15063( 14) - 07-Jan-2019 16:05:50 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15063 Version: 14 Check-in Time: 07-Jan-2019 16:05:50 STScI Edit Number: 11 Title The elusive old stellar halo of low-mass spirals: RR Lyrae stars in NGC55 ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Edouard Bernard Observatoire de la Cote d'Azur Y CoI: Dr. Matteo Monelli Instituto de Astrofisica de Canarias Y CoI: Dr. Carme Gallart Instituto de Astrofisica de Canarias N CoI: Prof. Giuseppe Bono Universita di Roma Tor Vergata N CoI: Dr. Giuliana Fiorentino INAF, Osservatorio Astronomico di Bologna N CoI: Dr. Peter B. Stetson Dominion Astrophysical Observatory N CoI: Dr. Alistair R. Walker National Optical Astronomy Observatory - N CTIO CoI: Dr. Massimo Dall'Ora Osservatorio Astronomico di Capodimonte N (OAC) CoI: Prof. Annette Ferguson University of Edinburgh, Institute for N Astronomy CoI: Dra. Clara Eugenia National Optical Astronomy Observatory - N Martinez-Vazquez CTIO ------------------------------------------------------------------------------------ Abstract Spiral galaxies dominate the stellar mass density in the Universe, yet the details of their formation and evolution are still greatly debated. The simulations based on the current cosmological model show that these galaxies grow in mass through accretion and mergers. One of the consequence of this galaxy assembly process is the formation of an old, metal-poor stellar halo. However, to date the presence of a spheroidal component in low-mass spirals is elusive and controversial, mostly due to the difficulty to detect such a faint, diffuse component amid the foreground/background contamination. We propose a novel method to detect and characterize such a halo in the nearby, edge-on spiral galaxy NGC 55, that by-passes these limitations by using the pulsational properties of its RR Lyrae stars. These observations will allow us to i) firmly establish the presence of an old stellar halo, ii) quantify its early chemical evolution, and iii) determine the nature of its building blocks. We will use the resulting deep color-magnitude diagrams reaching 1.5 magnitudes below the horizontal-branch to test halo and thick disk formation models. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this proposal is to obtain accurate light curves of RR Lyrae variable stars and a relatively deep color-magnitude diagram for a field in the halo of the nearby dwarf spiral galaxy NGC55. The two cameras used (ACS and WFC3) will probe slightly different radial distances from the center of the galaxy, hence the orientation is important. Our visits span 2 orbits. For the first orbit, one F475W and one F814W exposure 15063( 14) - 07-Jan-2019 16:05:50 - [ 2] (with no CR-splits) are obtained with the ACS. For the second orbit, one F475W and one F814W exposure are obtained at the same pointing, but the order of the filters is reversed to provide better sampling of RR Lyrae variable star light curves. The images in the same visit are kept with the same POS TARG in order to have two images in the same position, which is supposed to help in the CR removal. Small ditherings are performed between visits in order to remove hot pixels and to smooth the detector response. We don't intend to cover the interchip gap. Ditherings are performed using POS-TARG, and following the basic UDF dither pattern, shifting the pointings by ~2 pix. Coordinated parallel exposures following the same strategy with WFC3 are requested. The first visit is requested within a given range of orientations. This range has been chosen to cover a range of distances from the center of the galaxy and to avoid bright stars in the main and the parallel field. Subsequent visits are requested to be obtained with the same ORIENT as the first visit, to maximize the sky area covered at full depth both in the prime and the parallel fields. Since the time sampling is crucial, we request the visits to be executed sequentially sometime after 4 hours but within 3 days of the previous visit, and grouped within a maximum time span of 5 days. We also request that visits separated by 8 orbits or multiples of 8 orbits be avoided. SAA impacted orbits are also to be avoided. This strategy proved successful in our previous programs (PID=13028, 13739 & 10505). This will ensure optimal sampling of the light curves of the RR Lyrae variable stars, which are the main targets of these observations. ------------------------------------------------------------------------------------ 15063( 14) - 07-Jan-2019 16:05:50 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-55 GALAXY, HALO RA=00H15M18.1128S +/- 0.1", J2000 V = 7.87 DEC=-39D01'52.94" +/- 0.1" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15063( 14) - 07-Jan-2019 16:05:50 - [ 4] Visit: 01 (ngc55-vis1) Visit Requirements: ORIENT 30D TO 85 D On Hold Comments: Additional Comments: This is the first visit to our requested field. We request a range in orientations in this first visit with the same orientation requested in subsequent visits to this target. This requirement will ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. We have requested timing constraints such that (1) all visits to NGC55 be executed sequentially sometime after 4 hours but within 3 days of the previous visit, and (2) all visits to NGC55 should be executed within 5 days. In addition, we also request that visits separated by 8 orbits or multiples of 8 orbits be avoided. SAA impacted orbits are to be avoided. These timing constraints provide optimal sampling of RR Lyrae light curves. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S GS ACQ SCENARIO BASE1B3; (1400 S) PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.085, 0.105; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.085, 0.105 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 S) ------------------------------------------------------------------------------------------------------------------------------------ 15063( 14) - 07-Jan-2019 16:05:50 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 6] Visit: 02 (ngc55-vis2) Visit Requirements: SAME ORIENT AS 01; AFTER 01 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.148, 0.086; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.148, 0.086 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.233, 0.191; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.233, 0.191 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 8] Visit: 03 (ngc55-vis3) Visit Requirements: SAME ORIENT AS 01; AFTER 02 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.222, 0.240; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.222, 0.240 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.307, 0.345; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.307, 0.345 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 9] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 10] Visit: 04 (ngc55-vis4) Visit Requirements: SAME ORIENT AS 01; AFTER 03 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.074, 0.154; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.074, 0.154 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.159, 0.259; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.159, 0.259 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 11] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 12] Visit: 05 (ngc55-vis5) Visit Requirements: SAME ORIENT AS 01; AFTER 04 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.125, 0.165; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.125, 0.165 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.130, 0.330; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.130, 0.330 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 14] Visit: 06 (ngc55-vis6) Visit Requirements: SAME ORIENT AS 01; AFTER 05 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.283, 0.141; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.283, 0.141 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.198, 0.161; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.198, 0.161 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 15] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 16] Visit: 07 (ngc55-vis7) Visit Requirements: SAME ORIENT AS 01; AFTER 06 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.357, 0.395; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.357, 0.395 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.272, 0.290; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.272, 0.290 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 17] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 18] Visit: 08 (ngc55-vis8) Visit Requirements: SAME ORIENT AS 01; AFTER 07 BY 4 H TO 3 D On Hold Comments: Additional Comments: The orientation must be the same as in Visit 1 to ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. 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 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1400 S POS TARG 0.189, 0.209; (1400 S) GS ACQ SCENARIO BASE1B3; PAR 3-4 WITH 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1130 S POS TARG 0.189, 0.209 (1130 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1490 S S ER (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1245 S S ER (1245 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.074, 0.154; see below PAR 7-8 WITH 5-6 (1212 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.074, 0.154 see below (1490 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1312 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1540 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-55 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A ANY 3 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 19] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 5 ACS/WFC ACCUM WFCENTER F814W none none none none 2 1212.0 S NGC-55 6 ACS/WFC ACCUM WFCENTER F475W none none none none 2 1490.0 S ANY 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 1312.0 S S TER ANY 8 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 2 1540.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 20] Visit: Z1 (HOPRngc55vis-1) Visit Requirements: ORIENT 30D TO 85 D On Hold Comments: Additional Comments: This is the first visit to our requested field. We request a range in orientations in this first visit with the same orientation requested in subsequent visits to this target. This requirement will ensure that the parallel WFC3 fields of view will match exactly across all visits to this target. We have requested timing constraints such that (1) all visits to NGC55 be executed sequentially sometime after 4 hours but within 3 days of the previous visit, and (2) all visits to NGC55 should be executed within 5 days. In addition, we also request that visits separated by 8 orbits or multiples of 8 orbits be avoided. SAA impacted orbits are to be avoided. These timing constraints provide optimal sampling of RR Lyrae light curves. 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 NGC-55 ACS/WFC ACCUM WFCENTER F814W 1 1222 S POS TARG 0.085, 0.105; see below PAR 3-4 WITH 1-2 (1095 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-55 ACS/WFC ACCUM WFCENTER F475W 1 1500 S POS TARG 0.085, 0.105 see below (1373 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/UVI ACCUM UVIS-CENT F814W 1 1322 S S ER see below (1220 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F475W 1 1550 S S ER see below (1448 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-55 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 1095.0 S NGC-55 2 ACS/WFC ACCUM WFCENTER F475W none none none none 1 1373.0 S ANY 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 1220.0 S S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F475W none none none none 1 1448.0 S S TER 15063( 14) - 07-Jan-2019 16:05:50 - [ 21] Summary Form for Proposal 15063 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 4 H TO 3 D, AFTER 02 BY 4 H TO 3 D, AFTER 03 BY 4 H TO 3 D, AFTER 04 BY 4 H TO 3 D, AFTER 05 BY 4 H TO 3 D, AFTER 06 BY 4 H TO 3 D, AFTER 07 BY 4 H TO 3 D, GS ACQ SCENARIO BASE1B3, ORIENT 30D TO 85 D, PAR 3-4 WITH 1-2, PAR 7-8 WITH 5-6, POS TARG 0.074, 0.154, POS TARG 0.085, 0.105, POS TARG 0.125, 0.165, POS TARG 0.130, 0.330, POS TARG 0.148, 0.086, POS TARG 0.159, 0.259, POS TARG 0.189, 0.209, POS TARG 0.198, 0.161, POS TARG 0.222, 0.240, POS TARG 0.233, 0.191, POS TARG 0.272, 0.290, POS TARG 0.283, 0.141, POS TARG 0.307, 0.345, POS TARG 0.357, 0.395, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, NGC-55 ------------------------------------------------------------------------------------------------------------------------------------