15911( 5) - 17-Sep-2020 15:44:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15911 Version: 5 Check-in Time: 17-Sep-2020 15:44:06 STScI Edit Number: 2 Title Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Andres del Pino Molina Space Telescope Science Institute Y CoI: Dr. Sangmo Tony Sohn Space Telescope Science Institute N CoI: Dr. Mark Fardal Space Telescope Science Institute N CoI: Dr. Roeland P. van der Marel Space Telescope Science Institute N CoI: Ms. Ekta Patel University of Arizona N CoI: Dr. Gurtina Besla University of Arizona N CoI: Dr. Laura L. Watkins Space Telescope Science Institute - ESA N CoI: Dr. Elena Sacchi Space Telescope Science Institute N CoI: Dr. Erik Tollerud Space Telescope Science Institute N CoI: Dr. Antonio Aparicio Instituto de Astrofisica de Canarias N CoI: Dr. Carme Gallart Instituto de Astrofisica de Canarias N CoI: Dr. Matteo Monelli Instituto de Astrofisica de Canarias N ------------------------------------------------------------------------------------ Abstract Dwarf galaxies are excellent test particles for studying dynamical properties of the Local Group (LG) and the role of environment in quenching of star formation in low-mass galaxies. In this context, galaxies at the edge of the LG are of particular interest. They enable an estimate of the mass of the LG throught the radius of the turn-around surface. However, how dwarfs can be located at such large distances from the barycenter of the LG is still an open question. It may be that these galaxies are on their first infall into the LG potential well. Alternatively, they may have been close to their first orbital apocenter when the LG decoupled from the Hubble flow, the so-called splashback radius. Depending on this issue, the enviroment the dwarfs have moved through can be quite different. This environment also affects their star formation history through e.g. quenching. Here we propose to measure proper motions (PM) 4 dwarfs located at the edge of the LG: 2 dwarf irregulars (LeoA and Sag dIrr) and 2 dwarf spheroidals (Cetus and Tucana). These are the only dwarfs at the edge of the Local Group with first epoch archival data for PM measurements and star formation history determination. We will construct full three-dimensional velocity vectors, trace back their orbits, calculate the LG Mass, and determine whether past interactions with the MW or M31 can explain their different morphologies and star-formation histories. ------------------------------------------------------------------------------------ Observations Description ------------------------ The main goal of this program is to measure absolute proper motions of the four target galaxies CETUS-DSPH, LEOA-DIRR, TUCANA-DSPH, and SAG-DIRR dwarf galaxies. For this, we will use compact background galaxies in the field view as stationary reference sources. The target galaxies have already been observed in two separate epochs: the first epoch in 2003-2006, and the second epoch in 2011. The imaging data from this program will add another epoch thereby 15911( 5) - 17-Sep-2020 15:44:06 - [ 2] extending the time baseline from 5-8 to 14-17 years. For the proper motion measurements, we will measure the average motion of stars in each dwarf galaxy with respect to compact background galaxies using the multi-epoch data. Our analysis techniques and expected accuracies are described in the Phase I proposal. The first epoch ACS/WFC data were obtained in at least two filters to make deep color magnitude diagrams for the target galaxies. The available broad-band colors and depth are sufficient for separating stars, foreground stars, and background galaxies to first order. For the current program, we will observe each target galaxy with the F814W filter using the same pointing and orientation used for the first-epoch data. We therefore added Visit Orient Requirements to all visits. Individual exposures will be sub-pixel dithered and will last half an orbit. We will use customized dither patterns designed to maximize the pixel phase coverage via the POSTARG requirements. We request CETUS-DSPH, LEOA-DIRR, and TUCANA-DSPH to be each observed in a single visit with 4 orbits. For SAG-DIRR, we request two visits (each lasting 4 orbits) with Tminig Requirements "GROUP WITHIN 30D" so that they can be treated as single epoch data for astrometric analyses. ------------------------------------------------------------------------------------ 15911( 5) - 17-Sep-2020 15:44:06 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CETUS-DSPH GALAXY, DWARF RA=00H26M9.6193S, J2000 V = 13.2 SPHEROIDAL DEC=-11D04'33.95" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 LEOA-DIRR GALAXY, DWARF RA=09H59M24.7256S, J2000 V = 12.4 SPHEROIDAL DEC=+30D45'20.38" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 TUCANA-DSPH GALAXY, DWARF RA=22H41M48.1023S, J2000 V = 15.2 SPHEROIDAL DEC=-64D25'15.34" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 SAG-DIRR GALAXY, DWARF RA=19H29M59.2059S, J2000 V = 13.6 SPHEROIDAL DEC=-17D40'46.83" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15911( 5) - 17-Sep-2020 15:44:06 - [ 4] Visit: 01 (CETUS) Visit Requirements: ORIENT 266.015D TO 266.015 D On Hold Comments: Additional Comments: This is the visit for imaging the Cetus dwarf spheroidal galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of programs GO-10505 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POS-TARG special requirements. We will do a set of 8-point dithering. 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 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1219 S POS TARG 0.0000, 0.0000; (1219 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1219 S POS TARG 0.1740, 0.2350 (1219 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1275 S POS TARG 0.3232, 0.1235; (1275 S) SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1276 S POS TARG 0.1005, 0.3305 (1276 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1275 S POS TARG 0.5075, 0.0505; (1275 S) SEQ 5-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1276 S POS TARG 0.6815, 0.2855 (1276 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1275 S POS TARG 0.8300, 0.1735; (1275 S) SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8 CETUS-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1276 S POS TARG 0.6080, 0.3810 (1276 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 | ------------------------------------------------------------------------------------------------------------------------------------ CETUS-DSPH 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A CETUS-DSPH 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A CETUS-DSPH 3 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A CETUS-DSPH 4 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A CETUS-DSPH 5 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A CETUS-DSPH 6 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A CETUS-DSPH 7 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A CETUS-DSPH 8 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 5] Visit: 02 (LEOA-DIRR) Visit Requirements: ORIENT 283.239D TO 283.239 D On Hold Comments: Additional Comments: This is the visit for imaging the Leo A dwarf irregular galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of PID 10505 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POS-TARG special requirements. We will do a set of 8-point dithering. 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 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1234 S POS TARG 0.0000, 0.0000; (1234 S) GS ACQ SCENARIO BASE1B3; SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1235 S POS TARG 0.1740, 0.2350 (1235 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.3232, 0.1235; (1291 S) SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.1005, 0.3305 (1291 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.5075, 0.0505; (1291 S) SEQ 5-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.6815, 0.2855 (1291 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.8300, 0.1735; (1291 S) SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8 LEOA-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1291 S POS TARG 0.6080, 0.3810 (1291 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEOA-DIRR 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A LEOA-DIRR 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A LEOA-DIRR 3 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A LEOA-DIRR 4 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A LEOA-DIRR 5 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A LEOA-DIRR 6 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A LEOA-DIRR 7 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEOA-DIRR 8 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 7] Visit: 03 (TUCANA-DSPH) Visit Requirements: ORIENT 231.554D TO 231.554 D On Hold Comments: Additional Comments: This is the visit for imaging the Tucana dwarf spheroidal galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of PID 10505 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POS-TARG special requirements. We will do a set of 8-point dithering. 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 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1350 S POS TARG 0.0000, 0.0000; (1350 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1350 S POS TARG 0.1740, 0.2350 (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1406 S POS TARG 0.3232, 0.1235; (1406 S) SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1407 S POS TARG 0.1005, 0.3305 (1407 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1406 S POS TARG 0.5075, 0.0505; (1406 S) SEQ 5-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1407 S POS TARG 0.6815, 0.2855 (1407 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1406 S POS TARG 0.8300, 0.1735; (1406 S) SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8 TUCANA-DSPH ACS/WFC ACCUM WFCENTER F814W 1 1407 S POS TARG 0.6080, 0.3810 (1407 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 | ------------------------------------------------------------------------------------------------------------------------------------ TUCANA-DSPH 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A TUCANA-DSPH 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A TUCANA-DSPH 3 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A TUCANA-DSPH 4 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A TUCANA-DSPH 5 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A TUCANA-DSPH 6 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A TUCANA-DSPH 7 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A TUCANA-DSPH 8 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 8] Visit: 04 (SAG-DIRR) Visit Requirements: ORIENT 87.261D TO 87.261 D; GROUP 04, 05 WITHIN 30D On Hold Comments: Additional Comments: This is the first visit for imaging the Sagittarius dwarf irregular galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of PID 9820 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POST-ARG special requirements. For each visit we will do a set of 8-point dithering. We added the Timing Requirement of "GROUP 04, 05 WITHIN 30D" so that they can be treated as single epoch data for astrometric analysis. 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 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.0000, 0.0000; (1222 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1223 S POS TARG 0.2228, 0.1158 (1223 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.0998, 0.2303; (1279 S) SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.3225, 0.3460 (1279 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.4075, 0.0306; (1279 S) SEQ 5-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.6304, 0.1464 (1279 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.5073, 0.2609; (1279 S) SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.7302, 0.3767 (1279 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 | ------------------------------------------------------------------------------------------------------------------------------------ SAG-DIRR 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A SAG-DIRR 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A SAG-DIRR 3 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A SAG-DIRR 4 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A SAG-DIRR 5 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A SAG-DIRR 6 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ SAG-DIRR 7 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A SAG-DIRR 8 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 10] Visit: 05 (SAG-DIRR) Visit Requirements: ORIENT 87.261D TO 87.261 D; GROUP 05, 04 WITHIN 30D On Hold Comments: Additional Comments: This is the second visit for imaging the Sagittarius dwarf irregular galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of PID 9820 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POST-ARG special requirements. For each visit we will do a set of 8-point dithering. We added the Timing Requirement of "GROUP 05, 04 WITHIN 30D" so that they can be treated as single epoch data for astrometric analysis. 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 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.0018, 0.4085; (1222 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1223 S POS TARG 0.2246, 0.5243 (1223 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.1017, 0.6388; (1279 S) SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.3244, 0.7545 (1279 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.4093, 0.4392; (1279 S) SEQ 5-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.6322, 0.5550 (1279 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.5091, 0.6695; (1279 S) SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 8 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1279 S POS TARG 0.7320, 0.7852 (1279 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 | ------------------------------------------------------------------------------------------------------------------------------------ SAG-DIRR 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A SAG-DIRR 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A SAG-DIRR 3 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A SAG-DIRR 4 ACS/WFC ACCUM WFCENTER F814W none none none none 2 N/A SAG-DIRR 5 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A SAG-DIRR 6 ACS/WFC ACCUM WFCENTER F814W none none none none 3 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ SAG-DIRR 7 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A SAG-DIRR 8 ACS/WFC ACCUM WFCENTER F814W none none none none 4 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 12] Visit: 06 (SAG-DIRR) Visit Requirements: ORIENT 87.261D TO 87.261 D On Hold Comments: Additional Comments: This is one-orbit visit for the TTRB-approved partial reobservation of visit 04 for imaging the Sagittarius dwarf irregular galaxy. One orbit is required to complete this visit. Since our goal is to measure proper motions of stars in the target galaxy, our orientation is set to exactly match the previous observations of PID 9820 and 12273. We adopt a customized dither pattern designed to optimally cover the pixel phase using the POST-ARG special requirements. For this visit we will do 2-point dithering. 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 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1198 S POS TARG 0.0000, 0.0000; (1198 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 SAG-DIRR ACS/WFC ACCUM WFCENTER F814W 1 1197 S POS TARG 0.2228, 0.1158 (1197 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 | ------------------------------------------------------------------------------------------------------------------------------------ SAG-DIRR 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A SAG-DIRR 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A 15911( 5) - 17-Sep-2020 15:44:06 - [ 13] Summary Form for Proposal 15911 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 04, 05 WITHIN 30D, GROUP 05, 04 WITHIN 30D, GS ACQ SCENARIO BASE1B3, ORIENT 231.554D TO 231.554 D, ORIENT 266.015D TO 266.015 D, ORIENT 283.239D TO 283.239 D, ORIENT 87.261D TO 87.261 D, POS TARG 0.0000, 0.0000, POS TARG 0.0018, 0.4085, POS TARG 0.0998, 0.2303, POS TARG 0.1005, 0.3305, POS TARG 0.1017, 0.6388, POS TARG 0.1740, 0.2350, POS TARG 0.2228, 0.1158, POS TARG 0.2246, 0.5243, POS TARG 0.3225, 0.3460, POS TARG 0.3232, 0.1235, POS TARG 0.3244, 0.7545, POS TARG 0.4075, 0.0306, POS TARG 0.4093, 0.4392, POS TARG 0.5073, 0.2609, POS TARG 0.5075, 0.0505, POS TARG 0.5091, 0.6695, POS TARG 0.6080, 0.3810, POS TARG 0.6304, 0.1464, POS TARG 0.6322, 0.5550, POS TARG 0.6815, 0.2855, POS TARG 0.7302, 0.3767, POS TARG 0.7320, 0.7852, POS TARG 0.8300, 0.1735, SEQ 1-2 NON-INT, SEQ 3-4 NON-INT, SEQ 5-6 NON-INT, SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CETUS-DSPH, LEOA-DIRR, SAG-DIRR, TUCANA-DSPH ------------------------------------------------------------------------------------------------------------------------------------