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<HSTProposal
   Phase1ID="10860"
   Phase2ID="10860"
   Phase="Phase II"
   AptVersion="Version 16.0.3 ">
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   <!--This file is automatically generated and should not be edited by hand. Editing this file directly is at your own risk.-->
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   <ToolData>
      
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         Key="Phase2SubmissionData">
         
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            AptVersion="Version 16.0.3 "
            SubmissionCounter="4"
            SubmissionSuccessCounter="3"
            HasErrors="false"
            Cycle="15"
            IncludeSysInfo="true"
            NotificationAddress="mbrown@caltech.edu"
            AssignedID="10860">
            
            <SystemInformation
               os.arch="x86"
               os.name="Windows XP"
               os.version="5.1"
               java.version="1.5.0_08"
               linux.distribution="not available"
               linux.version="not available" />
            
            <SubmissionComments>Visit 4 changed from ACS --&gt; WFPC2</SubmissionComments>
            
            <SubmissionLog>----- Attempting Submission 4 (Wed Feb 28 21:19:10 GMT 2007) -----
</SubmissionLog>
            
            <Phase2DiagnosticJustification />
         </Phase2SubmissionData>
      </ToolDataItem>
   </ToolData>
   
   <ProposalInformation
      Category="GO"
      PureParallelProposal="false"
      Cycle="15"
      STScIEditNumber="2">
      
      <Title>The largest Kuiper belt objects</Title>
      
      <Abstract>The past year has seen an explosion in the discoveries of Pluto-sized objects in the Kuiper belt. With the discoveries of the methane-covered 2003 UB313 and 2005 FY9, the multiple satellite system of 2003 EL61, and the Pluto-Charon analog system of Orcus and its satellite, it is finally apparent that Pluto is not a unique oddball at the edge of the solar system, but rather one of a family of similarly large objects in the Kuiper belt and beyond. HST observations over the past decade have been critical for understanding the interior, surface, and atmosphere of Pluto and Charon. We propose here a comprehensive series of observations designed to similarly expand our knowledge of these recently discovered Pluto-sized and near-Pluto-sized Kuiper belt objects. These observations will measure objects' sizes and densities, explore the outcome of collisions in the outer solar system, and allow the first ever look at the interior structure of a Kuiper belt object.

Our wide field survey that discovered all of these objects is nearly finished, so after five years of continuous searching we are finally almost complete in our tally of these near-Pluto-sized objects. This large HST request is the culmination of this half-decade search for new planetary-sized objects. As has been demonstrated repeatedly by the approximately 100 previous orbits devoted to the study of Pluto, only HST has the resolution and sensitivity for detailed study of these distant objects. With these new Pluto-sized objects only now being discovered we have a limited window left to still use HST for these critical observations.</Abstract>
      
      <PrincipalInvestigator
         Honorific="Dr."
         FirstName="Michael"
         MiddleInitial="E."
         LastName="Brown"
         ESAMember="false"
         UniqueID="7804"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="California Institute of Technology"
            USState="CA"
            Country="USA" />
      </PrincipalInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Henry"
         MiddleInitial="G."
         LastName="Roe"
         ESAMember="false"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="California Institute of Technology"
            USState="CA"
            Country="USA" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Ms."
         FirstName="Kristine"
         LastName="Barkume"
         ESAMember="false"
         UniqueID="7806"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="California Institute of Technology"
            USState="CA"
            Country="USA" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Ms."
         FirstName="Emily"
         MiddleInitial="L."
         LastName="Schaller"
         ESAMember="false"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="California Institute of Technology"
            USState="CA"
            Country="USA" />
      </CoInvestigator>
      
      <Questions>
         
         <Phase2Questions>
            
            <ObservingDescription>This proposal consists of 3 separate types of observations. 
1) Deep imaging tracking a moving target
2) Imaging of a moving target timed for when a nearby star is in the field for PSF calibration 
3) Imaging at a cadence designed to measure the orbit of a satellite</ObservingDescription>
            
            <RealtimeJustification />
            
            <CalibrationJustification />
            
            <AdditionalComments />
         </Phase2Questions>
      </Questions>
      
      <Orbits
         ThisCycle2GyroPrimary="27"
         ThisCycle2GyroParallel="0"
         NextCycle2GyroPrimary="0"
         NextCycle2GyroParallel="0"
         AfterNext2GyroPrimary="0"
         AfterNext2GyroParallel="0" />
      
      <Phase1ProposalInformation
         TotalTargets="1"
         Attachment="C:\Applications\APT1603\Z:\hst\cyc15\largekbos.pdf">
         
         <ScientificCategory>SOLAR SYSTEM</ScientificCategory>
         
         <ScientificKeyword1
            Keyword="DYNAMICS" />
         
         <ScientificKeyword2
            Keyword="KUIPER BELT OBJECTS" />
         
         <ScientificKeyword3
            Keyword="PLANETARY SATELLITES" />
         
         <ScientificKeyword4
            Keyword="SURFACES OF PLANETS/MOONS/OTHER" />
         
         <ProprietaryPeriod>12</ProprietaryPeriod>
         
         <CalibProp>false</CalibProp>
         
         <SpitzerHours>3.6</SpitzerHours>
         
         <Treasury>false</Treasury>
         
         <Legacy>false</Legacy>
         
         <Theory>false</Theory>
         
         <LargeProgram>false</LargeProgram>
         
         <Spitzer>false</Spitzer>
         
         <Survey>false</Survey>
      </Phase1ProposalInformation>
      
      <Phase2ProposalInformation
         PCFlag="true">
         
         <Availability>SUPPORTED</Availability>
      </Phase2ProposalInformation>
   </ProposalInformation>
   
   <Targets>
      
      <FixedTarget
         Name="2003EL61-APPULSE-STAR"
         Number="8"
         ReferenceFrame="ICRS">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription>
            
            <Description>OTHER</Description>
         </PrimaryDescription>
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="17.7" />
         </Fluxes>
         
         <AlternateNames />
         
         <EquatorialPosition>
            
            <RA
               Hrs="13"
               Mins="35"
               Secs="49.1400" />
            
            <RAUnc
               Arcsec="0.1" />
            
            <DEC
               Degrees="+19"
               Arcmin="24"
               Arcsec="29.10" />
            
            <DECUnc
               Arcsec="0.1" />
            
            <Equinox>J2000</Equinox>
         </EquatorialPosition>
         
         <ProvisionalRA>00 00 0.0000</ProvisionalRA>
         
         <ProvisionalDEC>+00 00 0.00</ProvisionalDEC>
         
         <Equinox>J2000</Equinox>
      </FixedTarget>
      
      <SolarSystemTarget
         Name="2003UB313"
         Number="2">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="18.8" />
         </Fluxes>
         
         <Keyword>PLANET</Keyword>
         
         <Description>the 10th planet</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=67.76360306013858,E=0.44092853463481,I=44.02855930264354,O=35.95886882418944,W=150.8967797282232,M=196.9607112216522,EQUINOX=J2000,EPOCH=08-JUL-2003:00:00:00</Text>
            
            <Asteroid
               A="67.76360306013858"
               E="0.44092853463481"
               I="44.02855930264354"
               O="35.95886882418944"
               W="150.8967797282232"
               M="196.9607112216522"
               Equinox="J2000">
               
               <Epoch
                  Year="2003"
                  Month="7"
                  Day="8"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
         </Level1>
         
         <Windows>
            
            <Text />
         </Windows>
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      <SolarSystemTarget
         Name="2005FY9"
         Number="3">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="17.1" />
         </Fluxes>
         
         <Keyword>OTHER</Keyword>
         
         <Description>Kuiper belt object</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=45.7771453911578,E=0.15445043088848,I=28.99981620003449,O=79.4417973945687,W=297.3048477992733,M=144.436753316043,EQUINOX=J2000,EPOCH=01-OCT-2004:00:00:00</Text>
            
            <Asteroid
               A="45.7771453911578"
               E="0.15445043088848"
               I="28.99981620003449"
               O="79.4417973945687"
               W="297.3048477992733"
               M="144.436753316043"
               Equinox="J2000">
               
               <Epoch
                  Year="2004"
                  Month="10"
                  Day="1"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
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         <Windows>
            
            <Text />
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      <SolarSystemTarget
         Name="ORCUS"
         Number="4">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="19.1" />
         </Fluxes>
         
         <Keyword>OTHER</Keyword>
         
         <Description>Kuiper belt object with satellite</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=39.38740163192196,E=0.2220077213704,I=20.52293087659058,O=268.3917534413838,W=74.10645482450718,M=151.7437869109494,EQUINOX=J2000,EPOCH=02-MAY-2001:00:00:00</Text>
            
            <Asteroid
               A="39.38740163192196"
               E="0.2220077213704"
               I="20.52293087659058"
               O="268.3917534413838"
               W="74.10645482450718"
               M="151.7437869109494"
               Equinox="J2000">
               
               <Epoch
                  Year="2001"
                  Month="5"
                  Day="2"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
         </Level1>
         
         <Windows>
            
            <Text />
         </Windows>
      </SolarSystemTarget>
      
      <SolarSystemTarget
         Name="QUAOAR"
         Number="5">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="19.3" />
         </Fluxes>
         
         <Keyword>OTHER</Keyword>
         
         <Description>Kuiper belt object</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=43.08621361645555,E=0.03843976559958,I=8.00196274167621,O=189.0420018539052,W=165.7532947806834,M=258.0120356902188,EQUINOX=J2000,EPOCH=25-NOV-2000:00:00:00</Text>
            
            <Asteroid
               A="43.08621361645555"
               E="0.03843976559958"
               I="8.00196274167621"
               O="189.0420018539052"
               W="165.7532947806834"
               M="258.0120356902188"
               Equinox="J2000">
               
               <Epoch
                  Year="2000"
                  Month="11"
                  Day="25"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
         </Level1>
         
         <Windows>
            
            <Text />
         </Windows>
      </SolarSystemTarget>
      
      <SolarSystemTarget
         Name="SEDNA"
         Number="6">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="21.2" />
         </Fluxes>
         
         <Keyword>OTHER</Keyword>
         
         <Description>Kuiper belt obkect</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=523.2867256717789,E=0.85466693045799,I=11.93235787319574,O=144.5746569848294,W=311.306523735294,M=357.8230144149302,EQUINOX=J2000,EPOCH=12-NOV-2003:00:00:00</Text>
            
            <Asteroid
               A="523.2867256717789"
               E="0.85466693045799"
               I="11.93235787319574"
               O="144.5746569848294"
               W="311.306523735294"
               M="357.8230144149302"
               Equinox="J2000">
               
               <Epoch
                  Year="2003"
                  Month="11"
                  Day="12"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
         </Level1>
         
         <Windows>
            
            <Text />
         </Windows>
      </SolarSystemTarget>
      
      <SolarSystemTarget
         Name="2002UX25"
         Number="7">
         
         <PrimaryCategory>SOLAR SYSTEM</PrimaryCategory>
         
         <PrimaryDescription />
         
         <Comments />
         
         <Fluxes>
            
            <BroadBandMagnitude
               Band="V"
               Magnitude="20" />
         </Fluxes>
         
         <Keyword>OTHER</Keyword>
         
         <Description>Kuiper belt object</Description>
         
         <Level1>
            
            <Text>TYPE=ASTEROID,A=42.82040420101688,E=0.14494307018068,I=19.41838647612862,O=204.6357799449855,W=276.2811994322195,M=279.0858312037766,EQUINOX=J2000,EPOCH=10-JUN-2002:00:00:00</Text>
            
            <Asteroid
               A="42.82040420101688"
               E="0.14494307018068"
               I="19.41838647612862"
               O="204.6357799449855"
               W="276.2811994322195"
               M="279.0858312037766"
               Equinox="J2000">
               
               <Epoch
                  Year="2002"
                  Month="6"
                  Day="10"
                  Hrs="0"
                  Mins="0"
                  Secs="0" />
            </Asteroid>
         </Level1>
         
         <Windows>
            
            <Text />
         </Windows>
      </SolarSystemTarget>
   </Targets>
   
   <Observations>
      
      <Observation
         TargetName="2003EL61-- APPULSE STAR"
         Instrument="ACS"
         Number="1"
         NumberOfOrbits="5"
         NumberOfIterations="1"
         TotalOrbits="5"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="false">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F435W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="false"
            SameOrient="false">
            
            <Between>
               
               <Start
                  Year="2007"
                  Month="1"
                  Day="4"
                  Hrs="7"
                  Mins="0"
                  Secs="0" />
               
               <End
                  Year="2007"
                  Month="1"
                  Day="4"
                  Hrs="13"
                  Mins="0"
                  Secs="0" />
            </Between>
         </ObservationRequirements>
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="BETWEEN 04-JAN-2007:07:00:00 AND 04-JAN-2007:13:00:00;" />
      </Observation>
      
      <Observation
         TargetName="2003UB313"
         Instrument="ACS"
         Number="2"
         NumberOfOrbits="2"
         NumberOfIterations="1"
         TotalOrbits="2"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="2005FY9"
         Instrument="ACS"
         Number="3"
         NumberOfOrbits="2"
         NumberOfIterations="1"
         TotalOrbits="2"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="QUAOAR"
         Instrument="ACS"
         Number="4"
         NumberOfOrbits="2"
         NumberOfIterations="1"
         TotalOrbits="2"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="SEDNA"
         Instrument="ACS"
         Number="5"
         NumberOfOrbits="2"
         NumberOfIterations="1"
         TotalOrbits="2"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="ORCUS"
         Instrument="ACS"
         Number="6"
         NumberOfOrbits="1"
         NumberOfIterations="1"
         TotalOrbits="1"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="ORCUS"
         Instrument="ACS"
         Number="7"
         NumberOfOrbits="1"
         NumberOfIterations="1"
         TotalOrbits="1"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="false"
            SameOrient="false">
            
            <AfterObservation
               Observation="6">
               
               <From
                  Days="2.0" />
               
               <To
                  Days="3.0" />
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         </ObservationRequirements>
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="AFTER  6 BY 2D TO 3D" />
      </Observation>
      
      <Observation
         TargetName="ORCUS"
         Instrument="ACS"
         Number="8"
         NumberOfOrbits="1"
         NumberOfIterations="1"
         TotalOrbits="1"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="false"
            SameOrient="false">
            
            <AfterObservation
               Observation="7">
               
               <From
                  Days="6.0" />
               
               <To
                  Days="9.0" />
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         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="AFTER  7 BY 6D TO 9D" />
      </Observation>
      
      <Observation
         TargetName="ORCUS"
         Instrument="ACS"
         Number="9"
         NumberOfOrbits="1"
         NumberOfIterations="1"
         TotalOrbits="1"
         PureParallel="false"
         CoordinatedParallel="false"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="true">
         
         <Configurations>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="false"
            SameOrient="false">
            
            <AfterObservation
               Observation="8">
               
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      <Observation
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            <Configuration>
               
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            <Configuration>
               
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      <Observation
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            <Configuration>
               
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      <Pattern>
         
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         <Comments>The goal of this visit is to observe the large KBO 2003 EL61 over a full rotation to create a shape model. Five sequential orbits are required. The observations must be obtained while 2003 EL61 is near a field star which can be used for PSF calibration.

The timing requirements refer to the time during which the star is visible in the HRC field so the entire sequence of 5 orbits needs to happen during this time!

This appulse star is the second most favorable, but there are alternatives if this scheduling is impossible, as it was for the most favorable star.</Comments>
         
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                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="2"
                     SplitNumber="1"
                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="2"
                     SplitNumber="2"
                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="1"
                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="2"
                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="2" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="2" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
         Number="06"
         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
                  <Value>C:\Documents and Settings\mbrown\Local Settings\Temp\OPVisit45760.xml</Value>
               </OpToolDataString>
            </ToolDataItem>
            
            <ToolDataItem
               Key="OpTimeStamp">
               
               <OpToolDataDate>
                  
                  <Time>1172694601827</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical

1st epoch</Comments>
         
         <TicData>
            
            <TicFileString>
(Tic-Visit
 :proposal-id 10860
 :visit-id "06"
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(Tic-Obset
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 :obset-id "06"
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(Tic-Orbit
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 :pcs-time 355
 :si-vis-utilization 2772
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 :pcs-visibility 3132
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</TicFileString>
            
            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
            Type="Pattern"
            Pattern="1">
            
            <Exposure
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               TargetName="ORCUS"
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               Opmode="ACCUM"
               Aperture="HRC"
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               NumberOfIterations="1"
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               RequiresUplink="false"
               Expand="false"
               LowSky="false"
               Shadow="false"
               NewAlignment="false"
               NewObset="false"
               NewObsetFullAcq="false"
               SpecialCommand="false">
               
               <MaxDur />
               
               <MinDur />
               
               <Comments>1st epoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
                  CR-SPLIT="2" />
               
               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
         Number="07"
         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
                  <Value>C:\Documents and Settings\mbrown\Local Settings\Temp\OPVisit45761.xml</Value>
               </OpToolDataString>
            </ToolDataItem>
            
            <ToolDataItem
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               <OpToolDataDate>
                  
                  <Time>1172694604874</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical

2nd epoch</Comments>
         
         <TicData>
            
            <TicFileString>
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(Tic-Obset
 :proposal-id 10860
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 :obset-id "07"
 :pcs-mode "FGS"
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(Tic-Orbit
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 :visit-id "07"
 :orbit-number 1
 :pcs-time 355
 :si-vis-utilization 2772
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 :max-dark-utilization 1920
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            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
               Days="3.0" />
            
            <To
               Days="7.0" />
         </AfterVisit>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
            Type="Pattern"
            Pattern="1">
            
            <Exposure
               Number="1"
               TargetName="ORCUS"
               Config="ACS/HRC"
               Opmode="ACCUM"
               Aperture="HRC"
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               TimePerExposure="550.0"
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               RequiresUplink="false"
               Expand="false"
               LowSky="false"
               Shadow="false"
               NewAlignment="false"
               NewObset="false"
               NewObsetFullAcq="false"
               SpecialCommand="false">
               
               <MaxDur />
               
               <MinDur />
               
               <Comments>1st eoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
                  CR-SPLIT="2" />
               
               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="1"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="2"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="2"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
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         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
                  <Value>C:\Documents and Settings\mbrown\Local Settings\Temp\OPVisit45762.xml</Value>
               </OpToolDataString>
            </ToolDataItem>
            
            <ToolDataItem
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               <OpToolDataDate>
                  
                  <Time>1172694607937</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical

3rd epoch</Comments>
         
         <TicData>
            
            <TicFileString>
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(Tic-Obset
 :proposal-id 10860
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 :obset-id "08"
 :pcs-mode "FGS"
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(Tic-Orbit
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 :pcs-time 355
 :si-vis-utilization 2772
 :al-overhead-at-end 0
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</TicFileString>
            
            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
               Days="8.0" />
            
            <To
               Days="12.0" />
         </AfterVisit>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
            Type="Pattern"
            Pattern="1">
            
            <Exposure
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               TargetName="ORCUS"
               Config="ACS/HRC"
               Opmode="ACCUM"
               Aperture="HRC"
               SpElement="F606W"
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               NewObsetFullAcq="false"
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               <MaxDur />
               
               <MinDur />
               
               <Comments>1st eoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
                  CR-SPLIT="2" />
               
               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
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         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
                  <Value>C:\Documents and Settings\mbrown\Local Settings\Temp\OPVisit45763.xml</Value>
               </OpToolDataString>
            </ToolDataItem>
            
            <ToolDataItem
               Key="OpTimeStamp">
               
               <OpToolDataDate>
                  
                  <Time>1172694610984</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical

4th epoch</Comments>
         
         <TicData>
            
            <TicFileString>
(Tic-Visit
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(Tic-Obset
 :proposal-id 10860
 :visit-id "09"
 :obset-id "09"
 :pcs-mode "FGS"
 )

(Tic-Orbit
 :proposal-id 10860
 :visit-id "09"
 :orbit-number 1
 :pcs-time 355
 :si-vis-utilization 2772
 :al-overhead-at-end 0
 :internal-dur-at-end 199
 :dark-offset NIL
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 :max-dark-utilization 1920
 :low-sky "N"
 :pcs-visibility 3132
 :pcs-gap 0
 )
</TicFileString>
            
            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
               Days="15.0" />
            
            <To
               Days="20.0" />
         </AfterVisit>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
            Type="Pattern"
            Pattern="1">
            
            <Exposure
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               TargetName="ORCUS"
               Config="ACS/HRC"
               Opmode="ACCUM"
               Aperture="HRC"
               SpElement="F606W"
               NumberOfIterations="1"
               TimePerExposure="550.0"
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               RequiresUplink="false"
               Expand="false"
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               Shadow="false"
               NewAlignment="false"
               NewObset="false"
               NewObsetFullAcq="false"
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               <MaxDur />
               
               <MinDur />
               
               <Comments>1st eoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
                  CR-SPLIT="2" />
               
               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="3"
                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
         Number="10"
         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
                  <Value>C:\Documents and Settings\mbrown\Local Settings\Temp\OPVisit45764.xml</Value>
               </OpToolDataString>
            </ToolDataItem>
            
            <ToolDataItem
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               <OpToolDataDate>
                  
                  <Time>1172694614437</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical

5th epoch</Comments>
         
         <TicData>
            
            <TicFileString>
(Tic-Visit
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(Tic-Obset
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 :pcs-mode "FGS"
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(Tic-Orbit
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 :al-overhead-at-end 0
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 :pcs-visibility 3132
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</TicFileString>
            
            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
               Days="22.0" />
            
            <To
               Days="28.0" />
         </AfterVisit>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
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            Pattern="1">
            
            <Exposure
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               TargetName="ORCUS"
               Config="ACS/HRC"
               Opmode="ACCUM"
               Aperture="HRC"
               SpElement="F606W"
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               TimePerExposure="550.0"
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               RequiresUplink="false"
               Expand="false"
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               Shadow="false"
               NewAlignment="false"
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               NewObsetFullAcq="false"
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               <MaxDur />
               
               <MinDur />
               
               <Comments>1st eoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
                  CR-SPLIT="2" />
               
               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="1"
                     OrbitNumber="1" />
                  
                  <SubExposure
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                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
      
      <Visit
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         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
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            </ToolDataItem>
            
            <ToolDataItem
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               <OpToolDataDate>
                  
                  <Time>1172694617484</Time>
               </OpToolDataDate>
            </ToolDataItem>
         </ToolData>
         
         <Comments>6 visits are required to determine the orbit of the satellite of Orcus. The timing of the visits is time critical


6th epoch</Comments>
         
         <TicData>
            
            <TicFileString>
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(Tic-Obset
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 :pcs-mode "FGS"
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(Tic-Orbit
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 :max-dark-utilization 1920
 :low-sky "N"
 :pcs-visibility 3132
 :pcs-gap 0
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</TicFileString>
            
            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
         </TicData>
         
         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
               Days="35.0" />
            
            <To
               Days="40.0" />
         </AfterVisit>
         
         <SeqWithin>
            
            <VisitList />
         </SeqWithin>
         
         <OnHoldComments />
         
         <ExposureGroup
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            Pattern="1">
            
            <Exposure
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               <MaxDur />
               
               <MinDur />
               
               <Comments>1st eoch for satellite orbit determination</Comments>
               
               <InstrumentParameters
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               <SubExposures>
                  
                  <SubExposure
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                     SplitNumber="1"
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                     OrbitNumber="1" />
                  
                  <SubExposure
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            </Exposure>
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      </Visit>
      
      <Visit
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         Status="completed">
         
         <ToolData>
            
            <ToolDataItem
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               <OpToolDataString>
                  
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               <OpToolDataDate>
                  
                  <Time>1172694620530</Time>
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         <Comments>Observations to determine the orbit of the KBO satellite.

1st epoch</Comments>
         
         <TicData>
            
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            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
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         <GuidingTolerance>
            
            <Angle />
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         <SeqWithin>
            
            <VisitList />
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         <OnHoldComments />
         
         <ExposureGroup
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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      <Visit
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         <ToolData>
            
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                  <Time>1172694623593</Time>
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         <Comments>Observations to determine the orbit of the KBO satellite.

2nd epoch</Comments>
         
         <TicData>
            
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            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
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         <GuidingTolerance>
            
            <Angle />
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         <AfterVisit
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            <From
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            <To
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         <OnHoldComments />
         
         <ExposureGroup
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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                  <SubExposure
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      <Visit
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               <OpToolDataDate>
                  
                  <Time>1172694626671</Time>
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         <Comments>Observations to determine the orbit of the KBO satellite.

3rd epoch</Comments>
         
         <TicData>
            
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         <GuidingTolerance>
            
            <Angle />
         </GuidingTolerance>
         
         <AfterVisit
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            <From
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            <To
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      <Visit
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               <OpToolDataDate>
                  
                  <Time>1172694629734</Time>
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         <Comments>Observations to determine the orbit of the KBO satellite.

4th epoch</Comments>
         
         <TicData>
            
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            <TicDataCurrent>true</TicDataCurrent>
            
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         <GuidingTolerance>
            
            <Angle />
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         <AfterVisit
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            <From
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         <OnHoldComments />
         
         <ExposureGroup
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      <Visit
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         <Comments>Observations to determine the orbit of the KBO satellite.

5th epoch</Comments>
         
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            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
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         <GuidingTolerance>
            
            <Angle />
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         <AfterVisit
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            <From
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         <OnHoldComments />
         
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      <Visit
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         <Comments>Observations to determine the orbit of the KBO satellite.

6th epoch</Comments>
         
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            <TicDataCurrent>true</TicDataCurrent>
            
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                     OrbitNumber="1" />
                  
                  <SubExposure
                     PrimaryPatternPosition="4"
                     SplitNumber="2"
                     OrbitNumber="1" />
               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
   </Visits>
</HSTProposal>

