Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33a1758h&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P33A-1758
Physics
[6000] Planetary Sciences: Comets And Small Bodies, [6008] Planetary Sciences: Comets And Small Bodies / Composition, [6040] Planetary Sciences: Comets And Small Bodies / Origin And Evolution
Scientific paper
We report the preliminary results of a campaign to study long period comet C/2009P1 (Garradd) with a tunable spatial heterodyne spectrometer (TSHS) that has been installed semi-permanently at Mt. Hamilton. We address the challenges in cometary observations (low velocity flows, faint angularly extended emissions, and temporally variability) through the use of TSHS, an interferometric technique that combines very high spectral resolving power (R=λ/dλ~105) with a wide FOV. These characteristics allow successful use of TSHS at small aperture telescopes where greater amounts of observing time can be committed. Comet Garradd is well suited for synoptic study (starting summer 2011), because its exceptional orbital phasing pattern allows observations over a heliocentric distance that cross the ice sublimation line (~2.5AU) on both inbound and outbound parts of its orbit. Unfortunately its large geocentric distance during most of this time means that it will be faint (m>7) and require high sensitivity instruments to monitor its effectively. The TSHS can be aligned to bright bands from several different molecular radicals in the coma, particularly C2, C3, NH2, OI, and CN. Our goal is to follow the evolution of the production rate ratios of these species as Garradd transitions from large heliocentric distances (~3AU), through the inner solar system, and then back to 3AU.
Harris William
Hosseini Shahram
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