NICMOS/HST Post-Perihelion Images of Comet Hale-Bopp in Outburst |
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| Authors: | McCARTHY D STOLOVY S KERN S SCHNEIDER G FERRO A SPINRAD H BLACK J SMITH B |
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| Institution: | (1) Steward Observatory, The University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA;(2) University of California, Berkeley, USA;(3) OSO, Sweden;(4) University of Hawaii, USA |
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| Abstract: | 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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