PREDNASAJUCI / LECTURER :

Anhelina Voitko

NAZOV / TITLE :

Variations of cometary dust color using the archive of the Skalnaté Pleso observatory

ABSTRAKT / ABSTRACT :

Our work is aimed at studying the microphysical properties of cometary
dust particles. To fulfill our task, we consider the photometric color
of distant comets, as it is dependent on dust particle chemical composition
and size distributions. Therefore, we are looking for dust color variations
of distant comets, which can be explained by some variations of dust particle
properties, their fragmentation, sublimation, etc.
As a primary data source for our research, we use the archive of the Skalnaté
Pleso observatory. We have systematized archive data in a database, including
information about the number, duration, and quality of expositions, used instruments,
and calibration availability. We selected dense observations of comets at heliocentric
distances larger than 3 au with a maximum pause of fewer than 3 days. Among 8 comets,
4 of them did not possess strong color variations. We analyze these results and use
the agglomerated debris particle model for the interpretation of color dust variation
in comas of selected comets.