UBVRI-polarimetry of asteroid 4179 Toutatis

Details UBVRI-polarimetry of asteroid 4179 Toutatis UBVRI-polarimetry of asteroid 4179 Toutatis

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..113..200l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 113, no. 1, p. 200-205

Other

13

Apollo Asteroids, Astronomical Polarimetry, Linear Polarization, Space Observations (From Earth), Albedo, Phase Shift, Size Determination, Spectral Sensitivity

Scientific paper

UBVRI polarimetric observations of NEA 4179 Toutatis were carried out at the Crimean Astrophysical Observatory for six nights in December 1992-January 1993. Phase curves of polarization over the phase angle range 15.8-51.4 deg were obtained in each photometric band. Spectral dependences of positive polarization, polarimetric slope h, and inversion angle alphainv in UBVRI wavelength range were obtained for the first time. The degree of the linear positive polarization decreases with the increase of wavelength supporting the inversion effect of the polarization spectral dependence of S-type asteroids. The obtained observation data show a fact unknown for asteroids before - the presence of Toutatis polarization unconnected with the scattering plane. For the first time the polarimetric estimate of geometric albedo pv = 0.13 was obtained. Along with other data this value points out that Toutatis is an S-type asteroid having a tentative size of about 3 km.

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