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The High Resolution Instrument Infrared Spectrometer (HRI-IR) onboard theDeep Impact Flyby spacecraft detected H2O, CO2, and CO in the coma of thedynamically young Oort cloud comet C/2009 P1 (Garradd) post-perihelion at aheliocentric distance of 2 AU. Production rates were derived for the parentvolatiles, QH2O = 4.6e28, QCO2 = 3.9e27, and QCO = 2.9e28 molecules s-1, andare consistent with the trends seen by other observers and within the errorbars of measurements acquired during a similar time period. When compiled withother observations of the dominant volatiles of Garradd, unexpected behaviorwas seen in the release of CO. The H2O outgassing of Garradd, increasing andpeaking pre-perihelion and then steadily decreasing, is more typical than thatof CO, which monotonically increased throughout the entire apparition. Due tothe temporal asymmetry in volatile release, Garradd exhibited the highest CO toH2O abundance ratio ever observed for any comet inside the water snow line at60 percent during the HRI-IR observations. Also, the HRI-IR made the onlydirect measurement of CO2, giving a typical cometary abundance ratio of CO2 toH2O of 8 percent but, with only one measurement, no sense of how it varied withorbital position.

Uncorrelated Volatile Behavior During the 2011 Apparition of Comet C/2009 P1 Garradd