Comet Hale—Bopp Shells Expansion: A CCD Study

Details Comet Hale—Bopp Shells Expansion: A CCD Study Comet Hale—Bopp Shells Expansion: A CCD Study

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001em%26p...87...73m&link_type=abstract

Earth, Moon, and Planets, v. 87, Issue 2, p. 73-85 (1999).

Physics

3

Comet Hale-Bopp, Jets, Precession, Rotation Axis, Shells, Comet Hale&Ndash, Bopp, Jets, Precession, Rotation Axis, Shells

Scientific paper

Using a CCD camera attached to the 0.335 m and 0.20 m reflectors of S.A.S. Observatory (Novara, Italy), we followed the linear jets and shells of comet Hale Bopp between May 1996 and May 1997. In addition to confirming the model of Sekanina and Bohenhardt (1997), the study of the linear jets provided indications concerning the orientation of the comet's axis of rotation over time. The study of the shells revealed that the speed at which they move away from the nucleus was not constant. A periodic variation of the shell expansion velocity may not be excluded : if so, a possible precessional effect on the axis of rotation of the comet's nucleus could explain this behavior.

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