GALEX Observations of Comet 9P/Tempel 1 During Deep Impact

Details GALEX Observations of Comet 9P/Tempel 1 During Deep Impact GALEX Observations of Comet 9P/Tempel 1 During Deep Impact

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2514m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #25.14; Bulletin of the American Astronomical Society, V

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GALEX observations of comet 9P/Tempel 1 using the near ultraviolet (NUV) objective grism were made before, during and after the Deep Impact Event that occurred on 4 July 2005 at 05:52 UT. The NUV channel provides usable spectral information in a bandpass covering 2200 -3200 Å with a point source spectral resolution of R 100. The primary spectral features in this range include a solar continuum scattered from cometary dust and emissions from OH and CS molecular bands near 3090 and 2575 Å. In particular, the CS emission is unique to this bandpass. The observations allow the evolution of these spectral features to be tracked over the encounter. We will discuss our procedure for extending the GALEX absolute calibration to the wavelength region longward of 3000 Å where the modest ``red leak'' in the Cs2Te photochathode is nevertheless high enough to provide good detection efficiency for OH emission. In general, the NUV emissions observed from Tempel 1 throughout the encounter are much lower than those observed by GALEX from comet C/2004 Q2 Machholtz (Morgenthaler et al. DPS 2005). Production rates for the dust and molecules detected by GALEX in Tempel 1 will be derived and compared to other observations.

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