Predicting The Rotational Phase Of 9P/Tempel 1 At The Stardust-NExT Encounter.

Details Predicting The Rotational Phase Of 9P/Tempel 1 At The Stardust-NExT Encounter. Predicting The Rotational Phase Of 9P/Tempel 1 At The Stardust-NExT Encounter.

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2832b&link_type=abstract

American Astronomical Society, DPS meeting #42, #28.32; Bulletin of the American Astronomical Society, Vol. 42, p.966

Astronomy and Astrophysics

Astronomy

Scientific paper

The scientific goals of the Stardust-NExT mission to comet 9P/Tempel 1 include imaging 25% of the area imaged by the Deep Impact mission at a resolution of at least 80 m/pixel looking for changes to the surface, imaging, at the highest possible resolution, of the artificial crater created during the Deep Impact encounter (349W, -26), and imaging coverage of a portion of the terrain not yet seen. Fulfilling these goals required detailed knowledge of the spin state of 9P's nucleus approximately one year ahead of the nominal time of encounter, Feb 14, 2011. Since the encounter occurs 33 days after perihelion passage it was necessary to develop a model of the acceleration of the comet's spin state through perihelion passage in order to make a prediction. Determination of the spin state to the required accuracy was achieved in January, 2010, and was accomplished using observations taken from the Hubble Space Telescope and from ground-based observatories. This information was then used as the basis of trajectory correction maneuver in Feb, 2010. We describe the independent development of two spin rate acceleration models based on 13 years of observations of the rate and phase of spin of the comet's nucleus through two perihelion passages obtained with the Hubble and Spitzer Space Telescopes, many ground-based telescopes within the organization of a International World-Wide campaign (Meech et al., 2005), and the Deep Impact mission. We present a visualization of the encounter that shows the anticipated coverage of the surface of 9P/Tempel 1 that should be attained and emphasizes the proportion of the surface previously seen with the Deep Impact cameras and the new terrain that will be covered.
Meech, K.J, and 210 coauthors. 2005. Deep Impact: Observations from a World-Wide Earth-based Campaign. Science 310, 265-269.

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