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Placing the Deep Impact Mission into Context: Two Decades of Observations of 9P/Tempel 1 from McDonald Observatory | Anita L. Cochran
; Edwin S. Barker
; Marcos D. Caballero
; Judit Gyorgey-Ries
; | Date: |
2 Sep 2008 | Abstract: | We report on low-spectral resolution observations of comet 9P/Tempel 1 from
1983, 1989, 1994 and 2005 using the 2.7m Harlan J. Smith telescope of McDonald
Observatory. This comet was the target of NASA’s Deep Impact mission and our
observations allowed us to characterize the comet prior to the impact. We found
that the comet showed a decrease in gas production from 1983 to 2005, with the
the decrease being different factors for different species. OH decreased by a
factor 2.7, NH by 1.7, CN by 1.6, C$_{3}$ by 1.8, CH by 1.4 and C$_{2}$ by 1.3.
Despite the decrease in overall gas production and these slightly different
decrease factors, we find that the gas production rates of OH, NH, C$_{3}$, CH
and C$_{2}$ ratioed to that of CN were constant over all of the apparitions. We
saw no change in the production rate ratios after the impact. We found that the
peak gas production occurred about two months prior to perihelion. Comet Tempel
1 is a "normal" comet. | Source: | arXiv, 0809.0479 | Services: | Forum | Review | PDF | Favorites |
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