A CCD IMAGE ARCHIVE OF COMET C/1995 O1 (HALE–BOPP): DUST EXPANSION VELOCITIES


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Abstract

An optical archive of comet Hale–Bopp was obtained over 28 nights from June 1996 to May 1997 covering a range of heliocentric distances of r = 4.12 - 0.91. The CCD images were obtained with the 0.8-m University of Washington Manastash Ridge Observatory and the 0.25-m Pennsylvania State University at Erie mobile observatory. The reduced images clearly document the evolution of features of the coma, which were dominated by radial jets from r = 4.1 - 2.3 AU, curved fan-shaped jets from r = 1.2 - 1.0 AU, and arcs or shells for 0.9 < r < 1.0 AU. We present the images and derive an average dust expansion velocity of Vdust= 0.67 ± 0.07 km s-1from measurements of the arc features. The images in the archive will be made available to other researchers for further study.

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