Volume 407, Number 2, August IV 2003
|Page(s)||L37 - L40|
|Published online||17 November 2003|
Letter to the Editor
New spin period determination for comet 6P/d'Arrest
Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France
2 Instituto de Astrofísica de Canarias, C/Via Lactea s/n, 38200 La Laguna, Tenerife, Spain
3 Isaac Newton Group of Telescopes & Instituto de Astrofísica de Canarias, PO Box 321, 38700 Santa Cruz de La Palma, Tenerife, Spain
4 Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
Corresponding author: P. J. Gutiérrez, firstname.lastname@example.org
Accepted: 3 July 2003
A lightcurve of comet 6P/d'Arrest from R-band CCD images taken at La Palma 2.52 m NOT telescope is presented. The lightcurve shows noticeable periodic changes in brightness produced by rotational modulation. The periodogram analysis of the lightcurve shows a peak with a confidence level exceeding 99.9% at 3.336 h. Assuming an elongated nucleus, the most likely spin period is therefore 6.67 ± 0.03 h, but other periodicities are also possible. The peak to peak amplitude is 0.082 ± 0.016 mag. This period, and the other peaks detected in the periodogram, are not commensurable with previous estimates of the spin period of comet 6P/d'Arrest. If all the measurements are correct, the differences between this estimate and the previous ones could be due to a possible change in the spin period of comet 6P/d'Arrest or to this comet being rotating in a complex mode.
Key words: comets: individual: 6P/d'Arrest
© ESO, 2003
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