Earth, Moon, and Planets

, Volume 89, Issue 1, pp 3–25

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

  • Yanga R. Fernández

DOI: 10.1023/A:1021545031431

Cite this article as:
Fernández, Y.R. Earth, Moon, and Planets (2000) 89: 3. doi:10.1023/A:1021545031431


A review of our current understanding of Comet Hale-Bopp’s nuclear size is presented. Currently the best constraints on the effective radiusare 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”.

Comets Hale-Bopp 

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Yanga R. Fernández
    • 1
  1. 1.Institute for AstronomyUniversity of HawaiiHonoluluUSA

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