a b s t r a c t- n a s a solar system exploration（a b s t r a n s a c t a solar system exploration）.doc

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a b s t r a c t- n a s a solar system exploration（a b s t r a n s a c t a solar system exploration）.doc

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AAS 03-026 Deep Impact Flyby Spacecraft Instrument Pointing in the Presence of an Inactive Impactor Spacecraft Daniel G. Kubitschek, Nick Mastrodemos, and Stephen P. Synnott Jet Propulsion Laboratory California Institute of Technology 26th ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE February 5-9, 2003 Sponsored by Breckenridge, Colorado Rocky Mountain Section AAS Publications Office, P.O. Box 28130 - San Diego, California 92198 AAS 03-026 DEEP IMPACT FLYBY SPACECRAFT INSTRUMENT POINTING IN THE PRESENCE OF AN INACTIVE IMPACTOR SPACECRAFT Daniel G. Kubitschek, Nick Mastrodemos, and Stephen P. Synnott Jet Propulsion Laboratory California Institute of Technology The engineering goal of the Deep Impact mission is to impact comet Tempel 1 on July 4, 2005, with a 350 kg active Impactor spacecraft (s/c). The relative velocity will be just over 10 km/s. The impact is expected to excavate a crater of approximately 20 m deep and 100 m wide. The science objective is that of exposing the interior material and understanding the properties of the nucleus. In order to achieve the engineering goal and science objective, Deep Impact will use the autonomous optical navigation (AutoNav) software system to guide the Impactor s/c to Tempel 1 intercept near the center of brightness (CB), while a second s/c, the Flyby s/c, uses identical software to determine its comet-relative trajectory providing the attitude determination and control system (ADCS) with the relative position information necessary to point the High Resolution Instrument (HRI) and Medium Resolution Instrument (MRI) at the expected impact site during encounter. If the Impactor s/c is determined to be functioning improperly prior to release, the issue of predicting the impact location to correctly point the instruments at key science epochs (TOI: Time of Impact; and TOFI: Time of Final Imaging), becomes important and therefore must be studied. This relies, fundamentally, on the a