TITLE:
Peculiarities of short-periodic and long-periodic comets based on
polarimetric and spectral observations

AUTHOR:
Olena Shubina, Main Astronomical Observatory of NAS of Ukraine

ABSTRACT:
The results of spectral observations of comets 2P/Encke, 103P/Hartley 2,
C/2004 Q2 (Machholz), C/2009 P1 (Garradd), C/2012 J1 (Catalina),
polarimetrical observations of comets 2P/Encke, C/2012 J1 (Catalina) and
photometrical observations of comets 103P/Hartley 2, C/2013 UQ4 (Catalina)
are presented. Physical parameters as gas production rates of the
strongest molecular emissions, relative dust productivity (Afr parameter),
normalized gradient of reflectivity, degree of linear polarization were
calculated for these comets. Also, based on the second version of Database
of comet polarimetry it was studied some characteristics and features of
aperture polarization of short-periodic and long-periodic comets.