Similarity and diversity in photometric and polarimetric opposition effects of small Solar System bodies |
| |
Authors: | Vera Rosenbush Nikolai Kiselev Viktor Avramchuk |
| |
Institution: | aMain Astronomical Observatory of National Academy of Sciences, Zabolotnoho str. 27, 03680 Kyiv, Ukraine bInstitute of Astronomy of Karazin Kharkiv National University, Sumskaya str. 35, 61022 Kharkiv, Ukraine |
| |
Abstract: | The phase-angle dependences of brightness and polarization of light scattered by atmosphereless Solar System bodies (satellites, asteroids, planetary rings) as well as comets and zodiacal light are analysed on the basis of available ground-based and spacecraft observations. We study similarity and diversity in the photometric and polarimetric opposition effects. The similarity of the brightness and polarization phase functions for polydisperse dust media (cometary and interplanetary dust) and for atmosphereless bodies at small phase angles gives grounds to state that at least some physical properties of dust particles and light-scattering mechanisms should be similar for the two classes of objects. The aggregate structure of particles in different objects can be precisely the property that determines the photometric and polarimetric effects observed in the opposition region. Differences observed in opposition effects for different objects are likely caused by different physical properties (composition, sizes, structure, density) of the scattering particles and, therefore, by different relative contributions of the light-scattering mechanisms. However, the relationship between the photometric opposition effect, spike effect, negative polarization branch, and polarization opposition effect for different bodies is ambiguous. |
| |
Keywords: | Opposition effect Negative polarization Coherent backscattering |
本文献已被 ScienceDirect 等数据库收录! |
|