6195( 5) - 02/16/96 12:49 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6195 Version: 5 Check-in Date: 16-Feb-1996 12:42:43 1.Proposal Title: Flat Field Check ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle CAL/WFC 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Brad Whitmore STScI ------------------------------------------------------------------------------------ 6. Abstract The purpose of this proposal is to check the quality of flat fields and estimate errors in them. ------------------------------------------------------------------------------------ 6195( 5) - 02/16/96 12:49 - [ 2] Observations Description ------------------------ The crowded Omega Cen field is positioned with a bright star at the center of each CCD in turn. Images are taken through each of the photometric filters-- F336W, F439W, F555W, F675W, and F814W. An exposure using the F555W is also obtained with a preflash of 160 electrons. In addition, an exposure is taken using the F606W filter. Assume that the CTE proposal has been run and gives satisfactory results. After pipeline processing, each image will be reduced by aperture photometry to measure the RMS errors in the flat fields. The RMS error will be determined by the additional noise in the independent measurements over the expected variance of less than 1% from photon statistics. The single bright star at the center of each chip independently estimates the chip to chip normalization error. If CTE calibration fails, this proposal may need to be run with preflash (and take more time or do less filters.) NOTE TO SCHEDULERS- Bill Workman is the PC for this proposal, and is familiar with the requirements. This program requires 4 orbits. In each orbit, the following sequence of filter observations are taken: Preflash & F555W, F555W, F336W, F439W, F675W, and F814W. But a different aperture is used in each orbit, for example, the PC for orbit 1, the WF2 for orbit 2, and so forth. The first observations in each orbit is a preflash-F555W pair; The preflash should be done during occultation (or during guide star acq./re-acq. if possible) but must be followed within 5 to 10 minutes by the subsequent F555W exposure. This is because the INTFLAT is set to READ=NO, and we are worried about cosmic ray accumulation in the preflash. - SG Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6195( 5) - 02/16/96 12:49 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WCEN CALIBRATION,PHOTOMETRIC RA=13H 25M 37.04S +/- 0.100S, J2000 V = 16.4 , DEC= -47D 35' 38.3" +/- 1.00" 6195( 5) - 02/16/96 12:49 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 INTFLAT WFPC2 IMAGE PC1 F502N READ=NO,BLADE=A 1 180S Comments: Preflash of 160 electrons. Assumes 0.929 electrons/sec in PC1 and shutter blade A. Schedule in occultation or during GS acq/reacq. Lines 1-8 in an orbit. ------------------------------------------------------------------------------------------------------------------------------------ 2 WCEN WFPC2 IMAGE PC1 F555W 1 160S AFTER BY 5M TO 10M Comments: execute 2 within 10 min of 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 WCEN WFPC2 IMAGE PC1 F555W 1 160S SEQ 2-8 NON-INT Comments: please put externals in one alignment ------------------------------------------------------------------------------------------------------------------------------------ 4 WCEN WFPC2 IMAGE PC1 F336W CR-SPLIT=0.5 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 5 WCEN WFPC2 IMAGE PC1 F439W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 6 WCEN WFPC2 IMAGE PC1 F675W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 7 WCEN WFPC2 IMAGE PC1 F814W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 8 WCEN WFPC2 IMAGE PC1 F606W 1 100S ------------------------------------------------------------------------------------------------------------------------------------ 11 INTFLAT WFPC2 IMAGE WF2 F502N READ=NO,BLADE=A 1 30S Comments: Preflash of 160 electrons. Assumes 5.27 electrons/sec in WF2 and shutter blade A. Schedule in occultation or during GS acq/reacq. Lines 11-18 in an orbit. ------------------------------------------------------------------------------------------------------------------------------------ 12 WCEN WFPC2 IMAGE WF2 F555W 1 160S AFTER BY 5M TO 10M Comments: execute 12 within 10 min of 11 ------------------------------------------------------------------------------------------------------------------------------------ 13 WCEN WFPC2 IMAGE WF2 F555W 1 160S SEQ 12-18 NON-INT Comments: please put externals in one alignment ------------------------------------------------------------------------------------------------------------------------------------ 14 WCEN WFPC2 IMAGE WF2 F336W CR-SPLIT=0.5 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 15 WCEN WFPC2 IMAGE WF2 F439W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 16 WCEN WFPC2 IMAGE WF2 F675W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 17 WCEN WFPC2 IMAGE WF2 F814W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 18 WCEN WFPC2 IMAGE WF2 F606W 1 100S ------------------------------------------------------------------------------------------------------------------------------------ 6195( 5) - 02/16/96 12:49 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 21 INTFLAT WFPC2 IMAGE WF3 F502N READ=NO,BLADE=A 1 30S Comments: Preflash of 160 electrons. Assumes 5.2 electrons/sec in WF3 and shutter blade A. Schedule in occultation or during GS acq/reacq. Lines 21-28 in an orbit. ------------------------------------------------------------------------------------------------------------------------------------ 22 WCEN WFPC2 IMAGE WF3 F555W 1 160S AFTER BY 5M TO 10M Comments: execute 22 within 10 min of 21 ------------------------------------------------------------------------------------------------------------------------------------ 23 WCEN WFPC2 IMAGE WF3 F555W 1 160S SEQ 22-28 NON-INT Comments: please put externals in one alignment ------------------------------------------------------------------------------------------------------------------------------------ 24 WCEN WFPC2 IMAGE WF3 F336W CR-SPLIT=0.5 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 25 WCEN WFPC2 IMAGE WF3 F439W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 26 WCEN WFPC2 IMAGE WF3 F675W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 27 WCEN WFPC2 IMAGE WF3 F814W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 28 WCEN WFPC2 IMAGE WF3 F606W 1 100S ------------------------------------------------------------------------------------------------------------------------------------ 31 INTFLAT WFPC2 IMAGE WF4 F502N READ=NO,BLADE=A 1 50S Comments: Preflash of 160 electrons. Assumes 3.48 electrons/sec in WF4 and shutter blade A. Schedule in occultation or during GS acq/reacq. Lines 31-38 in an orbit. ------------------------------------------------------------------------------------------------------------------------------------ 32 WCEN WFPC2 IMAGE WF4 F555W 1 160S AFTER BY 5M TO 10M Comments: execute 32 within 10 min of 31 ------------------------------------------------------------------------------------------------------------------------------------ 33 WCEN WFPC2 IMAGE WF4 F555W 1 160S SEQ 32-38 NON-INT Comments: please put externals in one alignment ------------------------------------------------------------------------------------------------------------------------------------ 34 WCEN WFPC2 IMAGE WF4 F336W CR-SPLIT=0.5 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 35 WCEN WFPC2 IMAGE WF4 F439W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 36 WCEN WFPC2 IMAGE WF4 F675W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 37 WCEN WFPC2 IMAGE WF4 F814W CR-SPLIT=0.5 1 200S ------------------------------------------------------------------------------------------------------------------------------------ 38 WCEN WFPC2 IMAGE WF4 F606W 1 100S ------------------------------------------------------------------------------------------------------------------------------------ 6195( 5) - 02/16/96 12:49 - [ 6] Summary Form for Proposal 6195 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters READ=NO BLADE=A CR-SPLIT=0.5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category CAL/WFC ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER BY 5M TO 10M SEQ 2-8 NON-INT SEQ 12-18 NON-INT SEQ 22-28 NON-INT SEQ 32-38 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N F555W F336W F439W F675W F814W F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names INTFLAT WCEN ------------------------------------------------------------------------------------------------------------------------------------