The Ambient Coma of Comet 9P/Tempel 1 as observed by the Deep Impact Flyby Spacecraft

Details The Ambient Coma of Comet 9P/Tempel 1 as observed by the Deep Impact Flyby Spacecraft The Ambient Coma of Comet 9P/Tempel 1 as observed by the Deep Impact Flyby Spacecraft

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p32a..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P32A-03

Physics

6008 Composition (1060), 6015 Dust, 6045 Physics And Chemistry Of Materials, 6210 Comets (6023)

Scientific paper

Color images from both HRI and MRI on the Deep Impact spacecraft produce images of the coma and nucleus before and after impact between 309 and 950 nm. The distribution of gas and dust is measured at pixel scales of 25 m and S/N greater than 3. Filters are designed to measure OH (309 nm), CN (387 nm), and C2(514 nm) as well as dust continuum at 345 and 526 nm, a clear filter at 650 nm, and broadband, context filters at 750 and 950 nm. The HRI has broadband filters between 350 and 950 nm with 100 nm band passes. These are designed for nucleus color measurements. A sequence of long exposure color images were acquired 5 hours before impact, when the spatial resolution was between 2200 and 1940 km/pixel. Another sequence was acquired 1 minute before impact. We look for relationships between gas and dust (coupling and decoupling) and their distributions with respect to the nucleus that reveal evidence of preferential outgassing. There is enhancement of gas and dust in the sunward direction, toward the south and at discrete, smaller areas at the north, which are not as prominent as the southward fan. The broadband visible spectrum of the nucleus shows no evidence of broad absorption features at the resolution of the filters (100 nm). Relative I/F increases with increasing wavelength by 12 percent over the observed spectral range (309-950 nm). The color of the nucleus is converted to B,V and R colors and compared to other short period comets. B-V=0.79 +/-0.04 and V- R=0.47+/-0.07, making it within the range of other Jupiter Family Comets with respect to nucleus color.

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