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Polarimetric and Photometric Phase Effects Observed on Transneptunian Object (29981) 1999 TD10 |
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| Authors: | P Rousselot A C Levasseur-Regourd K Muinonen J-M Petit |
| Institution: | 1. Observatoire de Besan?on, PB 1615, 25010, Besan?on Cedex, France 2. Université Paris VI/Aéronomie CNRS-IPSL, BP 3, 91371, Verrières, France 3. Observatory, University of Helsinki, PO Box 14, 00014, Helsinki, Finland |
| Abstract: | The Kuiper-Belt Object (29981) 1999 TD10, classified as a Scattered-Disk Object, has been observed at three different phase angles with the ESO 8.2-m VLT and FORS 1 instrument in polarimetric mode in November and December 2003. These observations have been used to compute the Stokes parameter q, which represents the linear polarization degree. We have also used the previously published photometric observations to improve the R-band phase function. The main conclusions are as follows: (i) a negative linear polarization degree decreasing with phase angle α up to, at least, α=3°, (ii)  for α=3°, (iii) a possible color effect between the R and V band, the polarization degree being more negative in R. The R-band polarimetric observations can be explained by the coherent-backscattering mechanism and fitted by a two-component Rayleigh-scatterer model for a spherical small body. The rotation period of 15.382±0.001 h published by Mueller et al. (2004, Icarus
171, 506–515) and Choi et al. (2003, Icarus
165, 101–111) is confirmed. The R-band phase curve provides H=8.35±0.02 and G=−0.25±0.022 parameters with the IAU H–G formalism.Based on observations obtained at the Cerro Paranal observatory of the European Southern Observatory (ESO) in Chile. |
| Keywords: | Transneptunian objects polarimetry photometry (29981) 1999 TD10 |
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