Comet Halley | Published:

IUE observations of comet Halley during the Vega and Giotto encounters

Subjects

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.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

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.

References

  1. 1

    Festou, M. C., Feldman, P. D., Weaver, H. A. & A'Hearn, M. F. Eur. Space Ag. spec. Publ. 176, 445–449 (1981).

  2. 2

    Feldman, P. D. Science 219, 347–354 (1983).

  3. 3

    Feldman, P. D. Adv. Space Res. 4, 177–184 (1984).

  4. 4

    Festou, M. C., Feldman, P. D. & Weaver, H. A. Astr. Astrophys. 155, L17–L18 (1986).

  5. 5

    A'Hearn, M. F. in Comets (ed. Wilkening, L. L.) 433–460 (University of Arizona Press, Tucson, 1982).

  6. 6

    Festou, M. M. et al. Astrophys. J. 256, 331–338 (1982).

  7. 7

    Feldman, P. D. et al. Astr. Astrophys. 131, 394–398 (1984).

  8. 8

    Festou, M. C. Astr. Astrophys. 96, 52–57 (1981).

  9. 9

    Schleicher, D. G. & A'Hearn, M. F. Astrophys. J. 258, 876–883 (1982).

  10. 10

    Feldman, P. D. et al. Nature 286, 132–135 (1980).

  11. 11

    Feldman, P. D. in Asteroids, Comets, Meteors II (eds Lagerkvist, C. F. Lindblad, B. A., Lundstedt, H. & Rickman, H.), 263–268 (Uppsala University Press, 1985).

  12. 12

    Azoulay, G. & Festou, M. C. in Asteroids, Comets and Meteors II (eds Lagerkvist, C. F., Lindblad, B. A., Lundstedt, H. & Rickman, H.) 273–278 (Uppsala University Press, 1985).

  13. 13

    Festou, M. C. Adv. Space Res. 4, 9, 165–175 (1984).

Download references

Author information

Rights and permissions

To obtain permission to re-use content from this article visit RightsLink.

About this article

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.