Polarimetric Observations of Asteroids in Different Taxonomic Classes
Kang-Shian Pan1*, Wing-Huen Ip1
1Graduate Institute of Astronomy, National Central University, Taoyuan, Taiwan
* Presenter:Kang-Shian Pan, email:m989005@astro.ncu.edu.tw
Polarimetic measurements of asteroids provide a key information to their surface composition and albedos. This is because asteroids of different taxonomic types, i.e., C-type, S-type, B-type and M-type, have characteristic polarization curves as functions of the phase angle. The Triple Range Imager and Polarimeter instrument (TRIPOL) of compact design at Lulin Observatory has been used for polarimetric observations of a number of bright asteroids during 2015-2017. The targets include (24) Themis, (3) Juno, (2) Pallas, (16) Psyche, and more. Our results are in general agreement with previous work thus demonstrating that our TRIPOL system is of high quality. We will also discuss how photo-polarimetric observations can be used to examine surface inhomogeneities of a few prime targets of space missions like 16 Psyche and 216 Kleopetra.

Keywords: polarimetry, asteroid, taxonomy