Deep Impact

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Deep Impact
Deep Impact
04 July 2005 6 UT
July 4, 6 UT
Image from the Deep Impact spacecraft. http//deep
impact.jpl.nasa.gov/home/index.html
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IRTF observers
An observational campaign was conducted by C.
Lisse, N. Dello Russo (Johns Hopkins), D. Wooden
(NASA Ames), M. Kelley, C. Woodward (U. of
Minnesota), D. Harker (UC San Diego), Y.
Fernandez (U. of Central Florida). All data to
be made public after 6 months.
Weather Excellent!
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Moments after impact. Image from Deep Impact
spacecraft
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Lisse et al.IRTF/SpeXUsing prism
mode,R100.Observed temporal variation after
impact.
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Fernandez, Kelley et al.IRTF/SpeX

• J-band light curve at high time resolution.
  3 slopes apparent.
• Interpretation not settled yet.

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IRTF/SpeX Fernandez, Kelley et al. 3 color
light curve shows colors get bluer with time.
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Lisse, Dello Russo, et al.IRTF/SpeXthermal
spectrum.Searching for hydrocarbons, but no
spectral features seen.
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Wooden, Woodward, Harker et al.IRTF/HIFOGS
Time history of 10 micron flux density (upper
plot) HIFOGS spectrum (right plot) showing the
color temperature of the dust.
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Ruch, Woodward, Kelley, Harker, WoodenIRTF/MIRSI
Time history of 8.7-12.3 micron flux density.
Note the elevated N-band flux density on July 8.
This is a natural outburst of the comet.
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HIFOGS and MIRSI detect similar fluxes during
nominal activity. Dust emission rises on 29
Jun (burst) and afternoon after impact. The 10
micron data will be combined with other data to
model the dust temperature, composition, and
particle size.