SWAS observations of comet 9P/Tempel 1 and Deep Impact

Details SWAS observations of comet 9P/Tempel 1 and Deep Impact SWAS observations of comet 9P/Tempel 1 and Deep Impact

2005-09-28

arxiv.org/abs/astro-ph/0509850v2

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of the IAU Symposium No. 231: "Astrochemistry - Recent Successes and Current Callenges". Typo cor

Scientific paper

10.1017/S1743921306007502

On 4 July 2005 at 1:52 UT the Deep Impact mission successfully completed its goal to hit the nucleus of 9P/Tempel 1 with an impactor, forming a crater on the nucleus and ejecting material into the coma of the comet. The 370 kg impactor collided with the sunlit side of the nucleus with a relative velocity of 10.2 km/s. NASA's Submillimeter Wave Astronomy Satellite (SWAS) observed the 1(10)-1(01) ortho-water ground-state rotational transition in comet 9P/Tempel 1 before, during, and after the impact. No excess emission from the impact was detected by SWAS. However, the water production rate of the comet showed large natural variations of more than a factor of three during the weeks before the impact.

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