The Diagnosis of Complex Rotation in the Lightcurve of 4179 Toutatis

Details The Diagnosis of Complex Rotation in the Lightcurve of 4179 Toutatis The Diagnosis of Complex Rotation in the Lightcurve of 4179 Toutatis

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.0808m&link_type=abstract

American Astronomical Society, DPS Meeting #32, #08.08; Bulletin of the American Astronomical Society, Vol. 32, p.1003

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We revisit the visible lightcurve data on 4179 Toutatis (Spencer et al. 1995) to recover the signature of its excited spin state with an application of our Fourier transform and WindowCLEAN algorithms (Roberts et al. 1987, Belton 1991). WindowCLEAN yields clear and precise signatures of periodicities associated with the precession of the long axis about the total angular momentum vector (0.135 +/- 0.008 dy-1, 0.271 +/- 0.008 dy-1) and the combination of precession and rotation (LAM state), or oscillation (SAM state), about the long axis (0.643 +/- 0.008 dy-1). These periodicities are effectively the same as those found in the model calculations of Kryszczyńska et al. (1999). For an assumed LAM state, our periodicities yield a mean long axis precession period Pφ = 7.41 +/- 0.4 dy and a period of rotation around the long axis of Pψ = 5.38 +/- 0.5 dy which compares well with the values of 7.35 dy and 5.41 dy found in the analysis of radar data (Hudson and Ostro 1995). We explain why the dramatic change in the Earth-Toutatis-sun geometry during the time that the lightcurve was obtained, and which we had originally thought would undermine the derivation of 4179 Toutatis periods by Fourier analysis, has little effect on the results obtained. Using the 4179 Toutatis example as a guide we discuss limitations on deriving information about complex spin states from asteroidal light curves. This work is supported by a Planetary Astronomy Grant from NASA. References: Belton, M.J.S., 1991. In Comets in the Post-Halley Era 2, Eds. R.L. Newburn Jr. and J. Rahe. Kluwer Academic Publishers. pp. 691-721. Hudson, R.S. and S.J. Ostro 1995. Science 270, 84-86. Kryszczyńska, A., T. Kwiatkowski, S. Breiter, and T. Micha\l owski 1999. Astron. Astrophys. 345, 643-645. Spencer, J.R. et al. 1995. Icarus 117, 71-89. Roberts, D.H., J. Lehar, and J.W. Dreher 1987. Astron. J. 93, 968-989.

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