All Figures

$\begin{figure} \par\includegraphics[width=16cm,clip]{1766fig1.ps}\end{figure}$ Figure 1: Observations and related reductions: in $\vec a$ ), the original CCD images; in $\vec b$ ), a processed version of them; in $\vec c$ ), isophotes of the near-coma area; in $\vec d$ ), orbit plane views with the projected orientation of the sunward spike (dashed arrows), and the computed points of the theoretical Neck Line (black dots), sequentially numbered from the nucleus. Such points are projected on the plane of the sky, into the processed images in $\vec b$ ), as white dots with the same sequential number. Arrows r, r', +V, and -V, denote the direction to the Sun from the nucleus, the prolonged Sun-comet radius vector, and the tangential orbital velocity vector of the nucleus in the sense of the comet motion, and in the opposite sense. Arrows N and E denote North and East through the nucleus.
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In the text