    • , M. F. A'Hearn
    • , C. Arpigny
    • , C. B. Cosmovici
    • , A. C. Danks
    • , R. Gilmozzi
    • , P. Patriarchi
    • , G. P. Tozzi
    • , M. K. Wallis
    •  & H. A. Weaver

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https://doi.org/10.1038/321361a0

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