0 Assigned ID: 694 ----- Attempting Submission 1 (Fri Apr 05 20:09:15 GMT 2019) ----- HST Phase I Proposal 694 (LGDwarfs.apt) successfully submitted. Receipt: # 694-1 ----- Attempting Submission 2 (Fri Apr 05 23:41:34 GMT 2019) ----- HST Phase I Proposal 694 (LGDwarfs.apt) successfully submitted. Receipt: # 694-2 ----- Attempting Submission 3 (Fri Apr 05 23:59:44 GMT 2019) ----- HST Phase I Proposal 694 (LGDwarfs.apt) successfully submitted. Receipt: # 694-3 ----- Attempting Submission 4 (Sat Apr 06 00:00:24 GMT 2019) ----- The number of orbits used exceeds the number allocated ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN One-orbit visit was added for the TTRB-approved partial reobservation of visit 04. 58200269 ----- Attempting Submission 1 (Wed Jul 10 18:17:06 GMT 2019) ----- ----- Attempting Submission 2 (Wed Sep 16 18:48:08 GMT 2020) ----- One-orbit visit was added to the original proposal for the TTRB-approved partial reobservation of Visit 04. Orbits of Isolated Dwarfs: Local Group Mass and Environmental Quenching 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. 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 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. All investigators involved in the proposal are experts in the Local Group. Most of them are members of the High-Resolution Space Telescope Proper Motion (HSTPROMO) collaboration*, a team dedicated to improving our dynamical understanding of stars, clusters, and galaxies in the nearby Universe through measurement and interpretation of their proper motions (PMs) using the HST. PI del Pino is a postdoc at STScI, expert in internal dynamics of dwarf galaxies in the Local Group and will analyze the past orbits of the proposed dwarf galaxies looking for possible past interactions with the Milky Way or M31. Co-Is van der Marel and Tollerud are experts in dynamical analysis of stellar systems in the Local Group and will help interpreting HST PMs and connecting them to simulations. Co-I Sohn has pioneered the astrometric techniques relevant to this study, and will aid through the PM measurements and the proposed dynamical studies. Co-Is Fardal and Watkins are expert the dynamical modeling of stellar systems and have experience studying stellar populations using HST PMs. They will contribute to the study of their dynamical properties. Co-Is Patel and Besla are expert in dynamical modeling of the Local Group, and will help to derive the orbits of the proposed galaxies as well as the total mass of the Local Group. Co-Is Gallart, Aparicio, Monelli, and Sacchi are experts photometric studies of resolved stellar populations and star formation histories. They will help linking past star formation events in the darfs to their orbital history. * See list of refereed publications by HSTPROMO group at http://www.stsci.edu/~marel/hstpromo.html#Papers Stellar Populations Galaxies and the IGM 6 false false false false false false false SUPPORTED GALAXY DWARF SPHEROIDAL This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY DWARF SPHEROIDAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY DWARF SPHEROIDAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY DWARF SPHEROIDAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F814W The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /private/var/folders/k_/cl_qkzwn1rscvsdj6918k9jw0001q6/T/OPVisit163439056364744385.xml 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. 1597568318000 266.015 (Tic-Visit :proposal-id 15911 :visit-id "01" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:42:44.0" :trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2816 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "01" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "01" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) true 4 4 The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /private/var/folders/k_/cl_qkzwn1rscvsdj6918k9jw0001q6/T/OPVisit10854676914759512382.xml 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. (Tic-Visit :proposal-id 15911 :visit-id "02" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:43:28.0" :trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2878 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2878 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "02" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2878 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 4 4 The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /private/var/folders/k_/cl_qkzwn1rscvsdj6918k9jw0001q6/T/OPVisit4270361889588850779.xml 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. 1589092540000 231.55399999999997 (Tic-Visit :proposal-id 15911 :visit-id "03" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:43:45.0" :trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3078 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3411 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3411 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "03" :orbit-number 3 :pcs-time 392 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3411 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "03" :orbit-number 4 :pcs-time 392 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3411 :pcs-gap 0 ) true 4 4 Timing link suitability includes constraints ([Group (04 05) Within 30.0 days]) The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /private/var/folders/k_/cl_qkzwn1rscvsdj6918k9jw0001q6/T/OPVisit16069707566878095643.xml 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. 1599386387000 87.26100000000002 (Tic-Visit :proposal-id 15911 :visit-id "04" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:44:20.0" :trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2823 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "04" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "04" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "04" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) true 4 4 The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /Users/adelpinomolina/Work/HST_Proposal/Cycle27/APT/OP-cache/LGDwarfs_HOPR-v06.xml 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. (Tic-Visit :proposal-id 15911 :visit-id "06" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:16:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2773 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (04 05) Within 30.0 days]) The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /private/var/folders/k_/cl_qkzwn1rscvsdj6918k9jw0001q6/T/OPVisit6712776730968701616.xml 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. 1598511002000 87.26100000000002 (Tic-Visit :proposal-id 15911 :visit-id "05" :proposal-version -1 :trans-version "20200619" :date "16-Sep-2020 14:45:09.0" :trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15911 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15911 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2823 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "05" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "05" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15911 :visit-id "05" :orbit-number 4 :pcs-time 392 :si-vis-utilization 2854 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) true 4 4