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Dust observations of Comet 9P/Tempel 1 at the time of the Deep Impact | | G.P. Tozzi
; H. Boehnhardt
; L. Kolokolova
; T. Bonev
; E. Pompei
; S. Bagnulo
; N. Ageorges
; L. Barrera
; O. Hainaut
; H.U. Kaeufl
; F. Kerber
; G. LoCurto
; O. Marco
; E. Pantin
; H. Rauer
; I. Saviane
; C. Sterken
; M. Weiler
; | | Date: |
4 Oct 2007 | | Abstract: | On 4 July 2005 at 05:52 UT, the impactor of NASA’s Deep Impact (DI) mission
crashed into comet 9P/Tempel 1 with a velocity of about 10 km/s. The material
ejected by the impact expanded into the normal coma, produced by ordinary
cometary activity.
The characteristics of the non-impact coma and cloud produced by the impact
were studied by observations in the visible wavelengths and in the near-IR. The
scattering characteristics of the "normal" coma of solid particles were studied
by comparing images in various spectral regions, from the UV to the near-IR.
For the non-impact coma, a proxy of the dust production has been measured in
various spectral regions. The presence of sublimating grains has been detected.
Their lifetime was found to be about 11 hours. Regarding the cloud produced by
the impact, the total geometric cross section multiplied by the albedo was
measured as a function of the color and time. The projected velocity appeared
to obey a Gaussian distribution with the average velocity of the order of 115
m/s. By comparing the observations taken about 3 hours after the impact, we
have found a strong decrease in the cross section in J filter, while that in Ks
remained almost constant. This is interpreted as the result of sublimation of
grains dominated by particles of sizes of the order of some microns. | | Source: | arXiv, 0710.1040 | | Services: | Forum | Review | PDF | Favorites | |
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