Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-31
Astronomy and Astrophysics
Astrophysics
11 pages, 4 postscript figures. Accepted for publication in Icarus special issue on Deep Impact
Scientific paper
10.1016/j.icarus.2006.08.032
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-sigma) level following the impact. We derive a quiescent water production rate of 9 x 10^27 molecules per second with an estimated uncertainty of 30%. Our upper limits to the volatiles produced by the impact are consistent with other estimates.
A'Hearn Michael F.
Alan Stern S.
Bertaux Jean Loup
Feldman Paul D.
Festou Michel C.
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