Comet Hale-Bopp shells expansion: A CCD study

Citation
F. Manzini et al., Comet Hale-Bopp shells expansion: A CCD study, EARTH MOON, 87(2), 1999, pp. 73-85
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
EARTH MOON AND PLANETS
ISSN journal
0167-9295 → ACNP
Volume
87
Issue
2
Year of publication
1999
Pages
73 - 85
Database
ISI
SICI code
0167-9295(1999)87:2<73:CHSEAC>2.0.ZU;2-8
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 come t Hale-Bopp between May 1996 and May 1997. In addition to confirming the mo del of Sekanina and Bohenhardt (1997), the study of the linear jets provide d indications concerning the orientation of the comet's axis of rotation ov er 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 eff ect on the axis of rotation of the comet's nucleus could explain this behav ior.