The Carbon Monoxide Abundance in Comet 103P/Hartley

Details The Carbon Monoxide Abundance in Comet 103P/Hartley The Carbon Monoxide Abundance in Comet 103P/Hartley

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1057w&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1057

Physics

Scientific paper

We report the detection of several emission bands in the CO Fourth Positive Group (4PG) from comet 103P/Hartley during ultraviolet spectroscopic observations from the Hubble Space Telescope (HST). Our team was allocated a total of 15 orbits of HST time to observe 103P during the fall of 2010, which we divided into three 5-orbit observing runs: on September 25 (r = 1.15 AU, = 0.22 AU), on November 4 (r = 1.06 AU, = 0.16 AU; EPOXI closest approach was on Nov 4.5832 UT), and on November 28 (r = 1.14 AU, = 0.28 AU). On the latter two dates we detected CO 4PG emission near 1500 Å using the Cosmic Origins Spectrograph (COS) with the G160M grating (Figure 1). The CO emissions exhibited short-term temporal variability at the level of 30%, apparently in phase with the rotation of the comet's nucleus. For the spectra taken at the time of the EPOXI flyby, we derived a CO/H2O ratio of 0.15-0.45% [3]. Our preliminary analysis gives a similar CO abundance on November 28; the final estimates will be presented at the meeting.

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