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Cometary Science after Hale-Bopp pp 3–25Cite as

The Nucleus of Comet Hale-Bopp (C/1995 O1): Size and Activity

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Abstract

A review of our current understanding of Comet Hale—Bopp’s nuclear size is presented. Currently the best constraints on the effective radius are derived from late-1996 mid-IR data and near-perihelion radio data. Unfortunately the two regimes give differing answers for the radius. A possible reconciliation of the two datasets is presented that would place the radius at around 30 km. This is a large cometary radius compared to the others that are known, and this motivates a discussion of what makes a large comet different. From several possible large-comet properties, Hale—Bopp’s activity is analyzed, focusing on the production rates, coma jet features, dust optical depth, and relationship with the interplanetary dust environment. The optical depth is particularly important since an optically-thick inner coma could complicate attempted measurements of the “nucleus”.

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  1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA

    Yanga R. Fernández

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  1. Yanga R. Fernández
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Editors and Affiliations

  1. European Southern Observatory, Santiago, Chile

    H. Boehnhardt

  2. University of Michigan, Ann Arbor, USA

    M. Combi

  3. Instituto de Astrofísica de Canarias, Tenerife, Spain

    M. R. Kidger

  4. European Space Agency, Noordwijk, The Netherlands

    R. Schulz

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Fernández, Y.R. (2002). The Nucleus of Comet Hale-Bopp (C/1995 O1): Size and Activity. In: Boehnhardt, H., Combi, M., Kidger, M.R., Schulz, R. (eds) Cometary Science after Hale-Bopp. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1086-2_1

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  • DOI: https://doi.org/10.1007/978-94-017-1086-2_1

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