Observations

The observations of comets C/1996 Q1 (Tabur) and C/1995 Ol (Hale-Bopp) were made at the 2 meter RCC Zeiss telescope at the Pik Terskol Observatory (Northern Caucasus) using the Max-Planck-Institut für Aeronomie Two-channel Focal Reducer [1], The red (643 nm) and blue (443 nm) narrow-band continuum filters were used. Comet C/1996 B2 (Hyakutake) was observed using the lm Cassegrain reflector at the Hoher List Observatory near Bonn, Germany and a somewhat improvised focal reducer that employed in a single channel setup. Details of the observational conditions, processing of the images and the complete images of the comets are presented in [5] and [7]. In this paper we pay attention to the solar-antisolar trends (Figures 1 and 2) concentrating on the innermost coma (R < 1000 km for comets Hyakutake and Tabur and R < 5000 km for comet Hale-Bopp).

Figure 1. Profiles of colour, C, and polarization, P, for comet Hyakutake (left panel, the solid line shows the data for March 30, 1996 and the dotted lines are for April 1, 1996); colour, polarization, and polarimetric colour, PC (the difference in polarization observed at 642 and 443 nm), for comet Tabur (right panel, October 10, 1996) done along the solar(+)/antisolar( —) direction.

Figure 1. Profiles of colour, C, and polarization, P, for comet Hyakutake (left panel, the solid line shows the data for March 30, 1996 and the dotted lines are for April 1, 1996); colour, polarization, and polarimetric colour, PC (the difference in polarization observed at 642 and 443 nm), for comet Tabur (right panel, October 10, 1996) done along the solar(+)/antisolar( —) direction.

R, 1000 km

R, 1000 km

Figure 2. Profiles of colour, C, polarization, P, and polarimetric colour, PC (the difference in polarization observed at 642 and 443 nm), for comet Hale-Bopp (March 31, 1997) done along the solar(+)/antisolar( —) direction.

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