International projects

Investigation of development of the physical activity of dynamical new comets over the wide range of heliocentric distances

Program: SASPRO, SAV (FP7 and Marie Curie Actions)

Project leader: Oleksandra Ivanova PhD.

Duration: 25.02.2016 - 31.12.2018

Abstract:The main goal of the presented project is to study the physical properties of the atmospheres and tails in the dynamically new comets. The project is focused on the study of the evolution of physical activities of the comets depending on their distance from the Sun. The archived photometric, spectrophotometric, and polarimetric data, as well as the new observations of the comets at different heliocentric distances, will be used to solve this topic. Our objects are comets with a perihelion distance, q, in the range of 0.01 - 3 AU. In the first stage of the project, the observations of the selected comets (using different methods of observations) with higher activity at the large heliocentric distances (r>4 AU) will be presented. Here, we also include observational data, obtained by principal investigator (PI) of the presented project, based on the previous observations. In the second stage of project, the observations of new comets (with broadband filters (BVR), which will be active at large heliocentric distances (r>4 AU), will continue. We want to obtain further observations of the comets (with narrow band filters), which were observed at large heliocentric distances during the first stage of the project, but this time will be in a closer distance to the Sun (r<3 AU). In the final stage of the project, an analysis of the obtained spectroscopic, photometric and polarimetric data will be done: detection of gas emission, estimation of dust and gas productivity, morphology of dust and gas coma and estimation of the degree of polarization at large phase angles. We will construct light curves of the cometary brightness changes. Also, the estimations of refractive indexes, sizes and density of particles of comet dust will be done. To do these estimations, we use the photometric and spectropolarimetric observations and results of the measurements performed in space (taken from the literature) and based on a modelling.


    Results 2016

    Description of activities: Complex observations and data analysis of dust properties of dynamically new comets, which will be observed at large heliocentric distances, using different modes of observation (e.g. photometry, spectroscopy and polarimetry) and telescopes. Detection and indication of possible outbursts in comets, using simultaneous observations of the object with different telescopes." report in pdf