16762( 4) - 26-Apr-2022 20:34:35 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16762 Version: 4 Check-in Time: 26-Apr-2022 20:34:35 STScI Edit Number: 0 Title Probing the Origins of BST1047+1156, the Most Diffuse Star Forming Galaxy ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Chris Mihos Case Western Reserve University Y CoI: Dr. Patrick R. Durrell Youngstown State University Y CoI: Prof. Stacy S. McGaugh Case Western Reserve University N CoI: Dr. John J. Feldmeier Youngstown State University N CoI: Dr. Aaron Emery Watkins University of Hertfordshire N ------------------------------------------------------------------------------------ Abstract The recently discovered galaxy BST 1047+1156 is the most diffuse star-forming galaxy found to date. Located in the Leo I galaxy group (D=11 Mpc), its extremely diffuse nature tests models of both galaxy formation and star formation at the lowest densities. BST1047's extraordinarily blue optical colors and UV emission both signal a recent episode of star formation in the object, even though its HI column density is well below that in which star formation typically occurs. Exactly how BST1047 formed remains unclear: it may be either a long-lived but extremely diffuse LSB galaxy caught in a tidal interaction, or a recently spawned tidal dwarf caught in the throes of disruption. Either scenario places BST1047 at the extreme limits of our understanding of galaxy evolution processes. To resolve the question of BST1047's origins, we propose deep F606W/F814W imaging to construct a color magnitude diagram of its resolved stellar population and constrain the ages and metallicities of its stars. This will cleanly differentiate between the two formation scenarios, as the presence of old red giant branch stars would rule out the young tidal dwarf model. A purely young stellar population would mark BST1047 as a disrupting tidal dwarf, the first such object known, providing a new link between tidal interactions and dwarf galaxy formation and disruption. We will also place BST1047 on the well-determined stellar mass-metallicity relationship for normal star forming galaxies, providing another important test of its origins. Finally, we will use the BST1047's populations to probe the spatial distribution of recent and past star formation in this anomolous object. ------------------------------------------------------------------------------------ Observations Description ------------------------ The program is to obtain very deep F606W and F814W images of a small, diffuse galaxy near M96. Our goal is to obtain photometry of point sources over the entire FOV, although the target galaxy is small enough that it will fit within a single ACS chip. We are using ACS as primary to get the larger FOV on the target galaxy, and WFC3 in parallel to obtain a 'background' field necessary for our science goals. LOW-SKY is required due to the higher-than-average sky background for targets near the ecliptic plane, and our need to get high enough S/N for very faint point sources. 16762( 4) - 26-Apr-2022 20:34:35 - [ 2] Exposure Times: We are using 2 images per orbit to maximize S/N and to avoid issues with unequal exposure times and buffer dumps when taking 4 LOW-SKY images per orbit. While the images will have correspondingly more CRs, there will be 14 or 16 images in each filter, so many images from which to effectively reject CRs. Aperture: We are using the WFC1 aperture - the object is small (but extended), we want to make sure we sample the region immediately surrounding the object. Thus, we are NOT requesting WFC1-FIX or WFC1-CTE. Visit Locations: The program is split into 7 two orbits visits and one single orbit visit to maximize schedulability: 8 orbits for F606W and 7 for F814W for the primary ACS exposures; the parallel WFC3 images will flip the orbit allocations for the same filters. For each 2-orbit visit, we use a small custom subpixel 4 pt ACS-WFC-DITHER-BOX pattern to sample the PSF in both cameras. Between visits, POS-TARGs are used to create a slightly larger (20 pixel) BOX pattern to keep the sub-pixel dithers comparable over the entire FOV -- we do NOT need to cover the chip gap. (If 20 pixels is too large a pattern we could consider something smaller, but stil larger than the 4-point dither above) The final Visit will use a custom DITHER-LINE to match the first two points of the small, subpixel DITHER-BOX pattern. ORIENT: We are requesting ORIENT angles between 90 and 130 degrees, so that (a) the WFC3 parallel is roughly the same distance from M96 at the ACS field (sampling the contaminating M96 halo stars, and (b) the restricted roll angles will keep the WFC3 parallel field from overlapping two rather bright stars. These limits keep the western bright star over 30" from the WFC3 FOV to avoid 'dragon's breath' Fortunately, this ORIENT range covers the majority of schedulable days, so this choice should have very little impact on the ability to schedule. Reduced Gyro Mode: We are relatively flexible in roll angle and targeting, so if such adjustments need to be made in Reduced Gyro Mode, we can accommodate these (few percent reduction in exposures, changing apertures for guide star acquisition) with little difficulty, The loss of entire orbits, however, would make our project very difficult to execute. Past experience with single guide star guiding resulted in significant image quality degradation, so if we needed to operate under these conditions, our project goals could be difficult to achieve. Pre-Flash: Due to the relatively long exposures (2 images per orbit for each camera), the wide-passbands, and the relatively high sky background (near the ecliptic), we expect WFC3 sky backgrounds of at least 30 e- (assuming a faintest possible sky of MU_V=22.5), so well above the 20e- threshold below which a pre-flash would be required. No pre-flash is required for any of our exposures. ------------------------------------------------------------------------------------ 16762( 4) - 26-Apr-2022 20:34:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 BST1047+1156 EXT-CLUSTER, STAR RA=10H47M43.8000S, J2000 V = 26.0 FORMING REGION DEC=+11D56'1.00" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 16762( 4) - 26-Apr-2022 20:34:35 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.262 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.265 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16762( 4) - 26-Apr-2022 20:34:35 - [ 5] Visit: 01 (BST1054 - F606W orbits 1-2) Visit Requirements: ORIENT 90D TO 130 D On Hold Comments: Additional Comments: Visit 1 - first two orbits with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG 0., 0.; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 6] Visit: 02 (BST1054 - F606W orbits 3-4) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 2 - orbits 3-4 s with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG -0.98, 0.00; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 7] Visit: 03 (BST1054 - F606W orbits 5-6) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 2 - orbits 5-6 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG 0, -0.98; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 8] Visit: 04 (BST1054 - F606W orbits 7-8) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 4 - final (of 4) pair of orbits with ACS+606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG -0.98, -0.98; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 9] Visit: 05 (BST1054 - F814W orbits 1-2) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 5 -first pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F814W observations. 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 BST1047+115 ACS/WFC ACCUM WFC1 F814W 1 1185 S POS TARG 0, 0; LOW-SKY; 6 (4740 S) PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F606W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 10] Visit: 06 (BST1054 - F814W orbits 3-4) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 6 -second pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 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 BST1047+115 ACS/WFC ACCUM WFC1 F814W 1 1185 S POS TARG -0.98, 0.00; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F606W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 11] Visit: 07 (BST1054 - F814W orbits 5-6) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 7 -third pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 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 BST1047+115 ACS/WFC ACCUM WFC1 F814W 1 1185 S POS TARG 0.00, -0.98; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F606W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 12] Visit: 08 (BST1054 - F814W orbit 7) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 5 -single orbit with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 2 point dither line pattern (mimicing half of dither-box used in previous visits) to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 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 BST1047+115 ACS/WFC ACCUM WFC1 F814W 1 1185 S POS TARG -0.98, -0.98; 6 (2370 S) LOW-SKY; PATTERN 2 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F606W 1 1250 S 6 S ER (2500 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 13] Visit: 09 (BST1054 - F606W orbits 3-4) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 9 (repeat observation of failed Visit 02) - orbits 3-4 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG -0.98, 0.00; 6 (4740 S) LOW-SKY; PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (5000 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 3 none none none 2 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 4 none none none 2 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 14] Visit: 10 (BST1054 - F606W orbit 3) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Visit 02/09 repeat - orbit 3 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are matched to exposure 1&2 in a 4 point subpixel dither box pattern to overcome bad/hot pixels 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 BST1047+115 ACS/WFC ACCUM WFC1 F606W 1 1185 S POS TARG -0.98, 0.0; 6 (2370 S) LOW-SKY; PATTERN 3 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 BST1047+115 WFC3/UVI ACCUM UVIS-CENT F814W 1 1250 S 6 S ER (2500 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 | ------------------------------------------------------------------------------------------------------------------------------------ BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 N/A BST1047+1156 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 N/A BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 1 N/A S TER BST1047+1156 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 1 N/A S TER 16762( 4) - 26-Apr-2022 20:34:35 - [ 15] Summary Form for Proposal 16762 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements LOW-SKY, ORIENT 90D TO 130 D, PAR 2 WITH 1, PATTERN 1 1-2, PATTERN 2 1-2, PATTERN 3 1-2, POS TARG -0.98, -0.98, POS TARG -0.98, 0.0, POS TARG -0.98, 0.00, POS TARG 0, -0.98, POS TARG 0, 0, POS TARG 0., 0., POS TARG 0.00, -0.98, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names BST1047+1156 ------------------------------------------------------------------------------------------------------------------------------------