5897( 6) - 08/10/95 15:12 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5897 Version: 6 Check-in Date: ********** 1.Proposal Title: Ages for the Oldest Star Clusters in the Large Magellanic Cloud ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Stellar Populations GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Michael Bolte UCO/Lick Observatory CoI: Howard E. Bond Space Telescope Science Institute N CoI: James E. Hesser Dominion Astrophysical Observatory N CoI: Claudia M. de Oliveira European Southern Observatory N CoI: Harvey B. Richer University of British Columbia N CoI: Peter B. Stetson Dominion Astrophysical Observatory N CoI: Don A. VandenBerg University of Victoria N ------------------------------------------------------------------------------------ 6. Abstract We propose WFPC2 observations that will provide color- magnitude diagrams reaching to below the main-sequence turnoffs in 7 of the oldest star clusters in the Large Magellanic Cloud (LMC)Null. These data will allow a direct comparison of the ages of these clusters with those of Milky Way globular clusters. The primary goals are: a) to determine if the initial bursts of star formation occurred at the same time in both galaxies, and b) to determine if all of the clusters in the LMC with Fe/H<-1.7 have the same ages (indicating that the first epoch of star formation in the LMC occurred during a free-fall collapse), or if they have a range in ages (indicating a non-monolithic collapse or possibly a series of mergers that formed the LMC)Null. Our Cycle 4 observations of globular clusters in the outer halo of the Milky Way demonstrate that the proposed LMC observations are straightforward for HST, even though impossible from the ground. For the first time, we be able to make a direct comparison of the ages of the ancestral components of two galaxies of widely differing mass and Hubble type. ------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 2] Observations Description ------------------------ The observing program will be a straightforward series of WFPC2 exposures, in the standard HST V (F555W) and I (F814W) filters, on seven globular clusters in the Large Magellanic Cloud. The observing strategy is based on the precision actually achieved in our Cycle 4 observations of distant Galactic globular clusters, and the LMC exposure times are directly scaled from the Cycle 4 program. We have found that it is sufficient to observe only a single WFPC2 field, with the PC chip located at the center of the cluster, in order to measure enough stars to attain our program goals. Note also that we will continue to use small pointing offsets (of order 1.67 WF pixels) between individual exposures to allow us to overcome undersampling problems in the three WF chips. This proposal makes extremely efficient use of HST because 6 of the 7 targets lie in the continuous viewing zone. Our observing plan will produce data matching the excellent quality of the Cycle 4 observations of Pal 4 and NGC 2419. We thus arrive at the following exposure sequence (with overhead factored in, and filling out the integer number of orbits with extra exposure time) for each of the six targets lying in the CVZNull. A 96-minute visibility period per orbit and no guide-star re-acquisitions are assumed. Orbit 1. Initial guide-star acquisition, followed by two 260-sec exposures in F555W, two 260-sec exposures in F814W, three 1000-sec exposures in F555W (the third extends into to Orbit 2) and four 1000 second exposures in F814W. For the one remaining cluster, which is not in the CVZ, we have 59 minutes of visibility per orbit. This one target therefore requires 3 orbits, as follows: Orbit 1. Initial guide-star aquisition, followed by one 260-sec exposure in F555W, two 260-sec exposures in F814W and one 1100-sec exposure in F814W. Orbit 2. Two 800-sec and one 700-sec exposures in F814W, Orbit 3: two 800-sec exposures and one 700-sec exposure in F55W. The entire program thus requires 15 orbits. Real Time Justification ----------------------- Six of our seven targets are in the continuous-viewing zone. This program therefore takes very significant advantage of the increased HST efficiency that comes from using the CVZ. We have an ongoing battery of ground-based programs in support of this project: 1. As we did for our Cycle 4 outer- halo Galactic globular clusters, we will observe the target clusters from the ground during the same observing runs when we are establishing fiducial V, V-I CMD studies of near-halo clusters. This will allow a self-consistent calibration of the entire set of clusters now being observed as part of our comprehensive halo- and LMC- ages program. 2. A large number of clusters with R_G between 5 and 50 kpc have been, or will be, observed in V and I from the ground to establish the basis for our age survey of the Galactic and LMC halos. 3. The stellar-evolution and stellar-atmosphere models on which we depend are constantly being improved. In particular an effort is underway to produce and test predicted stellar colors and magnitudes in the HST V and I bandpasses. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: , ------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1466 STELLAR CLUSTER, RA=3H 44M 33.0S +/- 1", DEC=-71D J2000 V = 27.5 GLOBULAR CLUSTER 40' 14" +/- 1", PLATE-ID=061E B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 2 NGC1786 STELLAR CLUSTER, RA=4H 59M 07.4S +/- 1", DEC=-67D J2000 V = 27.5 GLOBULAR CLUSTER 44' 45" +/- 1", PLATE-ID=05ZW B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 3 NGC1841 STELLAR CLUSTER, RA=4H 45M 23.4S +/- 1", DEC=-83D J2000 V = 27.5 GLOBULAR CLUSTER 59' 58" +/- 1", PLATE-ID=04BP B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 4 NGC2210 STELLAR CLUSTER, RA=6H 11M 31.4S +/- 1", DEC=-69D J2000 V = 27.5 GLOBULAR CLUSTER 07' 22" +/- 1", PLATE-ID=014D B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 5 NGC2257 STELLAR CLUSTER, RA=6H 30M 12.6S +/- 1", DEC=-64D J2000 V = 27.5 GLOBULAR CLUSTER 19' 39" +/- 1", PLATE-ID=00MS B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 6 HODGE11 STELLAR CLUSTER, RA=6H 14M 22.2S +/- 1", DEC=-69D J2000 V = 27.5 GLOBULAR CLUSTER 50' 48" +/- 1", PLATE-ID=014D B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 7 RETICULUM STELLAR CLUSTER, RA=4H 36M 03.0S +/- 1", DEC=-58D J2000 V = 27.5 GLOBULAR CLUSTER 51' 27" +/- 1", PLATE-ID=02IC B-V = 0.6 Comments: THE TARGET FLUX LEVEL REFERS TO THE FAINT MAIN- SEQUENCE STARS IN THE CLUSTER. 5897( 6) - 08/10/95 15:12 - [ 5] Visit: 01 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC1466 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC1466 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC1466 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1466 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC1466 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC1466 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC1466 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC1466 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC1466 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 6] Visit: 02 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC1786 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC1786 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC1786 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1786 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC1786 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC1786 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC1786 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC1786 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC1786 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 7] Visit: 03 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 HODGE11 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 HODGE11 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 HODGE11 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 HODGE11 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 HODGE11 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 HODGE11 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 HODGE11 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 HODGE11 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 HODGE11 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 8] Visit: 04 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC2210 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC2210 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC2210 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC2210 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC2210 WFPC2 IMAGE PC1-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC2210 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC2210 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC2210 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC2210 WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 9] Visit: 05 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC2257 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC2257 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC2257 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC2257 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC2257 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC2257 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC2257 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC2257 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC2257 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 10] Visit: 06 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 RETICULUM WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 2 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 RETICULUM WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 RETICULUM WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 RETICULUM WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 RETICULUM WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 1000S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 RETICULUM WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 RETICULUM WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 RETICULUM WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 RETICULUM WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1000S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 11] Visit: 07 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC1841 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 260S POS TARG 0.00, 0.00 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC1841 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 2 260S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC1841 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1100S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1841 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 800S POS TARG 0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC1841 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 700S POS TARG 0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC1841 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 800S POS TARG 0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC1841 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 800S POS TARG -0.038, 0.228 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC1841 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 800S POS TARG -0.076, 0.152 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC1841 WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 1 700S POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ 5897( 6) - 08/10/95 15:12 - [ 12] Summary Form for Proposal 5897 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Stellar Populations ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ POS TARG 0.00, 0.00 SAME POS AS 11 POS TARG 0.076, 0.076 POS TARG 0.076, 0.152 POS TARG 0.038, 0.228 POS TARG -0.038, 0.228 POS TARG -0.076, 0.152 POS TARG -0.076, 0.076 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1466 NGC1786 HODGE11 NGC2210 NGC2257 RETICULUM NGC1841 ------------------------------------------------------------------------------------------------------------------------------------