Abstract
The results of V-band polarimetric observations of the potentially hazardous near-Earth Asteroid (23187) 2000 PN 9 at large phase angles are presented as well as its photometric observations in BVRI bands. Observations were made in March–April 2006 during its close approach to the Earth using the 1.82-m Asiago telescope (Italy) and the 0.7-m telescope at the Chuguevskaya Observational Station (Ukraine). We obtained polarimetric measurements at the phase angle of 115°, the largest phase angle ever observed in asteroid polarimetry. Our data show that the maximum value of the polarization phase curve reached 7.7% and occurred in the phase angle range of 90–115°. The measured values of linear polarization degree, BVRI colors and magnitude-phase dependence correspond to the S-type composition of this asteroid. Based on our observations the following characteristics of the Asteroid (23187) 2000 PN 9 were obtained: a rotation period of 2.5325 ± 0.0004 h , a lightcurve amplitude of 0.13 mag, an albedo of 0.24 ± 0.06 and a diameter of 1.6 ± 0.3 km .
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