12385( 4) - 06-Apr-2011 12:39:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12385 Version: 4 Check-in Time: 06-Apr-2011 12:39:20 STScI Edit Number: 0 Title External CTE Monitor ------------------------------------------------------------------------------------ Type Cycle CAL/ACS 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Marco Chiaberge Space Telescope Science Institute CoI: Ms. Pey Lian Lim Space Telescope Science Institute N CoI: Dr. Norman Grogin Space Telescope Science Institute N CoI: Mr. Ray Lucas Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract This program will obtain a direct calibration of photometric losses due to imperfect CTE by imaging stars in 47 Tuc. Since the pixel-based CTE correction (Anderson & Bedin 2010) has been shown to be consistent with the photometric correction formula (Chiaberge et al. ACS/ISR 2009-01), this program will be used to track the time dependence of the pixel based correction. One field with extended sources is also imaged to study the effect of CTE on galaxy shapes. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observations of 47 Tuc with half-FOV sized dithers, various filters, and exposure times are used to achieve different background levels to characterize impact of CTE on photometry. For each pointing we will obtain 2 CR-SPLITs to allow cosmic ray rejection and provide a set of ?clean? stars for the analysis of CTE effects on photometry. More specifically, since the CTE also depends on the background level, we will obtain 5 different background levels, using the F502N and F606W filters and different exposure times, from 30s to 400s per exposure. In this way, we will obtain background levels ranging from ~0 to ~50 e-/pixel. Thus the total number of exposures is 5 (bkg levels) x2 (CR-SPLIT) x 3 (positions on the sky) = 30. Since it is crucial to obtain an almost constant sky level, we will request ?low sky?. Four to five images can be done each orbit so the total orbit request is 8 orbit. One field in the GOODS area will be imaged with the same technique in one orbit, in order to study the effects of CTE on the shape of faint galaxies. The target is a field that has been observed in the past (since 2002) at different orientations in order to allow study of the time dependence. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments 12385( 4) - 06-Apr-2011 12:39:20 - [ 2] ------------------- ------------------------------------------------------------------------------------ 12385( 4) - 06-Apr-2011 12:39:20 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC104 STELLAR CLUSTER, RA=00H22M38.2500S +/- 1", J2000 V = 17.5 +/- 0.1 GLOBULAR CLUSTER DEC=-72D03'54.00" +/- 1" Reference Frame: ICRS Comments: Field 6' W of cluster centre. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0 0 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 HDF-NORTH-GO GALAXY, HIGH REDSHIFT RA=12H36M54.8690S +/- 0.1", J2000 V = 25 ODS-TILE-NOR GALAXY DEC=+62D14'19.18" +/- 0.1" M-8 Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12385( 4) - 06-Apr-2011 12:39:20 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 1.003 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 12385( 4) - 06-Apr-2011 12:39:20 - [ 5] Visit: 01 Visit Requirements: BEFORE 01-FEB-2011:00:00:00 On Hold Comments: Additional Comments: USE SINGLE GUIDE STAR IF NECESSARY.VISIT SHOULD USE CONTIGUOUS ORBITS DO NO BREAK ORBITS Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 60.0 S POS TARG 101.17, 8.19; LOW-SKY; SAME OBSET 1-7; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 800.0 S POS TARG 101.17, 8.19; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=NO 1 30.0 S POS TARG 0.0, 0.0; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=NO 1 30.0 S POS TARG 0.0, 0.0; LOW-SKY; SEQ 4-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 800.0 S POS TARG 0.0, 103.64; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 60.0 S POS TARG 0.0, 103.64; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 800.0 S POS TARG 0.0, 0.0; LOW-SKY; SEQ 7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC104 1 ACS/WFC ACCUM WFC F502N none none none 1 1 N/A NGC104 1 ACS/WFC ACCUM WFC F502N none none none 2 1 N/A NGC104 2 ACS/WFC ACCUM WFC F606W none none none 1 1 N/A NGC104 2 ACS/WFC ACCUM WFC F606W none none none 2 1 N/A NGC104 3 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC104 4 ACS/WFC ACCUM WFC F502N none none none none 2 N/A NGC104 5 ACS/WFC ACCUM WFC F606W none none none 1 2 N/A NGC104 5 ACS/WFC ACCUM WFC F606W none none none 2 2 N/A NGC104 6 ACS/WFC ACCUM WFC F502N none none none 1 2 N/A NGC104 6 ACS/WFC ACCUM WFC F502N none none none 2 2 N/A NGC104 7 ACS/WFC ACCUM WFC F606W none none none 1 3 N/A NGC104 7 ACS/WFC ACCUM WFC F606W none none none 2 3 N/A 12385( 4) - 06-Apr-2011 12:39:20 - [ 6] Visit: 02 Visit Requirements: AFTER 01 BY 2.8 Orbits TO 3.2 Orbits On Hold Comments: Additional Comments: USE SINGLE GUIDE STAR IF NECESSARY.VISIT SHOULD USE CONTIGUOUS ORBITS DO NO BREAK ORBITS Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 80.0 S POS TARG 101.17, 8.19; LOW-SKY; SAME OBSET 1-7; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 720.0 S POS TARG 101.17, 8.19; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=NO 1 40.0 S POS TARG 0.0, 0.0; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=NO 1 40.0 S POS TARG 0.0, 0.0; LOW-SKY; SEQ 4-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 720.0 S POS TARG 0.0, 0.0; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 80.0 S POS TARG 0.0, 103.64; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC104 ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 720.0 S POS TARG 0.0, 103.64; LOW-SKY; SEQ 7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC104 1 ACS/WFC ACCUM WFC F606W none none none 1 1 N/A NGC104 1 ACS/WFC ACCUM WFC F606W none none none 2 1 N/A NGC104 2 ACS/WFC ACCUM WFC F502N none none none 1 1 N/A NGC104 2 ACS/WFC ACCUM WFC F502N none none none 2 1 N/A NGC104 3 ACS/WFC ACCUM WFC F606W none none none none 1 N/A NGC104 4 ACS/WFC ACCUM WFC F606W none none none none 2 N/A NGC104 5 ACS/WFC ACCUM WFC F502N none none none 1 2 N/A NGC104 5 ACS/WFC ACCUM WFC F502N none none none 2 2 N/A NGC104 6 ACS/WFC ACCUM WFC F606W none none none 1 2 N/A NGC104 6 ACS/WFC ACCUM WFC F606W none none none 2 2 N/A NGC104 7 ACS/WFC ACCUM WFC F502N none none none 1 3 N/A NGC104 7 ACS/WFC ACCUM WFC F502N none none none 2 3 N/A 12385( 4) - 06-Apr-2011 12:39:20 - [ 7] Visit: 03 Visit Requirements: AFTER 02 BY 2.8 Orbits TO 3.2 Orbits On Hold Comments: Additional Comments: USE SINGLE GUIDE STAR IF NECESSARY.VISIT SHOULD USE CONTIGUOUS ORBITS DO NO BREAK ORBITS Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 300.0 S POS TARG 101.17, 8.19; LOW-SKY; SAME OBSET 1-3; SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 300.0 S POS TARG 0.0, 0.0; LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC104 ACS/WFC ACCUM WFC F606W CR-SPLIT=2 1 300.0 S POS TARG 0.0, 103.64; LOW-SKY; SEQ 3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC104 1 ACS/WFC ACCUM WFC F606W none none none 1 1 N/A NGC104 1 ACS/WFC ACCUM WFC F606W none none none 2 1 N/A NGC104 2 ACS/WFC ACCUM WFC F606W none none none 1 1 N/A NGC104 2 ACS/WFC ACCUM WFC F606W none none none 2 1 N/A NGC104 3 ACS/WFC ACCUM WFC F606W none none none 1 2 N/A NGC104 3 ACS/WFC ACCUM WFC F606W none none none 2 2 N/A 12385( 4) - 06-Apr-2011 12:39:20 - [ 8] Visit: 04 Visit Requirements: BRIGHT EARTH AVOID 25D; ORIENT 135D TO 135 D On Hold Comments: Additional Comments: USE SINGLE GUIDE STAR IF NECESSARY. DO NOT BREAK THE ORBIT Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HDF-NORTH-G ACS/WFC ACCUM WFC F850LP 1 550.0 S POS TARG 0.0, 0.0; SAME OODS-TILE-N OBSET 1-2; SEQ 1 ORM-8 NON-INT; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 HDF-NORTH-G ACS/WFC ACCUM WFC F850LP 1 550.0 S POS TARG 0.0, -103.64; OODS-TILE-N SEQ 2 NON-INT; PATTERN 2 ORM-8 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HDF-NORTH-GOODS-TIL 1 ACS/WFC ACCUM WFC F850LP 1 none none none 1 N/A E-NORM-8 HDF-NORTH-GOODS-TIL 1 ACS/WFC ACCUM WFC F850LP 2 none none none 1 N/A E-NORM-8 HDF-NORTH-GOODS-TIL 2 ACS/WFC ACCUM WFC F850LP 1 none none none 1 N/A E-NORM-8 HDF-NORTH-GOODS-TIL 2 ACS/WFC ACCUM WFC F850LP 2 none none none 1 N/A E-NORM-8 12385( 4) - 06-Apr-2011 12:39:20 - [ 9] Summary Form for Proposal 12385 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 2.8 Orbits TO 3.2 Orbits, AFTER 02 BY 2.8 Orbits TO 3.2 Orbits, BEFORE 01-FEB-2011:00:00:00, BRIGHT EARTH AVOID 25D, LOW-SKY, ORIENT 135D TO 135 D, PATTERN 2 1, PATTERN 2 2, POS TARG 0.0, -103.64, POS TARG 0.0, 0.0, POS TARG 0.0, 103.64, POS TARG 101.17, 8.19, SAME OBSET 1-2, SAME OBSET 1-3, SAME OBSET 1-7, SEQ 1 NON-INT, SEQ 1-2 NON-INT, SEQ 1-3 NON-INT, SEQ 2 NON-INT, SEQ 3 NON-INT, SEQ 4-6 NON-INT, SEQ 7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N, F606W, F850LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names HDF-NORTH-GOODS-TILE-NORM-8, NGC104 ------------------------------------------------------------------------------------------------------------------------------------