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Polarimetry and BVRI photometry of the potentially hazardous near-Earth Asteroid (23187) 2000 PN9 |
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| Authors: | Irina N Belskaya Sonia Fornasier Yurij N Krugly |
| Institution: | a Institute of Astronomy, Kharkiv National University, 35 Sumska str., 61022 Kharkiv, Ukraine b LESIA, Observatoire de Paris, 5, pl. Jules Janssen, FR-92195 Meudon cedex, France c University of Denis Diderot, Paris VII, France |
| Abstract: | The results of V-band polarimetric observations of the potentially hazardous near-Earth Asteroid (23187) 2000 PN9 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 PN9 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. |
| Keywords: | Asteroids Near-Earth objects Polarimetry Photometry |
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