Ir Observations Of An Outburst In Comet Hale-Bopp (C/1995 O1) |
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| Authors: | Tozzi Gian Paolo Mannucci Filippo Stanga Ruggero |
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| Institution: | (1) Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy;(2) Centro per l‘Astronomia Infrarossa e lo Studio del Mezzo Interstellare del C.N.R., Italy;(3) Dipartimento di Astronomia e Scienza dello Spazio dell‘Universití di Firenze, Italy |
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| Abstract: | The comet Hale-Bopp (C/1995 O1) has been observed in the infrared (1–2.5 μm) with the Nordic Optical Telescope (NOT) equipped
with the Arcetri NICMOS3 camera (ARNICA). Two observational campaigns, each one lasting about one week, were made when the
comet heliocentric distance was about 3 AU. The first campaign was at the end of August and the second at the end of September
1996.
During both runs two major outbursts were observed, the more intense of them started the day before the beginning of the second
run. In the images recorded during the first three nights (24.8–26.8 Sept.) of the second run a dust shell expanding in the
northern quadrant with a projected velocity of 0.14–0.28 km/s is clearly evident. The dust production rate increased by at
least a factor ≈3 at the time of the outburst. Also evident on the first night is a change in the IR color that is well correlated
with the dust shell. This is an indication that the material released by the outburst has a different composition and/or size
distribution than that in the “quiescent” dust coma.
In this paper we present preliminary results about the evolution and the photometric characteristics of the dust shell.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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