<?xml version="1.0" encoding="ISO-8859-1"?>

<HSTProposal
   Phase1ID="10842"
   Phase2ID="10842"
   Phase="Phase II"
   AptVersion="Version 16.0.2 ">
   <!--**********************************************************************************************************************-->
   <!--This file is automatically generated and should not be edited by hand. Editing this file directly is at your own risk.-->
   <!--**********************************************************************************************************************-->
   
   <ProposalInformation
      Category="GO"
      PureParallelProposal="false"
      Cycle="15"
      STScIEditNumber="17">
      
      <Title>A Cepheid Distance to the Coma Cluster</Title>
      
      <Abstract>We propose to use the Advanced Camera for Surveys to search for Cepheid variables in two spiral galaxies in the core of the Coma cluster.  A direct application of the canonical primary distance indicator at 100 Mpc will measure the far-field Hubble constant free of many of the systematic uncertainties which beset current determinations relying on secondary indicators.  Establishing the far-field H_o with Cepheids will provide one of the strongest links in the extragalactic distance scale and will directly calibrate the fiducial fundamental plane of elliptical galaxies in Coma.

With ACS/HRC, S/N=5 to 10 or better can be reached for Cepheids with periods of 40d to 70d at mean light in 5 orbits with the F606W filter if H_o=72 km/s/Mpc.  Efficient detection and phasing can be done with twelve epochs optimally spaced for periods of 40-70d.</Abstract>
      
      <PrincipalInvestigator
         Honorific="Dr."
         FirstName="Kem"
         LastName="Cook"
         ESAMember="false"
         UniqueID="421"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="Lawrence Livermore National Laboratory"
            USState="CA"
            Country="USA" />
      </PrincipalInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Michael"
         MiddleInitial="D."
         LastName="Gregg"
         ESAMember="false"
         UniqueID="807"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="University of California - Davis"
            USState="CA"
            Country="USA" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Lucas"
         MiddleInitial="M."
         LastName="Macri"
         ESAMember="false"
         UniqueID="4484"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="National Optical Astronomy Observatories, AURA"
            USState="AZ"
            Country="USA" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Jeremy"
         MiddleInitial="R."
         LastName="Mould"
         ESAMember="false"
         UniqueID="1895"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="National Optical Astronomy Observatories, AURA"
            USState="AZ"
            Country="USA" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Peter"
         MiddleInitial="B."
         LastName="Stetson"
         ESAMember="false"
         UniqueID="2482"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="Dominion Astrophysical Observatory"
            Country="Canada" />
      </CoInvestigator>
      
      <CoInvestigator
         Honorific="Dr."
         FirstName="Douglas"
         MiddleInitial="L."
         LastName="Welch"
         ESAMember="false"
         UniqueID="2742"
         AdminUSPI="false"
         Contact="false"
         AddressVerifiedCycle="15">
         
         <Address
            Institution="McMaster University"
            Country="Canada" />
      </CoInvestigator>
      
      <Questions>
         
         <Phase2Questions>
            
            <ObservingDescription>The observations will consist of a dozen 5-orbit visits using F606W
and six 5-orbit visits using F814W to NGC4911, and similar set for
NGC4921.  This duplicates the observing strategy of the Key Project.
The hefty request for I-band observations is made because the
precision in I-band governs the error budget in reddening estimates
which are critical to obtaining &lt;M&gt;; it is prudent to attempt to
match photometric uncertainties in both filters as closely as
possible.  These data provide near optimum imaging for detection and
phasing of Cepheids with periods of 45 to 90 days.  Each orbit will
consist of a CRsplit WFC exposure.  To attain maximum photometric depth, we
will not dither during a visit so that all five orbits can be stacked without resampling; this also minimizes 
the area impacted by hot pixels which we will mask or interpolate over.
We will dither in very small steps between visits.  Even with thelong exposures, we estimate that &lt;10
pixels will be lost to CRs.  Each orbit has a 53 minute visibility period or longer so each
5-orbit visit will total 12500s of open shutter time.

All available windows from mid-December to mid-March with visibility
periods of 53 minutes or longer are acceptable (needed) for this program.
We have found it necessary to use three orients (299, 266, and 233) to schedule the observations
over the 90d window needed to phase the longest period Cepheids.
We have optimized the sampling intervals for maximum detection and phasing efficiency for
Cepheids with periods of 45-90d; the success of the program is contingent upon maintaining
these spacings, at least approximately.

The parallel NICMOS and WFPC2 deep field imaging observing strategy is
dictated by the Cepheid observations.  The time will be divided
roughly equally among the  F450W, F606W,
and F814W for WFPC2 and 
F110W and F160W for NICMOS Camera 3.</ObservingDescription>
            
            <RealtimeJustification />
            
            <CalibrationJustification />
            
            <AdditionalComments />
         </Phase2Questions>
      </Questions>
      
      <Orbits
         ThisCycle2GyroPrimary="180"
         ThisCycle2GyroParallel="360"
         NextCycle2GyroPrimary="0"
         NextCycle2GyroParallel="0"
         AfterNext2GyroPrimary="0"
         AfterNext2GyroParallel="0" />
      
      <Phase1ProposalInformation
         TotalTargets="1"
         Attachment="/Users/gregg/pro/hst/c15/comaceph/obs.pdf">
         
         <ScientificCategory>COSMOLOGY</ScientificCategory>
         
         <ScientificKeyword1
            Keyword="COSMOLOGICAL PARAMETERS AND DISTANCE SCALE" />
         
         <ScientificKeyword2
            Keyword="RESOLVED STELLAR POPULATIONS" />
         
         <ScientificKeyword3
            Keyword="CLUSTERS OF GALAXIES" />
         
         <ScientificKeyword4
            Keyword="STELLAR POPULATIONS IN EXTERNAL GALAXIES" />
         
         <ProprietaryPeriod>12</ProprietaryPeriod>
         
         <CalibProp>false</CalibProp>
         
         <SpitzerHours>0.0</SpitzerHours>
         
         <Treasury>false</Treasury>
         
         <Legacy>false</Legacy>
         
         <Theory>false</Theory>
         
         <LargeProgram>true</LargeProgram>
         
         <Spitzer>false</Spitzer>
         
         <Survey>false</Survey>
      </Phase1ProposalInformation>
      
      <Phase2ProposalInformation
         PCFlag="true">
         
         <Availability>AVAILABLE</Availability>
      </Phase2ProposalInformation>
   </ProposalInformation>
   
   <Targets>
      
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         Name="NGC4911-WFC"
         Number="1"
         ReferenceFrame="ICRS">
         
         <PrimaryCategory>GALAXY</PrimaryCategory>
         
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            <Description>SPIRAL</Description>
            
            <Description>SPIRAL ARM</Description>
            
            <Description>STAR FORMING REGION</Description>
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               Band="V"
               Magnitude="13" />
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               Degrees="+27"
               Arcmin="47"
               Arcsec="28.00" />
            
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               Arcsec="0.1" />
            
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         <ProvisionalDEC>+27 53 10.00</ProvisionalDEC>
         
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         Name="NGC4911-HRC"
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            <Description>STAR FORMING REGION</Description>
            
            <Description>SPIRAL ARM</Description>
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      </FixedTarget>
      
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         Name="NGC4911-PA233"
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         <PrimaryCategory>GALAXY</PrimaryCategory>
         
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      </FixedTarget>
      
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            <Description>DISK</Description>
            
            <Description>SPIRAL</Description>
            
            <Description>SPIRAL ARM</Description>
            
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         Name="NGC4921-PA233"
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         ReferenceFrame="ICRS">
         
         <PrimaryCategory>GALAXY</PrimaryCategory>
         
         <PrimaryDescription>
            
            <Description>DISK</Description>
            
            <Description>SPIRAL</Description>
            
            <Description>SPIRAL ARM</Description>
            
            <Description>STAR FORMING REGION</Description>
         </PrimaryDescription>
         
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               Magnitude="13" />
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      </FixedTarget>
   </Targets>
   
   <Observations>
      
      <Observation
         TargetName="NGC4911-PA296-A"
         Instrument="ACS"
         Number="1"
         NumberOfOrbits="90"
         NumberOfIterations="1"
         TotalOrbits="90"
         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>F606W</SpectralElement>
               
               <SpectralElement2>CLEAR2S</SpectralElement2>
            </Configuration>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F814W</SpectralElement>
               
               <SpectralElement2>CLEAR2S</SpectralElement2>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="true"
            SameOrient="false" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="LOWSKY;" />
      </Observation>
      
      <Observation
         TargetName="NGC4921-WFC"
         Instrument="ACS"
         Number="2"
         NumberOfOrbits="90"
         NumberOfIterations="1"
         TotalOrbits="90"
         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>F606W</SpectralElement>
               
               <SpectralElement2>CLEAR2S</SpectralElement2>
            </Configuration>
            
            <Configuration>
               
               <Config>ACS/HRC</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F814W</SpectralElement>
               
               <SpectralElement2>CLEAR2S</SpectralElement2>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="false"
            Shadow="false"
            LowSky="true"
            SameOrient="false" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="LOWSKY;" />
      </Observation>
      
      <Observation
         TargetName="WFPC2-DEEP-FIELD-A"
         Instrument="WFPC2"
         Number="3"
         NumberOfOrbits="90"
         NumberOfIterations="1"
         TotalOrbits="90"
         PureParallel="false"
         CoordinatedParallel="true"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="false">
         
         <Configurations>
            
            <Configuration>
               
               <Config>WFPC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F300W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>WFPC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F450W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>WFPC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F606W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>WFPC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F814W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="NICMOS-DEEP-FIELD-A-COPY"
         Instrument="NICMOS"
         Number="4"
         NumberOfOrbits="90"
         NumberOfIterations="1"
         TotalOrbits="90"
         PureParallel="false"
         CoordinatedParallel="true"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="false">
         
         <Configurations>
            
            <Configuration>
               
               <Config>NIC3</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F110W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>NIC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F110W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>NIC3</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F160W</SpectralElement>
            </Configuration>
            
            <Configuration>
               
               <Config>NIC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Coronography>No</Coronography>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F160W</SpectralElement>
            </Configuration>
         </Configurations>
         
         <ObservationRequirements
            NoConstraints="true" />
         
         <SuitabilityResults
            DaysHigh="0"
            DaysHighMed="0"
            DaysLowMed="0"
            DaysLow="0"
            Visibility=""
            OrbitsPerDay="0"
            ObservationRequirements="NOCONSTRAINTS" />
      </Observation>
      
      <Observation
         TargetName="WFPC2-DEEP-FIELD-B"
         Instrument="WFPC2"
         Number="5"
         NumberOfOrbits="90"
         NumberOfIterations="1"
         TotalOrbits="90"
         PureParallel="false"
         CoordinatedParallel="true"
         TargetOfOpportunity="false"
         CVZ="false"
         Duplication="false">
         
         <Configurations>
            
            <Configuration>
               
               <Config>WFPC2</Config>
               
               <ScienceMode>Imaging</ScienceMode>
               
               <Polarimetry>No</Polarimetry>
               
               <SpectralElement>F300W</SpectralElement>
            </Configuration>
            
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               </SubExposures>
            </Exposure>
         </ExposureGroup>
      </Visit>
   </Visits>
</HSTProposal>

