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Ultraviolet spectroscopy of Comet 9P/Tempel 1 with Alice/Rosetta during the Deep Impact encounter |
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| Authors: | Paul D Feldman S Alan Stern Joel Wm Parker Michael F A'Hearn Michel C Festou |
| Institution: | a Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Streets, Baltimore, MD 21218-2695, USA b Space Science & Engineering Division, Southwest Research Institute, 1050 Walnut Street, Suite 400, Boulder, CO 80302, USA c Space Science & Engineering Division, Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238, USA d Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA e Service d'Aéronomie du CNRS, BP 3, F-91371 Verrières-le-Buisson, France f Observatoire Midi-Pyrénées, 14, avenue E. Belin, F-31400 Toulouse, France |
| Abstract: | We report on spectroscopic observations of periodic Comet 9P/Tempel 1 by the Alice ultraviolet spectrograph on the Rosetta spacecraft in conjunction with NASA's Deep Impact mission. Our objectives were to measure an increase in atomic and molecular emissions produced by the excavation of volatile sub-surface material. We unambiguously detected atomic oxygen emission from the quiescent coma but no enhancement at the 10% (1-σ) level following the impact. We derive a quiescent H2O production rate of 9×1027 molecules s−1 with an estimated uncertainty of ∼30%. Our upper limits to the volatiles produced by the impact are consistent with other estimates. |
| Keywords: | Comet Tempel 1 Ultraviolet observations |
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