The Coma Morphology of Comet C/1996 B2 Hyakutake at Perigee

Details The Coma Morphology of Comet C/1996 B2 Hyakutake at Perigee The Coma Morphology of Comet C/1996 B2 Hyakutake at Perigee

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0910s&link_type=abstract

American Astronomical Society, DPS meeting #28, #09.10; Bulletin of the American Astronomical Society, Vol. 28, p.1090

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We report on the structural analysis of broad-band filter images of long-period comet C/1996 B2 Hyakutake taken during its perigee passage. Johnson BVR images (field of view 3.4mu^{\prime}1 x 4.4mu^{\prime}7, resolution 0.4mu^{\prime\prime}5 per pixel) were obtained with the 0.8-m telescope at Wendelstein Observatory, Germany, between March 8 and April 1, 1996. Several distinct features are present in the inner coma which are observed in high spatial resolution, since the comet had an angular resolution of 75 km/arcsec at the time of closest approach (Delta ~ 0.1 AU). The fragment that had split from the nucleus was also detected in our images from March 24, 1996. Furthermore, the coma exhibits clear spatial differences in color. The V-R images show a reddening in the sunward hemisphere. Since the broad-band images contain a mixture of the gas and the dust coma, this effect cannot be interpreted unambiguously. This reddening might either indicate the presence of larger dust particles in sunward direction or a greater abundance of gas in the tailward hemisphere. The morphological evolution of the coma and its color was investigated and we will present the first preliminary results.

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