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15911 (Stsci Edit Number: 2, Created: Thursday, September 17, 2020 at 11:00:53 AM Eastern Standard Time) - Overview

15911 (Stsci Edit Number: 2, Created: Thursday, September 17, 2020 at 11:00:53 AM Eastern Standard Time) - Overview

Proposal 15911 (STScI Edit Number: 2, Created: Thursday, September 17, 2020 at 11:00:53 AM Eastern Standard Time) - Overview

15911 - Orbits of Isolated Dwarfs: Mass and Environmental Quenching Cycle: 27, Proposal Category: GO (Availability Mode: SUPPORTED)

INVESTIGATORS Name Institution E-Mail Andres del Pino Molina (PI) (Contact) Space Telescope Science Institute [email protected] Dr. Sangmo Tony Sohn (CoI) Space Telescope Science Institute [email protected] Dr. Mark Fardal (CoI) Space Telescope Science Institute [email protected] Dr. Roeland P. van der Marel (CoI) (AdminUSPI) Space Telescope Science Institute [email protected] Ms. Ekta Patel (CoI) University of Arizona [email protected] Dr. Gurtina Besla (CoI) University of Arizona [email protected] Dr. Laura L. Watkins (CoI) (ESA Member) Space Telescope Science Institute - ESA [email protected] Dr. Elena Sacchi (CoI) Space Telescope Science Institute [email protected] Dr. Erik Tollerud (CoI) Space Telescope Science Institute [email protected] Dr. Antonio Aparicio (CoI) (ESA Member) Instituto de Astrofisica de Canarias [email protected] Dr. Carme Gallart (CoI) (ESA Member) Instituto de Astrofisica de Canarias [email protected] Dr. Matteo Monelli (CoI) (ESA Member) Instituto de Astrofisica de Canarias [email protected]

VISITS Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 01 (1) -DSPH ACS/WFC 4 17-Sep-2020 12:00:46.0 yes 02 (2) LEOA-DIRR ACS/WFC 4 17-Sep-2020 12:00:47.0 yes 03 (3) -DSPH ACS/WFC 4 17-Sep-2020 12:00:49.0 yes

1 Proposal 15911 (STScI Edit Number: 2, Created: Thursday, September 17, 2020 at 11:00:53 AM Eastern Standard Time) - Overview Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 04 (4) SAG-DIRR ACS/WFC 4 17-Sep-2020 12:00:51.0 yes 06 (4) SAG-DIRR ACS/WFC 1 17-Sep-2020 12:00:51.0 yes 05 (4) SAG-DIRR ACS/WFC 4 17-Sep-2020 12:00:52.0 yes 21 Total Orbits Used

ABSTRACT Dwarf are excellent test particles for studying dynamical properties of the Local Group (LG) and the role of environment in quenching of 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 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.

OBSERVING 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 extending the time baseline from 5-8 to 14-17 years. For the measurements, we will measure the average motion of in each dwarf 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 2 Proposal 15911 (STScI Edit Number: 2, Created: Thursday, September 17, 2020 at 11:00:53 AM Eastern Standard Time) - Overview 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.

3 Proposal 15911-CETUS(01)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Exposures Fixed Targets Diagnostics Visit 8 7 6 5 4 3 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheNEDdatabase. (1) # (CETUS (01))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (CETUS (01))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (CETUS (01))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (CETUS (01))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN do asetof8-pointdithering. set toexactlymatchthepreviousobservationsofprogramsGO-10505and 12273.WeadoptacustomizedditherpatterndesignedtooptimallycoverthepixelphaseusingPOS-TARGspecialrequirements.will Comments: ThisisthevisitforimagingCetusdwarfspheroidalgalaxy.Fourorbitsarerequiredtocompletethisvisit.Sinceourgoalmeasure propermotionsofstarsinthetargetgalaxy,ourorientationis Special Requirements:ORIENT266.015DTO266.015D Scientific Instruments:ACS/WFC Diagnostic Status:Warning Proposal 15911,CETUS(01),completed Label CETUS-DSPH Name (1) CETUS-DSPH (1) CETUS-DSPH (1) CETUS-DSPH Target (1) CETUS-DSPH (1) CETUS-DSPH (1) CETUS-DSPH (1) CETUS-DSPH (1) CETUS-DSPH Equinox: J2000 Dec: -110433.95(-11.07610d) RA: 00269.6193(6.5400804d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W F814W F814W F814W Spectral Els. F814W F814W F814W Targ. Coord.Corrections Opt. Params. 4 .0505 POS TARG0.5075,0 .3305 POS TARG0.1005,0 .1235 POS TARG0.3232,0 .2350 POS TARG0.1740,0 .0000 POS TARG0.0000,0 Special Reqs. .3810 POS TARG0.6080,0 .1735 POS TARG0.8300,0 .2855 POS TARG0.6815,0 V=13.2 Fluxes t inCETUS(01) Sequence 7-8Non-In t inCETUS(01) Sequence 7-8Non-In t inCETUS(01) Sequence 5-6Non-In t inCETUS(01) Sequence 5-6Non-In t inCETUS(01) Sequence 3-4Non-In t inCETUS(01) Sequence 3-4Non-In t inCETUS(01) Sequence 1-2Non-In t inCETUS(01) Sequence 1-2Non-In Groups [==>] 1276 Secs(1276Secs) [==>] 1275 Secs(1275Secs) [==>] 1276 Secs(1276Secs) [==>] 1275 Secs(1275Secs) [==>] 1276 Secs(1276Secs) [==>] 1275 Secs(1275Secs) [==>] 1219 Secs(1219Secs) [==>] 1219 Secs(1219Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:NED Miscellaneous Thu Sep1716:00:53GMT2020 Orbit [4] [4] [3] [3] [2] [2] [1] [1] Proposal 15911-CETUS(01)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Orbit Structure 5 Proposal 15911 - CETUS (01) - Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching

6 Proposal 15911-LEOA-DIRR(02)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Exposures Fixed Targets Diagnostics Visit 8 7 6 5 4 3 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (2) # (LEOA-DIRR (02))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (LEOA-DIRR (02))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (LEOA-DIRR (02))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (LEOA-DIRR (02))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN point dithering. to exactlymatchthepreviousobservationsofPID10505and12273.We adoptacustomizedditherpatterndesignedtooptimallycoverthepixelphaseusingPOS-TARGspecialrequirements.Wewilldosetof8- Comments: ThisisthevisitforimagingLeoAdwarfirregulargalaxy.Fourorbitsarerequiredtocompletethisvisit.Sinceourgoalmeasure propermotionsofstarsinthetargetgalaxy,ourorientationisset Special Requirements:ORIENT283.239DTO283.239D Scientific Instruments:ACS/WFC Diagnostic Status:Warning Proposal 15911,LEOA-DIRR(02),scheduling Label LEOA-DIRR Name (2) LEOA-DIRR (2) LEOA-DIRR Target (2) LEOA-DIRR (2) LEOA-DIRR (2) LEOA-DIRR (2) LEOA-DIRR (2) LEOA-DIRR (2) LEOA-DIRR Equinox: J2000 Dec: +304520.38(30.75566d) RA: 095924.7256(149.8530233d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W F814W F814W Spectral Els. F814W F814W F814W F814W Epoch ofPosition:2015.5 Targ. Coord.Corrections Opt. Params. 7 .3305 POS TARG0.1005,0 .1235 POS TARG0.3232,0 .2350 POS TARG0.1740,0 O BASE1B3 GS ACQSCENARI .0000; POS TARG0.0000,0 Special Reqs. .3810 POS TARG0.6080,0 .1735 POS TARG0.8300,0 .2855 POS TARG0.6815,0 .0505 POS TARG0.5075,0 V=12.4 Fluxes ) t inLEOA-DIRR(02 Sequence 7-8Non-In ) t inLEOA-DIRR(02 Sequence 7-8Non-In ) t inLEOA-DIRR(02 Sequence 5-6Non-In ) t inLEOA-DIRR(02 Sequence 5-6Non-In ) t inLEOA-DIRR(02 Sequence 3-4Non-In ) t inLEOA-DIRR(02 Sequence 3-4Non-In ) t inLEOA-DIRR(02 Sequence 1-2Non-In ) t inLEOA-DIRR(02 Sequence 1-2Non-In Groups [==>] 1291 Secs(1291Secs) [==>] 1291 Secs(1291Secs) [==>] 1291 Secs(1291Secs) [==>] 1291 Secs(1291Secs) [==>] 1291 Secs(1291Secs) [==>] 1291 Secs(1291Secs) [==>] 1235 Secs(1235Secs) [==>] 1234 Secs(1234Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:SIMBAD Miscellaneous Thu Sep1716:00:53GMT2020 Orbit [4] [4] [3] [3] [2] [2] [1] [1] Proposal 15911-LEOA-DIRR(02)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Orbit Structure 8 Proposal 15911 - LEOA-DIRR (02) - Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching

9 Proposal 15911-TUCANA-DSPH(03)OrbitsofIsolatedDwarfs:LocalGroupMassand EnvironmentalQuenching Exposures Fixed Targets Diagnostics Visit 8 7 6 5 4 3 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (3) # (TUCANA-DSPH (03))Warning(OrbitPlanner):ORBITALVISIBILITY OVERRUN (TUCANA-DSPH (03))Warning(OrbitPlanner):ORBITALVISIBILITY OVERRUN (TUCANA-DSPH (03))Warning(OrbitPlanner):ORBITALVISIBILITY OVERRUN (TUCANA-DSPH (03))Warning(OrbitPlanner):ORBITALVISIBILITY OVERRUN of 8-pointdithering. set toexactlymatchthepreviousobservationsofPID10505and12273. WeadoptacustomizedditherpatterndesignedtooptimallycoverthepixelphaseusingPOS-TARGspecialrequirements.willdoset Comments: ThisisthevisitforimagingTucanadwarfspheroidalgalaxy.Fourorbitsarerequiredtocompletethisvisit.Sinceourgoalmeasure propermotionsofstarsinthetargetgalaxy,ourorientationis Special Requirements:ORIENT231.554DTO231.554D Scientific Instruments:ACS/WFC Diagnostic Status:Warning Proposal 15911,TUCANA-DSPH(03),completed Label TUCANA-DSPH Name (3) TUCANA-DSPH (3) TUCANA-DSPH Target (3) TUCANA-DSPH (3) TUCANA-DSPH (3) TUCANA-DSPH (3) TUCANA-DSPH (3) TUCANA-DSPH (3) TUCANA-DSPH Equinox: J2000 Dec: -642515.34(-64.42093d) RA: 224148.1023(340.4504263d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W F814W F814W Spectral Els. F814W F814W F814W F814W Epoch ofPosition:2015.5 Targ. Coord.Corrections Opt. Params. 10 .3305 POS TARG0.1005,0 .1235 POS TARG0.3232,0 .2350 POS TARG0.1740,0 .0000 POS TARG0.0000,0 Special Reqs. .3810 POS TARG0.6080,0 .1735 POS TARG0.8300,0 .2855 POS TARG0.6815,0 .0505 POS TARG0.5075,0 V=15.2 Fluxes (03) t inTUCANA-DSPH Sequence 7-8Non-In (03) t inTUCANA-DSPH Sequence 7-8Non-In (03) t inTUCANA-DSPH Sequence 5-6Non-In (03) t inTUCANA-DSPH Sequence 5-6Non-In (03) t inTUCANA-DSPH Sequence 3-4Non-In (03) t inTUCANA-DSPH Sequence 3-4Non-In (03) t inTUCANA-DSPH Sequence 1-2Non-In (03) t inTUCANA-DSPH Sequence 1-2Non-In Groups [==>] 1407 Secs(1407Secs) [==>] 1406 Secs(1406Secs) [==>] 1407 Secs(1407Secs) [==>] 1406 Secs(1406Secs) [==>] 1407 Secs(1407Secs) [==>] 1406 Secs(1406Secs) [==>] 1350 Secs(1350Secs) [==>] 1350 Secs(1350Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:SIMBAD Miscellaneous Thu Sep1716:00:54GMT2020 Orbit [4] [4] [3] [3] [2] [2] [1] [1] Proposal 15911-TUCANA-DSPH(03)OrbitsofIsolatedDwarfs:LocalGroupMassand EnvironmentalQuenching Orbit Structure 11 Proposal 15911 - TUCANA-DSPH (03) - Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching

12 Proposal 15911-SAG-DIRR(04)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Exposures Fixed Targets Diagnostics Visit 8 7 6 5 4 3 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (4) # (SAG-DIRR (04))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (04))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (04))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (04))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN each visitwewilldoasetof8-pointdithering.WeaddedtheTimingRequirement of"GROUP04,05WITHIN30D"sothattheycanbetreatedassingleepochdataforastrometricanalysis. orientation issettoexactlymatchthepreviousobservationsofPID9820 and12273.WeadoptacustomizedditherpatterndesignedtooptimallycoverthepixelphaseusingPOST-ARGspecialrequirements.For Comments: ThisisthefirstvisitforimagingSagittariusdwarfirregulargalaxy.Fourorbitsarerequiredtocompletethisvisit.Sinceourgoal istomeasurepropermotionsofstarsinthetargetgalaxy,our Special Requirements:ORIENT87.261DTO87.261D;GROUP04,05WITHIN30D Scientific Instruments:ACS/WFC Diagnostic Status:Warning Proposal 15911,SAG-DIRR(04),completed Label SAG-DIRR Name (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR Target (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR Equinox: J2000 Dec: -174046.83(-17.67967d) RA: 192959.2059(292.4966913d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W F814W F814W F814W Spectral Els. F814W F814W F814W Epoch ofPosition:2015.5 Targ. Coord.Corrections Opt. Params. 13 .0306 POS TARG0.4075,0 .3460 POS TARG0.3225,0 .2303 POS TARG0.0998,0 .1158 POS TARG0.2228,0 .0000 POS TARG0.0000,0 Special Reqs. .3767 POS TARG0.7302,0 .2609 POS TARG0.5073,0 .1464 POS TARG0.6304,0 V=13.6 Fluxes t inSAG-DIRR(04) Sequence 7-8Non-In t inSAG-DIRR(04) Sequence 7-8Non-In t inSAG-DIRR(04) Sequence 5-6Non-In t inSAG-DIRR(04) Sequence 5-6Non-In t inSAG-DIRR(04) Sequence 3-4Non-In t inSAG-DIRR(04) Sequence 3-4Non-In t inSAG-DIRR(04) Sequence 1-2Non-In t inSAG-DIRR(04) Sequence 1-2Non-In Groups [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1223 Secs(1223Secs) [==>] 1222 Secs(1222Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:SIMBAD Miscellaneous Thu Sep1716:00:54GMT2020 Orbit [4] [4] [3] [3] [2] [2] [1] [1] Proposal 15911-SAG-DIRR(04)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Orbit Structure 14 Proposal 15911 - SAG-DIRR (04) - Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching

15 Proposal 15911-SAG-DIRR(06)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Orbit Structure Exposures Fixed Targets Visit 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (4) # using thePOST-ARGspecialrequirements.Forthisvisitwewilldo2-point dithering. proper motionsofstarsinthetargetgalaxy,ourorientationissettoexactly matchthepreviousobservationsofPID9820and12273.Weadoptacustomizedditherpatterndesignedtooptimallycoverpixelphase Comments: Thisisone-orbitvisitfortheTTRB-approvedpartialreobservationof04imagingSagittariusdwarfirregulargalaxy.One orbitisrequiredtocompletethisvisit.Sinceourgoalmeasure Special Requirements:ORIENT87.261DTO87.261D Scientific Instruments:ACS/WFC Diagnostic Status:NoDiagnostics Proposal 15911,SAG-DIRR(06) Label SAG-DIRR Name (4) SAG-DIRR (4) SAG-DIRR Target Equinox: J2000 Dec: -174046.83(-17.67967d) RA: 192959.2059(292.4966913d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W Spectral Els. Epoch ofPosition:2015.5 Targ. Coord.Corrections Opt. Params. 16 .1158 POS TARG0.2228,0 .0000 POS TARG0.0000,0 Special Reqs. V=13.6 Fluxes t inSAG-DIRR(06) Sequence 1-2Non-In t inSAG-DIRR(06) Sequence 1-2Non-In Groups [==>] 1197 Secs(1197Secs) [==>] 1198 Secs(1198Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:SIMBAD Miscellaneous Thu Sep1716:00:54GMT2020 Orbit [1] [1] Proposal 15911-SAG-DIRR(05)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Exposures Fixed Targets Diagnostics Visit 8 7 6 5 4 3 2 1 # Description=[DWARF SPHEROIDAL] Category=GALAXY Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (4) # (SAG-DIRR (05))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (05))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (05))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN (SAG-DIRR (05))Warning(OrbitPlanner):ORBITALVISIBILITYOVERRUN each visitwewilldoasetof8-pointdithering.WeaddedtheTimingRequirement of"GROUP05,04WITHIN30D"sothattheycanbetreatedassingleepochdataforastrometricanalysis. orientation issettoexactlymatchthepreviousobservationsofPID9820 and12273.WeadoptacustomizedditherpatterndesignedtooptimallycoverthepixelphaseusingPOST-ARGspecialrequirements.For Comments: ThisisthesecondvisitforimagingSagittariusdwarfirregulargalaxy.Fourorbitsarerequiredtocompletethisvisit.Sinceourgoal istomeasurepropermotionsofstarsinthetargetgalaxy,our Special Requirements:ORIENT87.261DTO87.261D;GROUP05,04WITHIN30D Scientific Instruments:ACS/WFC Diagnostic Status:Warning Proposal 15911,SAG-DIRR(05),completed Label SAG-DIRR Name (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR Target (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR (4) SAG-DIRR Equinox: J2000 Dec: -174046.83(-17.67967d) RA: 192959.2059(292.4966913d) Target Coordinates ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER ACS/WFC, ACCUM,WFCENTER Config,Mode,Aperture F814W F814W F814W F814W F814W Spectral Els. F814W F814W F814W Epoch ofPosition:2015.5 Targ. Coord.Corrections Opt. Params. 17 .4392 POS TARG0.4093,0 .7545 POS TARG0.3244,0 .6388 POS TARG0.1017,0 .5243 POS TARG0.2246,0 .4085 POS TARG0.0018,0 Special Reqs. .7852 POS TARG0.7320,0 .6695 POS TARG0.5091,0 .5550 POS TARG0.6322,0 V=13.6 Fluxes t inSAG-DIRR(05) Sequence 7-8Non-In t inSAG-DIRR(05) Sequence 7-8Non-In t inSAG-DIRR(05) Sequence 5-6Non-In t inSAG-DIRR(05) Sequence 5-6Non-In t inSAG-DIRR(05) Sequence 3-4Non-In t inSAG-DIRR(05) Sequence 3-4Non-In t inSAG-DIRR(05) Sequence 1-2Non-In t inSAG-DIRR(05) Sequence 1-2Non-In Groups [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1279 Secs(1279Secs) [==>] 1223 Secs(1223Secs) [==>] 1222 Secs(1222Secs) Exp. Time(Total)/[ActualDur.] Reference Frame:SIMBAD Miscellaneous Thu Sep1716:00:54GMT2020 Orbit [4] [4] [3] [3] [2] [2] [1] [1] Proposal 15911-SAG-DIRR(05)OrbitsofIsolatedDwarfs:LocalGroupMassandEnvironmental Quenching Orbit Structure 18 Proposal 15911 - SAG-DIRR (05) - Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching

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