0 Assigned ID: 4061 ----- Attempting Submission 1 (Mon May 22 23:13:43 GMT 2023) ----- HST Phase I Proposal 4061 successfully submitted. Receipt: # 4061-1 ----- Attempting Submission 2 (Wed May 24 16:15:42 GMT 2023) ----- HST Phase I Proposal 4061 successfully submitted. Receipt: # 4061-2 ----- Attempting Submission 3 (Wed May 24 23:04:39 GMT 2023) ----- HST Phase I Proposal 4061 successfully submitted. Receipt: # 4061-3 ----- Attempting Submission 4 (Wed May 24 23:23:08 GMT 2023) ----- HST Phase I Proposal 4061 successfully submitted. Receipt: # 4061-4 Phase II with repeat observations. 1961899585 ----- Attempting Submission 1 (Thu Sep 07 19:33:35 GMT 2023) ----- HST Phase II Proposal 17501 successfully submitted. Receipt: # 17501-1 ----- Attempting Submission 2 (Fri Sep 22 18:11:10 GMT 2023) ----- ----- Attempting Submission 3 (Tue May 07 13:08:21 GMT 2024) ----- Lone Lion or Part of a Pride: Proper Motion and Orbit of Leo P We propose to measure the first proper motion (PM) of a galaxy outside the LG by observing Leo P, a low mass, very low metallicity dwarf beyond the edge of the Local Group (LG, D=1.6 Mpc). By combining the new HST PM with the existing line-of-sight velocity, position and distance, we will precisely determine Leo P's trajectory, and compare the orbital characteristics and timescale with the existing star formation history (SFH). This will enable us to address several key questions such as: Is Leo P a member of the Antlia-Sextans group (ASG) or is it truly isolated? If it is part of the ASG, how did that dwarf galaxy group form? What is the transverse motion of galaxies outside the zero-velocity sphere of the LG? How does the SFH of Leo P relate to its environment, and are the sequence of bursts and quenches seen in its SFH driven by internal or external processes? And what are the implications for galaxy evolution at low masses? Leo P is far too distant and faint to be studied by Gaia. Only HST has the depth, astrometric precision and long time baselines via its archives to start measuring PMs of galaxies outside the LG. Thus, with Hubble's exceptional longevity and stability, we are able to continue to push back the frontiers of extra-galactic science. We will observe a single target field of the dwarf galaxy Leo P using ACS/WFC. This target field has deep ACS/WFC imaging data in the HST archive. In this program, the target field will be observed using the same telescope pointings and orientations as the first-epoch to maximize the overlaps of the observed fields between first- and second-epoch data. This will also minimize position-dependent uncertainties originating from imperfect CTE and geometric distortion corrections. To measure PMs, it is sufficient to observed only in one filter. Therefore, we will image all target fields using the F814W filter to measure PMs. Individual exposure times will be a half-orbit long to match the first-epoch, and we will use dithered patterns specially designed to maxmimuze pixel-phase coverage. We have divided our observqtions into 4 visits of 6 exposures (3 orbits) and a single visit of 8 exposures (4 orbits). For these seperate visits we added Timinig Requirements "GROUP WITHIN 30D" so that they can be treated as single epoch data for astrometric analyses. Team Expertise: All investigators are members of the HSTPROMO group, led by co-I van der Marel, which has published numerous papers reporting proper motion measurements of dwarf galaxies, globular clusters, individual stars along stellar streams, and distant Milky Way (MW) halo stars. PI Dr Paul Bennet is an expert in satellites inside and outside of the LG. He has had previous experience leading successful HST programs e.g GO-15858 (Bennet et al. 2020). He will perform the majority of the work for this project. Co-I Dr Tony Sohn is an expert in measuring HST proper motions, his past measurements include M31, bulk proper motions of dwarf spheroidal galaxies in the Milky Way halo (Leo I, Draco, and Sculptor), individual proper motions of stars along stellar streams such as Sagittarius, Orphan, and Lethe, distant Milky Way globular clusters, and M31 satellites NGC 147 and 185. He will contribute to the PM measurements part of this work. Co-I Dr Andres del Pino-Molina is an expert in analysis of internal dynamics and star formation histories of dwarf galaxies in the Local Group. He will contribute to the interpretation of the results. Co-Is Dr Mark Fardal, Dr Ekta Patel, Dr Roeland van der Marel, Dr. Eduardo Vitral and Dr Laura Watkins are experts in HST kinematic analysis, dynamical mass estimation, and dynamical modeling of Local Group and nearby Local Volume galaxies including both equilibrium and N-body modeling. They will contribute to the orbital calculations and interpretation of the results. See list of refereed publications by the HSTPROMO group at http://www.stsci.edu/~marel/hstpromo.html#Papers Stellar Populations and the Interstellar Medium Galaxies 6 false false false false false false false false SUPPORTED GALAXY DWARF ELLIPTICAL STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F814W Timing link suitability includes constraints ([Group (01 02 03 04 05) Within 30.0 days] [Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days] [Group (01 02 03 04 06) Within 30.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 3 orbit visit for Leo P. 1713341978000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "01" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:22:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "01" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2694 :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 3139 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([Group (01 02 03 04 05) Within 30.0 days] [Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days] [Group (01 02 03 04 06) Within 30.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 3 orbit visit for Leo P. 1713603780000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "02" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:23:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([Group (01 02 03 04 05) Within 30.0 days] [Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days] [Group (01 02 03 04 06) Within 30.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 3 orbit visit for Leo P. 1713689146000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "03" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:23:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "03" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([Group (01 02 03 04 05) Within 30.0 days] [Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days] [Group (01 02 03 04 06) Within 30.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 3 orbit visit for Leo P. 1713774518000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "04" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:23:19.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "04" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "04" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([Group (01 02 03 04 05) Within 30.0 days] [Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 2 orbit visit for Leo P. 1713859881000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "05" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:23:21.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "05" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) true 2 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06) Within 30.0 days] [Group (01 02 03 04 05 06 51) Within 60.0 days] [Group (01 02 03 04 06) Within 30.0 days]) The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. This is a 2 orbit visit for Leo P. 1713529794000 95.01999999999998 (Tic-Visit :proposal-id 17501 :visit-id "06" :proposal-version -1 :trans-version "20230626" :date "22-Sep-2023 11:23:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :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 3139 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "06" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2674 :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 3139 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. /private/var/folders/8t/mg1bkfyj20xf2vfc_9vyhfs80006z1/T/OPVisit10330295084736746785.xml This is a two orbit visit to repeat failed observations from visits 1 & 5. (Tic-Visit :proposal-id 17501 :visit-id "51" :proposal-version -1 :trans-version "20240604" :date "01-Jul-2024 11:50:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17501 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17501 :visit-id "51" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2642 :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 3023 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17501 :visit-id "51" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2642 :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 3023 :pcs-gap 0 ) true 2 0