Hale-Bopp image March 9th Hale-Bopp image March 31st Hale-Bopp image April 17th
Hale-Bopp on March 9th 18:07, March 31st 19:11 and April 17th 19:13 UT in Johnson V, 1 sec exposure taken on the OLT. A highpass filter was applied to these images to reduce the strong radial gradient in the light distribution.

From March to May 1997, Oliver Czoske, Lubos Kohoutek and myself used the 1.23m Oskar-Lühning Telescope of the Hamburg Observatory equipped with a small CCD camera to monitor comet C/1995 O1 Hale-Bopp. In about 20 clear nights, we obtained a total of 600 images in Johnson BVRI bands. Despite the bad seeing most of the time, the structures of evolving and rotating spiral arms and shells around the nucleus, caused by rotating jets, are clearly visible on our images.
Unfortunately, I don't have the time to carry out a deep analysis of our data. I started doing this by simulating the evolution of the dust shells numerically but then went back to gravitational lenses which are the main subject of my work. Preliminary results of this work and some effort of Hanns Selig are the direction of the rotation axis and the rotation period. Both values are not far away from values in the literature but show interesting deviations.
If you are interested in analyzing the data more deeply, please send me a note. It should be possible to determine the cometographic positions of the active regions of Hale-Bopp, the ejection velocities and the influence of the solar wind and radiation pressure on the evolution of the dust jets.

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This document last modified Wed Aug 15 14:53:35 CEST 2007