Polarimetric Observations of 4179 Toutatis in 1992/1993

Details Polarimetric Observations of 4179 Toutatis in 1992/1993 Polarimetric Observations of 4179 Toutatis in 1992/1993

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..127..452m&link_type=abstract

Icarus, Volume 127, Issue 2, pp. 452-460.

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7

Scientific paper

Our polarimetric measurements of asteroid 4179 Toutatis in 1992 and 1993 have been reexamined, taking into account careful error analyses of the raw data. The resulting values of the polarization degree P and its position angle at wavelengths of 0.42, 0.46, 0.53, 0.65, 0.70, and 0.76 μm are reported for a range of phase angle, alpha, between 13 deg.6 and 93 deg.7. A weak decrease in P with wavelength has been found at alpha >= 50 deg. In addition, a small increase in P with increasing phase angle has been confirmed, i.e., a polarimetric slope of 0.09-0.15% deg^-1. Furthermore, we found a time variation of polarization and an occurrence of higher polarization in the dark phase of the light curve compiled by J. R. Spencer et al. (1995, Icarus 117, 71-89). Our polarimetric results plus other available data on 4179 Toutatis have confirmed that 4179 Toutatis is an S-type asteroid with an irregular shape and inhomogeneous surface composed in part of light-transmitting materials such as a mixture of olivine and pyroxene.

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