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Trigo Drawing of Comet Hale-Bopp


Observer: Josep Trigo
Location: Benicassim (Castellon), Spain
Date: March 9, 1997 04:55-05:30 UT

I send my observations of March 8th and 9th. During the morning of 9th I realize a draw (and photographies) of internal coma region that it is very impresive. The figure shows various near-nucleus structures expanding away. The appearance at 117X is that a whole series of bright shells of material are being ejected. These shells are very bright but their intensity decrease radially from the nuclei region. The large shells are slowly expanding away from the nucleus as is noted in the two sequences realizated at 4h55m UT and 5h30m UT. In the last draw that appear in the box can you see how a new jet appear near the nuclei. In the draw at least four shells are visible with my instrument (T) 173/1050mm but other external regions show bright zones more diffuse: these condensations develop and they expand slowly and lose surface brightness, becoming indistinguishable from the rest of the coma.

The comet visually is very bright and at least four degrees of tail are = visible. With binoculars several ionic tails they are visible and the tail is of 10 deg. aproximately. The limiting magnitude was +6.10.

Josep Trigo

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