DIGITAL IMAGES OF NUCLEAR REGION OF COMET HYAKUTAKE

The images are taken with the 33,5 cm reflector (f\4.8) of the S.A.S. Observatory, equipped with a CCD camera (based on the chip Kodak KAF-0400) and a NEAR INFRARED filter (Resolution =1,2"\pixel)
Observers : F.Manzini, (S.A.S.) R.Crippa, C.Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (Novara) , Italy
Date : March 22, 1996 20 U.T.

FIRST DETECTION OF NUCLEUS FRAGMENTATION
In the first image (HY2203.gif) some condensations are evident inside the linear jet at the beginning of the tail. The second image ( HY2203T.gif) is a tridimensional representation of the same condensations away from the nuclear region . Nucleus is located on the top of principal peak.

Observers : C. Bottari, F.Manzini . R.Crippa, C.Guaita
Location : SOZZAGO (Novara), Italy
Date : March 27, 1996 20 U.T.

FOUNTAIN JETS TOWARD THE SUN DIRECTION
First image (HY2703.gif) is an accumulation of many original frames of the nuclear region before elaboration. Second image (HY2703b.gif ) is a representation of fountain jets after many kind of elaborations. Third image (HY2703c.gif) is a color representation of nuclear region : fountain jets are evident in solar direction but also a fragment chain is visible in the linear jet toward the antisolar direction.

Observers : F.Manzini, (S.A.S.) R.Crippa, C.Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (novara), Italy
Date : April 04 , 1996 19.30 U.T.

MULTIPLE CONTINUOUS AND FRAGMENTED SHELLS
This image (HY0404.gif) shows the nuclear region before ( top right ) and after (left, bottom right) elaboration.
Observers : F.Manzini, (S.A.S.) R.Crippa, C. Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (Novara) , Italy
Date : April 07, 1996 19.30 U.T.

MULTIPLE JETS FEEDING A COMPACT SHELL
First image (HY0704.gif) shows a summary of different kinds of elaboration. Second image (HY0704b.gif) is a color rendition of the best elaboration result.
Observers : F.Manzini, (S.A.S.) R.Crippa, C.Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (Novara), Italy
Date : April 20, 1996 19.30 U.T.

MULTIPLE PLASMA FILAMENTS IN THE INNER COMA
First image (HY2004.gif) shows a visible picture of inner coma before (left) and after (right) elaboration. The second image (HY2004b.gif ) is an alaboration in wich almost five linear jets are visible toward the solar direction. Third image (HY2004c.gif) is a color rendition in wich both tail filaments and linear jets toward the solar direction are visible( resolution= 2,5"\pixel).
Observers : F.Manzini (S.A.S.), R.Crippa, C.Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (Novara), Italy
Date: April 20, 1996 19.30-20 T.U.

MOSAIC OF 7 CCD FRAMES
First image (HYMOSA1.gif) is a mosaic of about 3 of tail, without any elaboration . In the second image (HYMOSA2.gif) the elaboration shows a number of tail filaments. On the contrary, details of the nuclear region are evident in the third image. (HYMOSA3.gif)
Observers : F.Manzini (S.A.S.), R,Crippa, C.Guaita (G.A.T. Astronomical Center)
Location : SOZZAGO (Novara), Italy
Date: from March 21 to April 7, 1996

GLOBAL EVOLUTION OF THE INNER COMA
The variability and the intensity of the comet activity is evident in these 10 images (hysum.gif) taken along a 18 nights period. In particular, between March 21 and March 23, there is astonishing evidence of the outburst that produced release of many little fragments.


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