! Proposal 6193, submission 2
! PI: Surdej, Jean
! Received Fri Mar 22 15:30:04 EST 1996
! From: surdej@stsci.edu
! +====================+
! | PED OUTPUT PRODUCT |
! +====================+
!
! /lethe/data1/surdej/RPS2DEMO/6193.prop
! Generated by PREPROCESSOR, version 6.0e
! Date: Thu Jan 11 16:13:00 EST 1996
Proposal_Information
Title: PSF Characterization
Proposal_Category: CAL/WFC
Scientific_Category:
Cycle: 5
Investigators
PI_Name: Surdej, Jean
PI_Institution: STScI
CoI_Name: Fruchter, Andy
CoI_Institution: STScI
Contact: Y
CoI_Name: Gonzaga, Shireen
CoI_Institution: STScI
Contact: N
CoI_Name: Baggett, Sylvia
CoI_Institution: STScI
Contact: N
Abstract:
Provide a subsampled PSF over the full field to allow PSF fitting
photometry, test PSF subtraction as well as dithering techniques
(cf. effects of the OTA breathing and CCD gain).
Questions
Observing_Description:
Measure PSF over full field in photometric filters in order to update the
TIM and TINYTIM models and to allow accurate empirical PSFs to be derived
for PSF fitting photometry. These observations will also be useful in order
to test PSF subtraction and dithering techniques at various locations on the
CCD chips. With one orbit per photometric filter, a spatial scan is performed
over a 4X4 grid on the CCD. The step size is 0.025 arcseconds.
This gives a critically sampled PSF over most of the visible range. The
crowded Omega Cen field is used. 40 (with gain = 15) sec images are taken
through each of the photometric filters (F336W, F439W, F555W, F675W and F814W).
Effects of the OTA breathing (1 additional orbit) and CCD gain (1 additional
orbit) onto the dithering and PSF subtraction techniques will also be
investigated. Data volume will be a problem, so special tape recorder
management will be called for. Based partially on cycle 4 program 5575, which
used a similar field. The proposal also allows a check for subpixel phase
effects on the integrated photometry.
Output -- Subsampled PSFs for photometry codes. Data for comparison with PSF
and dithering codes. Provides measurement of pixel phase effect on photometry
(sub pixel QE variations exist). The chosen field will have tens of well
exposed stars in each chip. Each star will be measured 16 times per
filter at different pixel phase. The proposal therefore provides, in
principle, a high signal to noise, critically sampled PSF. This would leave
PSF fitting photometrists in a much better position than now, where pixel
undersampling clearly limits the results. The result will be largely limited
by breathing variations in focus. It is hard to judge the PSF accuracy that
will result. If breathing is less than 5 microns peak to peak, the resulting
PSFs should be good to about 10% in each pixel. Breathing effects will be
investigated (1 additional orbit) as well as the gain dependence (1 additional
orbit). PSF fitting results using this calibration would of course be much
more accurate. In addition, the test gives a direct measurement of sub-pixel
phase effects on photometry, which should be measured to better than 1%.
Real_Time_Justification:
Calibration_Justification:
Additional_Comments:
SCHEDULING COMMENTS:
- Proposal currently written as two single visits requiring in total 7 orbits
but may be broken into more visits for easier scheduling as long as same
orientation is maintained. Because of a desirable comparison between the PSFs
derived for the different filters, we should like the entire proposal to be
executed within 2 weeks. This is necessary to minimize the spacecraft
temperature differences that result from orbital precession effects.
- Requires special tape recorder management
- FYI - Brad Whitmore selected the target star 1-- it has lots of photometry
information. It is star no. 1461 from Harris, AJ 1993, 105 1196.
- Target star 999 had already been selected in the non executed proposal 5575
(cycle 4)
Fixed_Targets
Target_Number: 1
Target_Name: OMEGA-CEN-1
Alternate_Names: Harris1461
Description: CALIBRATION,PHOTOMETRIC,
Position: RA=13H 25M 34.5S +/- 0.100S,DEC=-47D 35' 28.0" +/- 1.00"
Equinox: J2000
RV_or_Z:
RA_PM: 0.0
Dec_PM: 0.0
Epoch:
Annual_Parallax: 0.0
Flux:
V = 16.4
Comments:
Target_Number: 2
Target_Name: OMEGA-CEN-3
Alternate_Names: Harris1461_offset
Description: CALIBRATION,PHOTOMETRIC,
Position: XI-OFF = 0.25" +/- 0.01",ETA-OFF = 0.25" +/- 0.01",FROM 1
Equinox: J2000
RV_or_Z:
RA_PM: 0.0
Dec_PM: 0.0
Epoch:
Annual_Parallax: 0.0
Flux:
V = 16.4
Comments:
! Target_Number: 999
! Target_Name: OMEGA-CEN-2
!Alternate_Names:
! Description: CALIBRATION,
! Position: RA=13H 25M 37.04S +/- 0.100S,DEC=-47D 35' 38.3" +/- 1.00"
! Equinox: J2000
! RV_or_Z:
! RA_PM: 0.0
! Dec_PM: 0.0
! Epoch:
!Annual_Parallax: 0.0
! Flux:
! V = 14.5
! Comments:
Solar_System_Targets
Generic_Targets
Scan_Data
Scan_Number: 1
FGS_Scan:
Cont_or_Dwell: D
Dwell_Points: 4
Dwell_Secs: 40
Scan_Width: 0.375
Scan_Length: 0.375
Sides_Angle: 90.0
Number_Lines: 4
Scan_Rate:
First_Line_PA: 270
Scan_Frame: S/C
Length_Offset: 0.0
Width_Offset: 0.0
! Scan_Number: 2
! FGS_Scan:
! Cont_or_Dwell: D
! Dwell_Points: 4
! Dwell_Secs: 40
! Scan_Width: 0.375
! Scan_Length: 0.375
! Sides_Angle: 270.0
! Number_Lines: 4
! Scan_Rate:
! First_Line_PA: 90
! Scan_Frame: S/C
! Length_Offset: 0.0
! Width_Offset: 0.0
!Visits
Visit_Number: 01
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 100
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F555W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments:
Visit_Number: 02
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 200
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F336W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments:
Visit_Number: 03
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 300
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F439W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments:
Visit_Number: 04
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 400
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F675W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments:
Visit_Number: 05
Visit_Requirements: GROUP 5-6 WITHIN 2D
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 500
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F814W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments: To study breathing effects
Visit_Number: 06
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 600
Target_Name: OMEGA-CEN-3
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F814W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments: To study breathing effects
Visit_Number: 07
Visit_Requirements:
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 700
Target_Name: OMEGA-CEN-1
Config: WFPC2
Opmode: IMAGE
Aperture: PC1
Sp_Element: F814W
Wavelength:
Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL
Number_of_Iterations: 1
Time_Per_Exposure: 40S
Special_Requirements:
SPATIAL SCAN 1
Comments: To study gain effects
Data_Distribution ! Defaults indicated; change if desired
Medium: 8MM
Blocking_Factor: 10
Ship_To: PI_Address
Ship_Via: UPS
Recipient_Email:
! Let us know what you think of this template and software!
! Please send a list of your likes and dislikes to your Program Coordinator__Diagnostic-Sum-Section__
Software-Version (Controller= 6.0)
Preprocessor (Errors= 0 Fatal-Errors= 0 )
Validation (Errors= 0 Fatal-Errors= 0 )
Transformation (Errors= 0 Fatal-Errors= 0 )
CASM (Errors= 0 Fatal-Errors= 0 )
__User-Comments__
Marc,
I could not get the ps files for this proposal (system full ...) but
the proposal, split into 7 individual visits, should be OK now. Just
have a quick look at it and let me know if you also find it OK.
Greetings, Jean