6815( 21) - 08/01/97 11:08 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6815 Version: 21 Check-in Date: 01-Aug-1997 11:06:41 1.Proposal Title: The Origin of the Polarization in the Gravitationally Lensed Cloverleaf BAL QSO H1413+1143 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle QSO ABSORPTION LINES GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: DAVID A. TURNSHEK UNIVERSITY OF PITTSBURGH CoI: Olivia Lupie Space Telescope Science Institute N CoI: Regina Schulte-Ladbeck University of Pittsburgh N ------------------------------------------------------------------------------------ 6. Abstract We propose a strategy to obtain WFPC2 polarimetry that will allow us to explore the polarization mechanism operating in the gravitationally lensed ``Cloverleaf'' broad absorption line (BAL) QSO H1413+1143. This is one of a number of BAL QSOs known to exhibit optical polarization, however the nature of the polarization is not understood in this class of object. This BAL QSO manifests itself as 4 lensed components, however the weakness of the broad emission lines in component D relative to components A,B,C, indicate that the size-scale of the amplified regions are substantially smaller for component D (microlensing) in comparison to components A,B,C. This fact should allow us to constrain the size-scale of the polarized light in the Cloverleaf. The net polarization of the Cloverleaf is ~ 4.5\% and the brightnesses of the components are not too different. If the polarization originates close in to the central source, all four components should be polarized equally. However, if the polarization originates in a large scattering region, component D should have near zero polarization while the remain components should have ~ 6\% polarization. While the polarizations are small, we can take advantage of the fact that we are looking for differences in polarizations between the 4 components, not an absolute polarization for any single component. We believe that the observing strategy we have developed for WFPC2 will allow us to measure differences in polarization on the order of ~ 1\%. However, even if we achieve an accuracy of ~ 2-- 3\%, we should be able to test the extreme model we propose. ------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 2] Observations Description ------------------------ SEE COMMENTS IN THE FIRST VISIT Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- THE POLARIMETRIC CALIBRATION OF THE DATA, BOTH FOR THE DIFFERENTIAL MEASUREMENT AND THE ABSOLUTE MEASUREMENT OF THE COMPONENT POLARIZATIONS WOULD BENEFIT IF THE FOLLOWING WFPC2 CALIBRATION OBSERVATIONS WERE TO BE TAKEN NEAR THE SCHEDULED TIME OF THIS OBSERVATION: 1) FLAT FIELDS WITHOUT AND WITH POLARIZERS 2) POLARIZATION STANDARDS 3) PSF STARS ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: ------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- GALAXY, GRAVITATIONAL RA=14H 15M 46.3S+/-0.1S, 2000 Z=2.54 V = 18.2 COMP-A LENS DEC=+11D 29' 43.6"+/-1.5" Comments: CLOVERLEAF HAS 4 LENSED COMPONENTS. IN 1992.33 V MAGs WERE A=18.2, B=18.4, C=18.4, D=18.6 (B-V COLOR OF COMPONENTS IS ABOUT 0.4 TO 0.6 MAG). THIS IS A. THE EPOCH IS THE LAST DATE OF HST WFPC2 MEASUREMENTS. THE ASTROMETRY IS BASED ON RESULTS FROM 5 DIFFERENT EPOCHS OF WFPC/WFPC2 MEASUREMENTS. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1994.97 0 0 0 2 H1413+1143- GALAXY, GRAVITATIONAL RA-OFF=0.02415S+/-0.00020S, DEC- 2000 Z=2.54 V = 18.6 COMP-A- LENS OFF=1.043"+/-0.0012", FROM1 OFFSET Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1994.97 0 0 0 3 G191B2B STAR RA=05H 05M 30.62S+/-0.01S, 2000 V = 11.78 DEC=+52D 49' 54.0"+/-0.1", PLATE B-V = -0.3 -ID=0005 E(B-V) = 0.0 Comments: PSF STAR, UNPOLARIZED STANDARD. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.115 0.0008 -0.0873 0 6815( 21) - 08/01/97 11:08 - [ 4] Visit: 01 Visit Requirements: SCHEDulability 100% AFTER 2 BY 1D TO 30D On Hold Comments: Additional Comments: THIS IS AN OBSERVATION OF A PSF STAR, DIRECT AND THROUGH THE POLARIZERS. IT IS ESSENTIAL THAT THE OBSERVATION BE TAKEN AT THE SAME ROLL (SAME ORIENT FLAGGED), AND THAT IT BE AS CLOSE IN TIME AS POSSIBLE TO A CLOVER VISIT. THE PSF STAR CHOSEN IS AN UNPOLARIZED STANDARD. WE WOULD LIKE TO GET AN OBSERVATION TAKEN VERY CLOSE TO ONE OF THE VISITS ON THE CLOVERLEAF, AND WITH THE SAME ROLL AS THE CLOVERLEAF HAS IN THAT PARTICULAR VISIT. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 G191B2B WFPC2 IMAGE WF2-FIX F555W 1 0.7 S ------------------------------------------------------------------------------------------------------------------------------------ 2 G191B2B WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 1.2 S POSition TARGet +12.5, POLQ -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 G191B2B WFPC2 IMAGE WF2-FIX F555W, 1 1.2 S POSition TARGet +12.5, POLQP15 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 G191B2B WFPC2 IMAGE WF2-FIX F555W, 1 1.2 S POSition TARGet +12.5, POLQN18 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 5 G191B2B WFPC2 IMAGE WF2-FIX F555W, 1 1.2 S POSition TARGet +12.5, POLQN33 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 5] Visit: 02 Visit Requirements: ORIENTation -43D TO -41D FROM 3 SCHEDulability 100% On Hold Comments: Additional Comments: WE USE THE POLFILTER AND ORIENT COMBINATION OF STRATEGY 2B TO GET A MEASUREMENT OF THE CLOVER AT A RELATIVE POLARIZER ORIENTATION OF 60D FROM THE FIRST OBSERVATION. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN33 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN33 -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 6] Visit: 03 Visit Requirements: SCHEDulability 100% GROUP 2-4 WITHIN 48H On Hold Comments: Additional Comments: NOTE: THIS PROGRAM NEEDS A SET OF RATHER RESTRICTIVE ROLL ANGLES. OBSERVING DESCRIPTION: THE GOAL OF THE OBSERVATIONS IS TO DETERMINE THE POLARIZATION IN THE 4 COMPONENTS (A,B,C,D) OF THE CLOVERLEAF QUASAR. THE POLARIZATION OF ALL 4 COMPONENTS TOGETHER WAS MEASURED FROM THE GROUND TO BE 1) SMALL AND 2) VARIABLE. THE POSSIBILITY OF A SIGNIFICANT POLARIZATION VARIATION INCREASES WITH TIME, SO IT IS VERY DESIREABLE TO HAVE CLOSELY SPACED OBSERVATIONS. 1) SMALL MEANS WE'RE FIGHTING THE WFPC2 FLAT-FIELD. OUR STRATEGY INVOLVES A DIFFERENTIAL MEASUREMENT OF A AND D, WHERE WE ATTEMPT TO MEASURE A AND D ON THE SAME PIXEL IN A PLACE ON THE WF2 WHERE THE FLAT-FIELD IS GOOD. WE ALSO DITHER. (NOTE THAT WE USE TARGET OFFSETS IN RA AND DEC TO DEFINE THE LOCATION OF D W.R.T. A. WE ASSUME THAT THE SPACECRAFT WILL EXECUTE 2 TRANSLATIONS TO MOVE ONE IMAGE ON TOP OF THE OTHER, I.E., NO CHANGE IN ROLL). WE WILL GET THE POLARIZATION USING STRATEGY 2C IN THE WFPC2 INSTRUMENT SCIENCE REPORT 95-01 IN ONE VISIT. ??????OPEN QUESTIONS AT THIS TIME??????: I) IS THE DEFINITION OF THE OFFSETS IN THE HANDBOOK CORRECT AND HAVE WE APPLIED IT CORRECTLY? WE CANNOT AFFORD ANY SIGN ERRORS HOWEVER, THE NON-OPTIMAL POLARIZER LOCATIONS WILL RESULT IN CORRELATED ERRORS, SO WE ALSO USE STRATEGY 2B, WHICH INVOLVES SPACE- CRAFT ROLLS. ALSO, IMMEDIATELY AFTER VISIT 1, WE OBTAIN OBSERVATIONS OF A PSF STAR. THIS WILL ALLOW US TO PERFORM ACCURATE PHOTOMETRY OF THE 4 COMPONENTS. THE PSF STAR IS OBSERVED THROUGH ALL THE POLARIZERS AS WELL, TO ALLOW US TO CHARACTERIZE THE PSF THROUGH THE POLARIZER FILTERS. 2) TO ADDRESS THE VARIABILITY, WE ALWAYS TAKE (DITHERED) DIRECT IMAGES IN EACH VISIT AS WELL. WE ARE NOW CONCERNED ABOUT VARIABILITY, HAVING HEARD ABOUT NEW KECK RESULTS ON THE CLOVERLEAF. WE SPEND THE FIRST 10 ORBITS OF THIS PROPOSAL TO GET THE BEST MEASUREMENTS POSSIBLE. WE PUT THE REMAINING 6 ORBITS ON HOLD. AFTER HAVING SEEN WHAT THE FIRST SET OF DATA SHOWED, WE MAY EITHER DECIDE TO USE THE REMAINING 6 ORBITS WITH THE STRATEGY OUTLINED IN THIS PROPOSAL, AND DO IT ASAP, OR WE MAY DECIDE TO USE A DIFFERENT STRATEGY. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQ -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQP15 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN18 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 6 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 7 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN33 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 8 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 9 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQ -12.5 ET ------------------------------------------------------------------------------------------------------------------------------------ 10 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQP15 -12.5 ET ------------------------------------------------------------------------------------------------------------------------------------ 11 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN18 -12.5 ET ------------------------------------------------------------------------------------------------------------------------------------ 12 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN33 -12.5 ET ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 8] Visit: 04 Visit Requirements: ORIENTation 2D TO 4D FROM 3 SCHEDulability 100% On Hold Comments: Additional Comments: WE USE THE POLFILTER AND ORIENT COMBINATION OF STRATEGY 2B TO GET A MEASUREMENT OF THE CLOVER AT A RELATIVE POLARIZER ORIENTATION OF 120D FROM THE FIRST OBSERVATION. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN18 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN18 -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 9] Visit: 05 Visit Requirements: ORIENTation -43D TO -41D FROM 6 SCHEDulability 100% ON HOLD On Hold Comments: CONTACT PI BEFORE SCHEDULING VISITS 5-7, PLEASE. Additional Comments: WE USE THE POLFILTER AND ORIENT COMBINATION OF STRATEGY 2B TO GET A MEASUREMENT OF THE CLOVER AT A RELATIVE POLARIZER ORIENTATION OF 60D FROM THE FIRST OBSERVATION. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN33 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN33 -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 10] Visit: 06 Visit Requirements: SCHEDulability 100% SEQ 5-7 WITHIN 48H ON HOLD On Hold Comments: CONTACT PI BEFORE SCHEDULING VISITS 5-7, PLEASE. Additional Comments: WE USE THE POLFILTER AND ORIENT COMBINATION OF STRATEGY 2B TO GET A MEASUREMENT OF THE CLOVER AT A RELATIVE POLARIZER ORIENTATION OF 60D FROM THE FIRST OBSERVATION. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQ -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQ -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 11] Visit: 07 Visit Requirements: ORIENTation 2D TO 4D FROM 6 SCHEDulability 100% ON HOLD On Hold Comments: CONTACT PI BEFORE SCHEDULING VISITS 5-7, PLEASE. Additional Comments: WE USE THE POLFILTER AND ORIENT COMBINATION OF STRATEGY 2B TO GET A MEASUREMENT OF THE CLOVER AT A RELATIVE POLARIZER ORIENTATION OF 120D FROM THE FIRST OBSERVATION. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A POLQN18 -12.5 ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+1143- WFPC2 IMAGE PC1 F702W 1 70 S COMP-A ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+1143- WFPC2 IMAGE WF2-FIX F555W DITHER-TYPE=BOX 1 40 S POSition TARGet +12.5, COMP-A-OFFS -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+1143- WFPC2 IMAGE WF2-FIX F555W, DITHER-TYPE=BOX 1 100 S POSition TARGet +12.5, COMP-A-OFFS POLQN18 -12.5 ET Comments: THE OBS. ARE REPEATED WITH COMPONENTS D AND A REVERSED. THE ROLL MUST NOT CHANGE (OFFSETTING SHOULD NOT CHANGE THE ROLL). THE OFFSETTED OBS. MUST PLACE COMPONENT D ON THE SAME PIXEL WHERE A WAS. ------------------------------------------------------------------------------------------------------------------------------------ 6815( 21) - 08/01/97 11:08 - [ 12] Summary Form for Proposal 6815 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DITHER-TYPE=BOX ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QSO ABSORPTION LINES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHEDulability 100% AFTER 2 BY 1D TO 30D POSition TARGet +12.5,-12.5 ORIENTation -43D TO -41D FROM 3 SCHEDulability 100% SCHEDulability 100% GROUP 2-4 WITHIN 48H ORIENTation 2D TO 4D FROM 3 SCHEDulability 100% ORIENTation -43D TO -41D FROM 6 SCHEDulability 100% ON HOLD SCHEDulability 100% SEQ 5-7 WITHIN 48H ON HOLD ORIENTation 2D TO 4D FROM 6 SCHEDulability 100% ON HOLD ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F555W,POLQ F555W,POLQP15 F555W,POLQN18 F555W,POLQN33 F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names G191B2B H1413+1143-COMP-A H1413+1143-COMP-A-OFFSET ------------------------------------------------------------------------------------------------------------------------------------