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Astron. Astrophys. 324, L61-L64

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Letter to the Editor

Short-term variability in comet C/1995 O1 Hale-Bopp

Rodríguez E., Ortiz J.L., López-González M.J., Rolland A., Hobart M.A.*, Sánchez-Blanco E., Gutiérrez P.J.,
and López-Moreno J.J.

Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, E-18080 Granada, Spain

Received 17 April 1997 / Accepted 12 June 1997


Simultaneous uvby Strömgren photometric observations of the comet Hale-Bopp have been collected during nearly three weeks. The Fourier transform method has been used to analyse the periodicities in luminosity present in this comet. Two different periodicities have been found: a long period of 7.19 days and a shorter one of 5.5 hours. The 5.5-hour periodicity may correspond to a full rotation of 11 hours whereas the 7.19-day periodicity could be related with the precession period. Other possibilities are discussed.

Key words: comets: individual: Hale-Bopp - techniques: photometric

Send offprint requests to: E. Rodríguez. E-mail: <eloy@iaa.es>
*on leave from Facultad de Física, Universidad Veracruzana, Mexico

© European Southern Observatory (ESO) 1997