It would appear the situation has changed since 11-10 and my 11-10 based 3D construction. The tail light spot trailing the comet may now be showing a position angle off to one side of the medial center line of the comet. Amateur images published on the web through 11-11 were showing the disconnected tail about 34-35' behind the center of the coma, but at a line directly trailing the medial line of the coma and central condensation. A great triptych by John Wunderlin posted on Cloudy Nights and Spaceweather.com illustrates the situation on 11-10. http://spaceweather.com/comets/holmes/10nov07/John-Wunderlin1.jpg Based on the assumption that the position angle of the dust light spot trailing the comet on 11-10 was nearly on the sun-comet line, I prepared the 3D construction above. This assumption was questionable, because comet dust tails typically curve away from the comet, e.g as seen in comets McNaught in 2007 and Hale-Bopp in 1997 - http://en.wikipedia.org/wiki/Image:Comet_P1_McNaught02_-_23-01-07.jpg http://en.wikipedia.org/wiki/Image:Comet_Hale-Bopp.jpg An early 10-26 image and report by the professional astronomer Dr. Pierre Bastien of the Universite de Montreal suggested the then nascent tail may have been at an angle. See - http://www.spaceref.com/news/viewpr.html?pid=23901 As the tail grew, the did not appear to be any deviation in position angle of the tail relative the medial line of the comet, as shown in the amateur images above. But the 11-15 wide-field image posted on Cloudy Nights by "Hiro" may show a changed geometry. http://farm3.static.flickr.com/2100/2040106475_4557f789e6.jpg The light spot trailing the comet - now about 60' behind the comet - in "Hiro"'s 11-15 image appears to be slightly off-center from the medial line of the comet. This would be consistent with a far end of the disconnected tail drifting into a curved shape. Subsequent images may clarify if there is a trend. - Kurt _______________________________________________ Sent via CSolutions - http://www.csolutions.net