Diagnostic errors - no ephemeris for any of the visit Want to empirically adjust exposures to fill orbit visibility window - auto-adjust button is disabled in APT display Orbit Planner window ----- Submission 36 (Wed Apr 07 13:32:36 GMT 2004) ----- Phase II Proposal 10115 (T1Rotation) successfully submitted. ----- Submission 37 (Wed Apr 07 15:12:05 GMT 2004) ----- I don't know how to get APT to see an ephemeris. This apparently requires other software that is not a part of APT. We propose to accurately determine the rotational period of comet Tempel 1. This is crucial for enabling all of the science associated with the Deep Impact mission. It will also, in combination with ground-based data already on hand and images to be obtained from Deep Impact, provide the best dataset ever for investigating whether excited state rotation exists in any comet other than Halley.

In order to resolve ambiguities in the rotational period (22 vs. 42 hours) due to diurnal sampling, we require observations over a single rotational period (nominally 42 hours for the longer of the two ambiguous periods). This means that we must observe during an SAA-free window, which occurs roughly May 3 to May 9 of 2004. We require observations in every second orbit for the entire period and every orbit for one quarter of that period. The quarter of the period with every orbit used can occur anywhere in the full period, as long as it represents a continguous series of orbits, although here it is specified as the first 11 orbits. Assuming that the contiguous period is at the beginning of the program, this results in a series of 11 consecutive orbits, followed by alternating skipped orbits and orbits with observations, i.e. observations in orbits 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 21, 23, 25, for a total of 18 orbits. The observations in each orbit will be 3 exposures with ACS-HRC and the F606W filter. We would like to use the 3-point sub-pixel dither line, pattern 23, on STSI web page http://www.stsci.edu/hst/acs/proposing/dither/ACS-HRC-DITHER-LINE.html if this is supported in processing. The APT, however, appears to limit us to the 2-point dither that is standard as pattern #1. SOLAR SYSTEM 3 false false false false false SUPPORTED SOLAR SYSTEM Elements from JPL's Horizons System as last updated on 5 April 2004 Window button does not have an option for SAA-free window. 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