15769( 2) - 14-Aug-2019 20:03:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15769 Version: 2 Check-in Time: 14-Aug-2019 20:03:54 STScI Edit Number: 0 Title ACS Postflash Calibration ------------------------------------------------------------------------------------ Type Cycle CAL/ACS 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Nathan Miles Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract This program will be used to create the yearly post-flash calibration reference image. It contains 6 exposure pairs with a post-flash level of 4774 and 63 electrons at a fixed DARKTIME (EXPTIME + FLASHDUR + COMMANDING). ------------------------------------------------------------------------------------ Observations Description ------------------------ This internal program will take 6 pairs of short- and long-flashed darks to generate an annual post-flash reference file. The short flashed frames will have an exptime of 337 seconds and a post-flash level of 63 electrons (4.5 seconds), whereas the long flashed frames will have an exptime of 0.5 seconds and a post-flash level of 4774 electrons (341 seconds). A post-flash level of 4774 electrons is 959 electrons below the highest possible level allowed in APT and will permit the parallelization of exposures and buffer dumps optimizing the required number of internal orbits. ------------- Calibration Justification ------------- We follow the same observing scheme from the previous year by taking short and long pairs of darks where the sum of the EXPTIME and FLASHDUR keywords is held fixed. The data for this program will be used to gerenate the yearly post-flash reference file. ------------- Additional Comments ------------- We would prefer the observations to be scheduled in November/December. The exposures should be taken all within the same WFC anneal period, and the GROUP-WITHIN ensures that the WFC hot pixels will not have changed significantly through the exposure sequence. ------------------------------------------------------------------------------------ 15769( 2) - 14-Aug-2019 20:03:54 - [ 2] Visit: 01 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; GROUP 01, 02, 03, 04, 05, 06 WITHIN 3D; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 3] Visit: 02 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 4] Visit: 03 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 5] Visit: 04 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 6] Visit: 05 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 7] Visit: 06 Visit Requirements: BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00; VISIBILITY INTERVAL 1800 S On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK ACS/WFC ACCUM WFC DEF FLASH=4774 1 0.5 S (0.5 SEQ 1-2 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK ACS/WFC ACCUM WFC DEF FLASH=63 1 337 S (337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 ACS/WFC ACCUM WFC DEF none none none none 1 N/A DARK 2 ACS/WFC ACCUM WFC DEF none none none none 1 N/A 15769( 2) - 14-Aug-2019 20:03:54 - [ 8] Summary Form for Proposal 15769 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=4774, FLASH=63 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-NOV-2019:00:00:00 AND 31-DEC-2019:00:00:00, GROUP 01, 02, 03, 04, 05, 06 WITHIN 3D, SEQ 1-2 NON-INT, VISIBILITY INTERVAL 1800 S ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF ------------------------------------------------------------------------------------------------------------------------------------ Target Names DARK ------------------------------------------------------------------------------------------------------------------------------------