14236( 2) - 21-Jul-2015 18:01:21 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14236 Version: 2 Check-in Time: 21-Jul-2015 18:01:21 STScI Edit Number: 0 Title The First Proper Motions of Ultra-faint Dwarf Galaxies: Probing Reionization and Planar Associations of Satellites ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Sangmo Tony Sohn The Johns Hopkins University Y CoI: Dr. Gurtina Besla University of Arizona N CoI: Dr. Andrew Wetzel California Institute of Technology N CoI: Dr. Nitya Kallivayalil The University of Virginia N CoI: Dr. Roeland P. van der Marel Space Telescope Science Institute N CoI: Dr. Tobias Fritz The University of Virginia N ------------------------------------------------------------------------------------ Abstract Ultra-faint dwarf (UFDs) galaxies are the least luminous, dark-matter dominated galaxies in our Universe. As potential fossil relics of the epoch of reionization, these extreme galaxies play a crucial role in reconciling predictions from LCDM theory, such as the observed number of satellites about our Milky Way (MW). However, none of these galaxies have measured proper motions (PMs), meaning we do not know their orbital histories or their relationship to other satellites over time. We propose to use HST ACS/WFC to make the first PM measurements for 6 UFDs with star formation histories suggesting quenching at the epoch of reionization. Using techniques we have developed to model the orbits of satellites like Leo I and the Magellanic Clouds, these PMs will constrain the orbital histories of a representative sample of UFDs for the first time. We will furthermore compare these orbits to predictions for UFDs from cosmological simulations made by our team. HST is significantly more accurate for PM measurements of our target galaxies than Gaia. Moreover, with HST we can do these measurements now, whereas the most accurate Gaia measurements are still 7 years into the future. With only a modest investment of HST time and proven techniques of our team, these novel HST observations will thus revolutionize our understanding of UFDs, establishing for the first time: (1) Whether star formation was suppressed by reionization; (2) Whether the UFDs ever passed close enough to the MW to have undergone significant tidal heating; and (3) Whether the UFDs orbit in a plane that is associated with the classical satellites. ------------------------------------------------------------------------------------ Observations Description ------------------------ To measure absolute proper motions of our 4 target galaxies, we will use compact background galaxies in the field of view (FOV) as stationary reference sources. We will measure the average motion of stars in the target galaxies between epochs 1 and 2 with respect to these reference sources. Our analysis techniques and expected accuracies are described in the Phase I proposal. First epoch ACS data are available as part of previous observing programs by PI T. Brown (Proposal GO-12549). The present project will obtain the second epoch data. The first epoch ACS data were obtained in two filters (F606W and F814W) to make 14236( 2) - 21-Jul-2015 18:01:21 - [ 2] deep color magnitude diagrams that reach well below the main sequence turn-off of our target galaxies. The available broad-band colors and depth are sufficient for separating dwarf member stars, foreground stars, and background galaxies to first order. For the second epoch it is therefore sufficient to take data in only one of the filters. We will observe the target galaxies with the F606W filter using the same pointing and orientation used for the first epoch data. Individual exposures will be sub-pixel dithered and will last one-third to half an orbit. We will use customized dither patterns to maximize the pixel phase coverage. To maximize the time baseline, we have added Timing Requirements for 3 of our visits. During our second epoch observations, the WFC3/UVIS camera will be pointed ~6 arcmin away in the outer halo of each target galaxy. These parallel fields overlap with the first-epoch images as well, but the expected stellar density is much lower than the ACS/WFC fields. Nevertheless, we will identify dwarf member stars and measure their proper motions using the same measurement technique as we use for the ACS/WFC data. These will further reduce our final proper motion errors. ------------------------------------------------------------------------------------ 14236( 2) - 21-Jul-2015 18:01:21 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CVN-II-DSPH GALAXY, DWARF RA=12H57M10.5066S +/- 0.1", J2000 V = 16.1 SPHEROIDAL DEC=+34D19'22.01" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 HERCULES-DSP GALAXY, DWARF RA=16H31M11.6052S +/- 0.1", J2000 V = 14.0 H SPHEROIDAL DEC=+12D46'47.54" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 LEO-IV-DSPH GALAXY, DWARF RA=11H32M57.3376S +/- 0.1", J2000 V = 15.1 SPHEROIDAL DEC=-00D30'59.97" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 UMA-I-DSPH GALAXY, DWARF RA=10H35M4.1638S +/- 0.1", J2000 V = 14.4 SPHEROIDAL DEC=+51D56'51.23" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14236( 2) - 21-Jul-2015 18:01:21 - [ 4] Visit: 01 Visit Requirements: ORIENT 146.9847D TO 146.9847 D On Hold Comments: Additional Comments: This visit is for obtaining second-epoch images of the Canes Venatici II dwarf spheroidal galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in our target galaxies, our orientation is set to exactly match the first-epoch images of GO-12549. We adopt a customized dither pattern to optimally cover the pixel phase using the POS-TARG requirements. 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 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1267 S POS TARG 0.0000, 0.0000; (1267 S) SEQ 1-4 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1267 S POS TARG 0.1740, 0.2350; (1267 S) PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.3232, 0.1235; (1363 S) SEQ 5-8 NON-INT; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.1005, 0.3305; (1363 S) PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.5075, 0.0505; (1363 S) SEQ 9-12 NON-INT; PAR 10 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.6815, 0.2855; (1363 S) PAR 12 WITH 11 ------------------------------------------------------------------------------------------------------------------------------------ 12 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) 14236( 2) - 21-Jul-2015 18:01:21 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 13 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.8300, 0.1735; (1363 S) SEQ 13-16 NON-INT; PAR 14 WITH 13 ------------------------------------------------------------------------------------------------------------------------------------ 14 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 S) ------------------------------------------------------------------------------------------------------------------------------------ 15 CVN-II-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1363 S POS TARG 0.6080, 0.3810; (1363 S) PAR 16 WITH 15 ------------------------------------------------------------------------------------------------------------------------------------ 16 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1347 S S ER (1347 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 | ------------------------------------------------------------------------------------------------------------------------------------ CVN-II-DSPH 1 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER CVN-II-DSPH 3 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER CVN-II-DSPH 5 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER CVN-II-DSPH 7 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 8 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER CVN-II-DSPH 9 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 10 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER CVN-II-DSPH 11 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 12 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER CVN-II-DSPH 13 ACS/WFC ACCUM WFCENTER F606W none none none none 4 N/A ANY 14 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 4 N/A S TER CVN-II-DSPH 15 ACS/WFC ACCUM WFCENTER F606W none none none none 4 N/A ANY 16 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 4 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 6] Visit: 02 Visit Requirements: ORIENT 103.0180D TO 103.0180 D; AFTER 01-JAN-2016:00:00:00 On Hold Comments: Additional Comments: This visit is for obtaining second-epoch images of the Hercules dwarf spheroidal galaxy. Three orbits are required to complete this visit. Since our goal is to measure proper motions of stars in our target galaxies, our orientation is set to exactly match the first-epoch images of GO-12549. We adopt a customized dither pattern to optimally cover the pixel phase using the POS-TARG requirements. The Visit Planner shows that our observations for this visit are available during two separate windows: one in Aug 2015 and the other in Aug 2016. It is necessary to maximize the time baseline of our proper motion measurements to fulfill our scientific goals, se we request this visit to be taken in Aug 2016. For this, we have added the Timing Requirements. 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 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1253 S POS TARG 0.0000, 0.0000; PH (1253 S) SEQ 1-4 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1253 S POS TARG 0.1647, 0.0124; PH (1253 S) PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1350 S POS TARG 0.3293, 0.0248; PH (1350 S) SEQ 5-8 NON-INT; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1350 S POS TARG 0.0747, 0.1294; PH (1350 S) PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1350 S POS TARG 0.2393, 0.1418; PH (1350 S) SEQ 9-12 NON-INT; PAR 10 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 S) ------------------------------------------------------------------------------------------------------------------------------------ 14236( 2) - 21-Jul-2015 18:01:21 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 HERCULES-DS ACS/WFC ACCUM WFCENTER F606W 1 1350 S POS TARG 0.4039, 0.1541; PH (1350 S) PAR 12 WITH 11 ------------------------------------------------------------------------------------------------------------------------------------ 12 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1333 S S ER (1333 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 | ------------------------------------------------------------------------------------------------------------------------------------ HERCULES-DSPH 1 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER HERCULES-DSPH 3 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER HERCULES-DSPH 5 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER HERCULES-DSPH 7 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 8 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER HERCULES-DSPH 9 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 10 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER HERCULES-DSPH 11 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 12 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 8] Visit: 03 Visit Requirements: SCHED 40%; ORIENT 295.0003D TO 295.0003 D; AFTER 01-JUL-2016:00:00:00 On Hold Comments: Additional Comments: This visit is for obtaining second-epoch images of the Leo IV dwarf spheroidal galaxy. Four orbits are required to complete this visit. Since our goal is to measure proper motions of stars in our target galaxies, our orientation is set to exactly match the first-epoch images of GO-12549. We adopt a customized dither pattern to optimally cover the pixel phase using the POS-TARG requirements. We have found that the with the requested orientation and default Schedulabilty, The Visit Planner fails to find observable windows. Therefore, we increased the Schedulability to 40. Also, the Visit Planner shows that our observations for this visit are available during two separate windows: one in late 2015 to early 2016, and the other in late 2016 to early 2017. It is necessary to maximize the time baseline of our proper motion measurements to fulfill our scientific goals, se we request this visit to be taken in the latter window. For this, we have added the Timing Requirements. 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 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1222 S POS TARG 0.0000, 0.0000; (1222 S) SEQ 1-4 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1300 S S ER (1300 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1222 S POS TARG 0.1740, 0.2350; (1222 S) PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1300 S S ER (1300 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1319 S POS TARG 0.3232, 0.1235; (1319 S) SEQ 5-8 NON-INT; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1318 S POS TARG 0.1005, 0.3305; (1318 S) PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1319 S POS TARG 0.5075, 0.0505; (1319 S) SEQ 9-12 NON-INT; PAR 10 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 S) 14236( 2) - 21-Jul-2015 18:01:21 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 11 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1318 S POS TARG 0.6815, 0.2855; (1318 S) PAR 12 WITH 11 ------------------------------------------------------------------------------------------------------------------------------------ 12 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 13 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1319 S POS TARG 0.8300, 0.1735; (1319 S) SEQ 13-16 NON-INT; PAR 14 WITH 13 ------------------------------------------------------------------------------------------------------------------------------------ 14 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 15 LEO-IV-DSPH ACS/WFC ACCUM WFCENTER F606W 1 1318 S POS TARG 0.6080, 0.3810; (1318 S) PAR 16 WITH 15 ------------------------------------------------------------------------------------------------------------------------------------ 16 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 1350 S S ER (1350 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEO-IV-DSPH 1 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LEO-IV-DSPH 3 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LEO-IV-DSPH 5 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER LEO-IV-DSPH 7 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 8 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER LEO-IV-DSPH 9 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 10 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER LEO-IV-DSPH 11 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 12 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER LEO-IV-DSPH 13 ACS/WFC ACCUM WFCENTER F606W none none none none 4 N/A ANY 14 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 4 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 10] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEO-IV-DSPH 15 ACS/WFC ACCUM WFCENTER F606W none none none none 4 N/A ANY 16 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 4 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 11] Visit: 04 Visit Requirements: ORIENT 206.8769D TO 206.8769 D; AFTER 01-JUL-2016:00:00:00 On Hold Comments: Additional Comments: This visit is for obtaining second-epoch images of the Hercules dwarf spheroidal galaxy. Three orbits are required to complete this visit. Since our goal is to measure proper motions of stars in our target galaxies, our orientation is set to exactly match the first-epoch images of GO-12549. We adopt a customized dither pattern to optimally cover the pixel phase using the POS-TARG requirements. The Visit Planner shows that our observations for this visit are available during two separate windows: one in Jan-Feb 2016 and the other in Jan-Feb 2017. It is necessary to maximize the time baseline of our proper motion measurements to fulfill our scientific goals, so we request this visit to be taken in Jan-Feb 2017. For this, we have added the Timing Requirements. 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 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 842 S (842 POS TARG 0.0000, 0.0000; S) SEQ 1-6 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 880 S (880 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 842 S (842 POS TARG 0.2141, 0.0161; S) PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 880 S (880 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 842 S (842 POS TARG 0.4281, 0.0322; S) PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 880 S (880 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 7 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.0504, 0.2183; S) SEQ 7-12 NON-INT; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 9 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.2644, 0.2344; S) PAR 10 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 11 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.4784, 0.2505; S) PAR 12 WITH 11 14236( 2) - 21-Jul-2015 18:01:21 - [ 12] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 12 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 13 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.1008, 0.4366; S) SEQ 13-18 NON-INT; PAR 14 WITH 13 ------------------------------------------------------------------------------------------------------------------------------------ 14 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 15 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.3148, 0.4527; S) PAR 16 WITH 15 ------------------------------------------------------------------------------------------------------------------------------------ 16 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 17 UMA-I-DSPH ACS/WFC ACCUM WFCENTER F606W 1 909 S (909 POS TARG 0.5288, 0.4688; S) PAR 18 WITH 17 ------------------------------------------------------------------------------------------------------------------------------------ 18 ANY WFC3/UVI ACCUM UVIS-CENT F606W 1 930 S (930 S ER 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 | ------------------------------------------------------------------------------------------------------------------------------------ UMA-I-DSPH 1 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER UMA-I-DSPH 3 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER UMA-I-DSPH 5 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A ANY 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER UMA-I-DSPH 7 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 8 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER UMA-I-DSPH 9 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 10 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER UMA-I-DSPH 11 ACS/WFC ACCUM WFCENTER F606W none none none none 2 N/A ANY 12 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 13] 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 | ------------------------------------------------------------------------------------------------------------------------------------ UMA-I-DSPH 13 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 14 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER UMA-I-DSPH 15 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 16 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER UMA-I-DSPH 17 ACS/WFC ACCUM WFCENTER F606W none none none none 3 N/A ANY 18 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 3 N/A S TER 14236( 2) - 21-Jul-2015 18:01:21 - [ 14] Summary Form for Proposal 14236 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01-JAN-2016:00:00:00, AFTER 01-JUL-2016:00:00:00, ORIENT 103.0180D TO 103.0180 D, ORIENT 146.9847D TO 146.9847 D, ORIENT 206.8769D TO 206.8769 D, ORIENT 295.0003D TO 295.0003 D, PAR 10 WITH 9, PAR 12 WITH 11, PAR 14 WITH 13, PAR 16 WITH 15, PAR 18 WITH 17, PAR 2 WITH 1, PAR 4 WITH 3, PAR 6 WITH 5, PAR 8 WITH 7, POS TARG 0.0000, 0.0000, POS TARG 0.0504, 0.2183, POS TARG 0.0747, 0.1294, POS TARG 0.1005, 0.3305, POS TARG 0.1008, 0.4366, POS TARG 0.1647, 0.0124, POS TARG 0.1740, 0.2350, POS TARG 0.2141, 0.0161, POS TARG 0.2393, 0.1418, POS TARG 0.2644, 0.2344, POS TARG 0.3148, 0.4527, POS TARG 0.3232, 0.1235, POS TARG 0.3293, 0.0248, POS TARG 0.4039, 0.1541, POS TARG 0.4281, 0.0322, POS TARG 0.4784, 0.2505, POS TARG 0.5075, 0.0505, POS TARG 0.5288, 0.4688, POS TARG 0.6080, 0.3810, POS TARG 0.6815, 0.2855, POS TARG 0.8300, 0.1735, SCHED 40%, SEQ 1-4 NON-INT, SEQ 1-6 NON-INT, SEQ 13-16 NON-INT, SEQ 13-18 NON-INT, SEQ 5-8 NON-INT, SEQ 7-12 NON-INT, SEQ 9-12 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, CVN-II-DSPH, HERCULES-DSPH, LEO-IV-DSPH, UMA-I-DSPH ------------------------------------------------------------------------------------------------------------------------------------