Abstract
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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Birkle, K. and Boehnhardt, H.: 1997, IAUC Circular No. 6583.
Buil, Ch.: 1994, QMiPS32 User Manual.
Facchini, M. and Nicolini, M.: 1997, Private Communication of the Cavezzo Observatory.
Jorda, L.: 1997, IAUC Circular No. 6583.
Jorda, L. et al.: 1997–1999, Earth, Moon Planets 77, 167–180.
Klinger, J.: 1981, ICARUS 47, 321.
Larson, S. M. and Sekanina, Z.: 1984, Astron. J. 89, 574–578.
Lecacheux, J. et al.: 1997, IAUC Circular No. 6560.
Licandro, J. et al.: 1998, Astrophys. J. Lett. 501, 221–225.
Mannucci, L. and Tozzi, R.: 1997, IAUC Circular No. 6574.
Manzini F. et al.: 1997, IAUC Circular No. 6463.
Maren, A. J. et al.: 1990, Handbook of Neural Computing Application, Academic Press, San Diego.
Masters, T.: 1994, Signal and Image Processing with Neural Networks, Wiley, New York.
Schulz, R. et al.: 1997–1999, Earth, Moon Planets 77, 299.
Schwarz, G. S. et al.: 1997, Earth, Moon Planets 78, 189–195.
Sekanina, Z.: 1996, IAUC Circular No. 6248.
Sekanina, Z.: 1997, IAUC Circular No. 6542.
Sekanina, Z.: 1997–1999, Earth, Moon Planets 77, 155–165.
Sekanina, Z. and Boehnhardt, H.: 1997, Earth, Moon Planets 78, 313–319.
West, R. and Kidger, M.: 1997, IAUC Circular No. 6587.
Williams, I. P.: 1997, Abstract from KYOTO IAU Conference (23 August 1997).
Wipple, F. L.: 1987, A&A 186, 852.
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Manzini, F., Crippa, R., Oldani, V. et al. Comet Hale—Bopp Shells Expansion: A CCD Study. Earth, Moon, and Planets 87, 73–85 (1999). https://doi.org/10.1023/A:1017597207597
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DOI: https://doi.org/10.1023/A:1017597207597