17360( 2) - 20-Jul-2023 20:25:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17360 Version: 2 Check-in Time: 20-Jul-2023 20:25:54 STScI Edit Number: 0 Title WFC3 UVIS Shutter Monitoring ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Ky Huynh Space Telescope Science Institute Y CoI: Dr. Sylvia M. Baggett Space Telescope Science Institute Y CoI: Dr. Annalisa Calamida Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract We monitor the WFC3 UVIS shutter performance. The exposures in F555W need to be identical to previous cycles. Images with exposure times ranging from 0.5 to 17 seconds will be used to compare the photometric behavior of each shutter blade, for short vs long exposures and check for shutter shading effects. The first exposure of 0.5sec cannot be used since the lamp would be still heating during this exposure, so we will take a set of three 0.5sec exposures. Internal flats in each of the 4 amps will be used to monitor the repeatability and shutter shading effects. We want to include some wavelength dependence, so this proposal now includes exposures in F814W filter, exposure times for which have been estimated using information from WFC3 ISR 2008-21. ------------------------------------------------------------------------------------ Observations Description ------------------------ Seven Full-frame internal flat field images are collected twice in two different visits, one using F555W and another in F814W using the default tungsten lamp with exposure times of 0.5, 1.0, and 17.0 seconds in order to monitor the shutter and test wavelength dependence. Pairs of flat field images are collected for each exposure time; one using shutter A and another using shutter B. An additional 0.5 exposure is used to heat up the tungsten lamp. ------------------------------------------------------------------------------------ 17360( 2) - 20-Jul-2023 20:25:54 - [ 2] Visit: 01 Visit Requirements: BETWEEN 01-JUL-2023 AND 01-APR-2024 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 TUNGSTEN WFC3/UVI ACCUM UVIS F555W 3 0.5 S (1.5 S S) Comments: This assumes Tungsten lamp 3. (2800 e-/sec/pix through F555W in TV3 testing) ------------------------------------------------------------------------------------------------------------------------------------ 2 TUNGSTEN WFC3/UVI ACCUM UVIS F555W 2 1.0 S (2 S S) Comments: This assumes Tungsten lamp 3. (2800 e-/sec/pix through F555W in TV3 testing) ------------------------------------------------------------------------------------------------------------------------------------ 3 TUNGSTEN WFC3/UVI ACCUM UVIS F555W 2 17 S (34 S S) Comments: This assumes Tungsten lamp 3. (2800 e-/sec/pix through F555W in TV3 testing) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TUNGSTEN 1 WFC3/UVI ACCUM UVIS F555W none none 1 none 1 N/A S TUNGSTEN 1 WFC3/UVI ACCUM UVIS F555W none none 2 none 1 N/A S TUNGSTEN 1 WFC3/UVI ACCUM UVIS F555W none none 3 none 1 N/A S TUNGSTEN 2 WFC3/UVI ACCUM UVIS F555W none none 1 none 1 N/A S TUNGSTEN 2 WFC3/UVI ACCUM UVIS F555W none none 2 none 1 N/A S TUNGSTEN 3 WFC3/UVI ACCUM UVIS F555W none none 1 none 1 N/A S TUNGSTEN 3 WFC3/UVI ACCUM UVIS F555W none none 2 none 1 N/A S 17360( 2) - 20-Jul-2023 20:25:54 - [ 3] Visit: 02 Visit Requirements: BETWEEN 01-MAR-2024 AND 31-DEC-2024 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 TUNGSTEN WFC3/UVI ACCUM UVIS F814W 3 0.5 S (1.5 S S) Comments: This assumes Tungsten lamp 3. (20, 000 e-/sec/pix through F814W, WFC3 ISR 2008-21) ------------------------------------------------------------------------------------------------------------------------------------ 2 TUNGSTEN WFC3/UVI ACCUM UVIS F814W 2 1 S (2 S) S ------------------------------------------------------------------------------------------------------------------------------------ 3 TUNGSTEN WFC3/UVI ACCUM UVIS F814W 2 2 S (4 S) S Comments: This assumes Tungsten lamp 3. (20, 000 e-/sec/pix through F814W, WFC3 ISR 2008-21) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TUNGSTEN 1 WFC3/UVI ACCUM UVIS F814W none none 1 none 1 N/A S TUNGSTEN 1 WFC3/UVI ACCUM UVIS F814W none none 2 none 1 N/A S TUNGSTEN 1 WFC3/UVI ACCUM UVIS F814W none none 3 none 1 N/A S TUNGSTEN 2 WFC3/UVI ACCUM UVIS F814W none none 1 none 1 N/A S TUNGSTEN 2 WFC3/UVI ACCUM UVIS F814W none none 2 none 1 N/A S TUNGSTEN 3 WFC3/UVI ACCUM UVIS F814W none none 1 none 1 N/A S TUNGSTEN 3 WFC3/UVI ACCUM UVIS F814W none none 2 none 1 N/A S 17360( 2) - 20-Jul-2023 20:25:54 - [ 4] Summary Form for Proposal 17360 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-JUL-2023 AND 01-APR-2024, BETWEEN 01-MAR-2024 AND 31-DEC-2024 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names TUNGSTEN ------------------------------------------------------------------------------------------------------------------------------------