Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icq....23...16b&link_type=abstract
International Comet Quarterly (ISSN 0736-6922), Vol. 23, No. 1, (No. 117), p. 16 - 22 (2001)
Physics
Comets, Rotation Periods, Comet C/1995 O1 (Hale-Bopp)
Scientific paper
Comet C/1995 O1 (Hale-Bopp) has presented a wealth of highly contrasted structures in its inner coma during spring 1997. Using mainly a 25.6-cm telescope, recurring structures (such as arcs of curved jets) in the inner coma of comet C/1995 O1 were drawn on a weekly to daily basis from 1997 February 6 to May 18. After a careful scaling measurement of the positions of these features, based on 93 drawings, has enabled an accurate determination of their recurrence period. A first look suggested a period between 7 and 10 days. But some specific observations did show that this was an aliasing effect: indeed, just a little more than two cycles took place every 24 hours. Taking this effect into account, the synodic "rotation period" of comet C/1995 O1 is derived from a three-parameter least-squares linear fit to the expanding shells. Observations spanning from 49 days before to 44 days after perihelion have been used to derive a mean period of 11.33 ± 0.04 hr. If this period did vary on a timescale larger than about ten days during these three months of observations, then the variation should have been within 0.1 hr of the given value.
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