PREDNASAJUCI / LECTURER :

Oleksandra Ivanova

NAZOV / TITLE :

Quasi-simultaneous photometric, polarimetric,
and spectral observations of comet C/2014 B1 (Schwartz)
with perihelion distance 9.56 au

ABSTRAKT / ABSTRACT :

We present the results of the comprehensive observations of the unique
disk-like comet C/2014 B1 (Schwartz). Quasi-simultaneous long-slit spectra,
as well as photometric and polarimetric images with g-and r-sdss filters,
were obtained at the 6-m telescope of the SAO on 2017 January 23.
The BVR photometric observations were also carried out at the 2-m telescope
of the Peak Terskol Observatory on 2017 January 31. We did not reveal any emissions in the spectra.
The position of the two jets and the disk-like shape of the coma remained unchanged for more than 4 years.
The most realistic model for the explanation of the stable orientation of jets is the existence
of two active sources located near the north and south poles of the rotating.
The color of the jets is much redder than of the ambient coma.
There are spatial variations of the color and polarization over the coma.
Our modeling showed that the observed trends could be explained by the
fragmentation of aggregated particles, formed by CO2/H2O ices, silicates,
and organics, which are of a radius of 1 mm near the nucleus and near 1 μm at the periphery.