NICMOS/HST Post-Perihelion Images of Comet Hale-Bopp in Outburst

Details NICMOS/HST Post-Perihelion Images of Comet Hale-Bopp in Outburst NICMOS/HST Post-Perihelion Images of Comet Hale-Bopp in Outburst

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...78..243m&link_type=abstract

Earth, Moon, and Planets, v. 78, Issue 1/3, p. 243-249 (1997).

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Scientific paper

Near-infrared images of comet Hale-Bopp (C/1995 O1) were obtained from NICMOS/HST on UT August 27 28, 1997, when the comet emerged from the 50 degree solar elongation limit at 2.99 AU from Earth. Diffraction-limited images were obtained with camera 2 filters centered at 1.87, 1.90, 2.04 and 2.22 μm with ˜0.2″ resolution (0.076″/pixel; 165 km/pixel). Over the 1.7-hour baseline of observation, a recent (<7 hours) outburst is seen in the form of an expanding spiral arm with a projected expansion velocity of ˜80 m/s. Other asymmetric features include a jet emanating from the nucleus and several static linear features. Comparisons of the flux distribution in the 2.04 and 2.22 μm filters indicate that the region near the nucleus exhibits a slight, ˜3%, water ice absorption.

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