!  +====================+
!  | PED OUTPUT PRODUCT |
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!
!  /data/charon4/smov/1022.prop
!  Generated by PREPROCESSOR, version 7.0
!  Date: Tue Dec 17 13:45:17 EST 1996

Proposal_Information
              Title: NICMOS Imaging of a Bright Stars Region
  Proposal_Category: GO
Scientific_Category: COOL STARS
              Cycle: 7


Investigators

            PI_Name: Joan Smith
     PI_Institution: University 1


           CoI_Name: John Brown
    CoI_Institution: University 2
            Contact: 


Abstract:
Use of the OFFSET option SAM-NO-REAC. Use of PATTERN-ORIENT.
Use of the readout mode ACCUM.

Questions


    Observing_Description:
This is the observation of a cluster of bright red stars with NIC2 and
the F165M, the F187N and the F237M filters.
The proposers choose to avoid saturation of the brightest stars in the
field, and select exposure times of 20 seconds in the F237M
filter. For such short exposure times the readout mode ACCUM can be
used, since cosmic rays should not be a concern.  For the F165M and
F187N filters, the MULTIACCUM sequence STEP256, with NSAMP=11 (total
exposure time per sequence = 256 seconds) is used.
For the background affected filters F187N and F237M, the SPIRAL-DITH-CHOP
pattern is selected. The clusters "sits" in a rather crowded region
and in order to get suitable background images for the sky subtraction
of the long wavelength filters a chop of 180 seconds is required in the
direction PA=30 degrees.
The chop throw is large enough that guide stars will not be mantained
during the background observations. Since the exposures in the F237M
filter are short, the OFFSET option SAM-NO-REACQ can be used for the
observation in this filter. This option implies that when the
telescope comes back to the target the guide stars will NOT be
reacquired. The drawback will be a pointing uncertainty of 1
milliarc/second due to telescope drifts. For short exposure times,
this drift may not be a concern.
For the SPIRAL-DITH-CHOP pattern the direction PA=30 degrees
translates into a value of the parameter PATTERN-ORIENT=120
(90+30 degrees, to align the direction of the chop along PA=30
degrees).
A small dither step (0".75 = 10 pixels) in the pattern will ensure
that each star will not fall twice on the same pixel, to help
photometric accuracy. For the observations in the F165M filter, the
SPIRAL-DITH pattern, with the same dither step as the other filters is
selected, to sample identical regions. For the F165M filter background
observations are NOT required.


  Real_Time_Justification:


Calibration_Justification:


      Additional_Comments:



Fixed_Targets

  Target_Number: 1
    Target_Name: BRIGHTCLUS
Alternate_Names: Nice Cluster
    Description: STELLAR CLUSTER
       Position: RA=10H 35M 49.40S +/- 0.02S,DEC=33D 19' 58.0" +/- 0.7"
        Equinox: J2000
        RV_or_Z: 
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                F(1.60)=0.00
       Comments: The value of the flux is in units of Jy, at 1.6 microns


Solar_System_Targets


Generic_Targets


Scan_Data


Visits

      Visit_Number: 01
Visit_Requirements: 
  On_Hold_Comments: 
    Visit_Comments: 

     Exposure_Number: 1
         Target_Name: BRIGHTCLUS
              Config: NIC2
              Opmode: ACCUM
            Aperture: NIC2
          Sp_Element: F237M
          Wavelength: 
 Optional_Parameters: PATTERN=SPIRAL-DITH-CHOP,NUM-POS=4,DITH-SIZE=0.75,CHOP-SIZE=180,PATTERN-ORIENT=120.,OFFSET=SAM-NO-REACQ,NREAD=1
Number_of_Iterations: 3
   Time_Per_Exposure: 20 S
Special_Requirements: 
            Comments: 


     Exposure_Number: 2
         Target_Name: BRIGHTCLUS
              Config: NIC2
              Opmode: MULTIACCUM
            Aperture: NIC2
          Sp_Element: F187N
          Wavelength: 
 Optional_Parameters: PATTERN=SPIRAL-DITH-CHOP,NUM-POS=4,DITH-SIZE=0.75,CHOP-SIZE=180,PATTERN-ORIENT=120.,SAMP-SEQ=STEP256,NSAMP=11
Number_of_Iterations: 3
   Time_Per_Exposure: DEF
Special_Requirements: 
            Comments: 


     Exposure_Number: 3
         Target_Name: BRIGHTCLUS
              Config: NIC2
              Opmode: MULTIACCUM
            Aperture: NIC2
          Sp_Element: F165M
          Wavelength: 
 Optional_Parameters: PATTERN=SPIRAL-DITH,NUM-POS=4,DITH-SIZE=0.75,SAMP-SEQ=STEP256,NSAMP=11
Number_of_Iterations: 2
   Time_Per_Exposure: DEF
Special_Requirements: 
            Comments: 


Data_Distribution         ! Defaults indicated; change if desired

         Medium: 8MM
        Ship_To: PI_Address
Recipient_Email: 

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