10922( 3) - 05/04/07 11:32 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10922 Version: 3 Check-in Time: 04-May-2007 15:31:54 STScI Edit Number: 0 Title Searching for Signs of a Double Generation of Stars in Galactic Globular Clusters ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Giampaolo Piotto Universita di Padova CoI: Dr. Luigi R. Bedin European Southern Observatory - Germany Y CoI: Dr. Jay Anderson Rice University N CoI: Dr. Ivan R. King University of Washington N CoI: Dr. Santi Cassisi INAF, Osservatorio Astronomico di Teramo N CoI: Mr. Sandro Villanova Universita di Padova N CoI: Dr. Yazan Momany Universita di Padova N CoI: Mr. Antonino Milone Universita di Padova N ------------------------------------------------------------------------------------ Abstract This proposal has been stimulated by new findings of ours that may have a strong impact on the interpretation of globular cluster (GC) stellar populations. In 2004, based on HST data, we have found that the main sequence of the Galactic globular cluster Omega Centauri is split into two sequences; spectroscopic analysis has shown that the only isochrones which are able to fit the combination of color and metallicity of the bluest of the two sequences were younger and greatly enriched in helium. A number of observational facts, and theoretical evidence suggest that our results on Omega Centauri might represent an extreme case of a phenomenon which has also been at work in other GCs. We have selected the most promising GCs to find out whether this hypothesis is correct, and make a strong case for its likelihood and the value of pursuing it. ------------------------------------------------------------------------------------ 10922( 3) - 05/04/07 11:32 - [ 2] Observations Description ------------------------ We intend to measure the main sequence (MS) of these two clusters with the highest possible photometric and astrometric precision, pushing HST to its photometric and astrometric limits (imaging-wise). High-precision photometry is needed to investigate any possible split in the MS due to multiple populations. High-precision astrometry is needed to measure proper motions (using archival data as a first epoch) with the aim of cleaning the CMDs from field stars. Following Anderson and King (ACS/ISR-2006-01), in order minimize photometric errors (due to imperfect modeling of the PSF and the detector's charge- diffusion variations, CTE, etc...), we plan to take the observations with as many large dithers and different orientations as possible. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10922( 3) - 05/04/07 11:32 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2808- STELLAR CLUSTER, RA=09H11M39.8000S +/- 0.1", J2000 V = -9.39+/-0.5 GO9899 GLOBULAR CLUSTER DEC=-64D54'12.00" +/- 0.1" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. 6 MESSIER-054- STELLAR CLUSTER, RA=18H55M12.0000S +/- 0.1", J2000 V = -10.01+/-0.5 WFPC2 GLOBULAR CLUSTER DEC=-30D29'0.00" +/- 0.1" Reference Frame: Other: NED Comments: This object was generated by the targetselector and retrieved from the NED database. 10922( 3) - 05/04/07 11:32 - [ 4] Visit: 11 Visit Priority: Visit Requirements: ORIENT 265.0D TO 275.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 10 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 360 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 360 S POS TARG -2, 2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 360 S POS TARG 6,-6 9899 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2808-GO ACS/WFC ACCUM WFCENTER F475W CR-SPLIT=NO,GAIN=2 1 360 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2808-GO ACS/WFC ACCUM WFCENTER F475W CR-SPLIT=NO,GAIN=2 1 360 S POS TARG -2, 2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 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-2808-GO9899 1 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 4 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 5 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-2808-GO9899 6 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A 10922( 3) - 05/04/07 11:32 - [ 5] Visit: 12 Visit Priority: Visit Requirements: ORIENT 175.0D TO 185.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2808-GO ACS/WFC ACCUM WFCENTER F475W CR-SPLIT=NO,GAIN=2 1 20 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 350 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 350 S POS TARG -2, 2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2808-GO ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO,GAIN=2 1 350 S POS TARG 6,-6 9899 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2808-GO ACS/WFC ACCUM WFCENTER F475W CR-SPLIT=NO,GAIN=2 1 350 S POS TARG 2,-2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2808-GO ACS/WFC ACCUM WFCENTER F475W CR-SPLIT=NO,GAIN=2 1 350 S POS TARG -2, 2 9899 ------------------------------------------------------------------------------------------------------------------------------------ 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-2808-GO9899 1 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-2808-GO9899 2 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 3 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 4 ACS/WFC ACCUM WFCENTER F814W none none none none 1 N/A NGC-2808-GO9899 5 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A NGC-2808-GO9899 6 ACS/WFC ACCUM WFCENTER F475W none none none none 1 N/A 10922( 3) - 05/04/07 11:32 - [ 6] Visit: 13 Visit Priority: Visit Requirements: ORIENT 274.0D TO 284.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG -0.6,-1.3 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 2 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG -0.6,-1.3 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 3 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG -0.75,-0.65 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 4 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG 0.2333,-1 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 5 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG 0.2333,-1 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 6 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG 0.0833,-0.35 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 7 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG 1.2666,-0.6 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 8 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG 1.2666,-0.6 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 9 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG 1.1166, 0.05 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 1 WFPC2 IMAGE WFALL-FI F814W none none none none 1 N/A X MESSIER-054-WFPC2 2 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 3 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 4 WFPC2 IMAGE WFALL-FI F814W none none none none 2 N/A X 10922( 3) - 05/04/07 11:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 5 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 6 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 7 WFPC2 IMAGE WFALL-FI F814W none none none none 3 N/A X MESSIER-054-WFPC2 8 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X MESSIER-054-WFPC2 9 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X 10922( 3) - 05/04/07 11:32 - [ 8] Visit: 14 Visit Priority: Visit Requirements: ORIENT 274.0D TO 284.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG -1.2,-0.2667 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 2 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG -1.2,-0.2667 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 3 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG -1.35, 0.3833 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 4 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG -0.2667,-0.0667 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 5 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG -0.2667,-0.0667 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 6 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG -0.4167, 0.5833 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 7 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG 0.5666, 0.2333 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 8 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG 0.5666, 0.2333 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 9 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG 0.4166, 0.8833 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 1 WFPC2 IMAGE WFALL-FI F814W none none none none 1 N/A X MESSIER-054-WFPC2 2 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 3 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 4 WFPC2 IMAGE WFALL-FI F814W none none none none 2 N/A X 10922( 3) - 05/04/07 11:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 5 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 6 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 7 WFPC2 IMAGE WFALL-FI F814W none none none none 3 N/A X MESSIER-054-WFPC2 8 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X MESSIER-054-WFPC2 9 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X 10922( 3) - 05/04/07 11:32 - [ 10] Visit: 15 Visit Priority: Visit Requirements: ORIENT 274.0D TO 284.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG -0.9, 0.7666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 2 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG -0.9, 0.7666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 3 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG -1.05, 1.4166 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 4 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG -0.0667, 1.1666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 5 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG -0.0667, 1.1666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 6 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG -0.2167, 1.8166 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 7 MESSIER-054 WFPC2 IMAGE WFALL-FIX F814W ATD-GAIN=15,CR-SPLIT=NO 1 500 S POS TARG 0.8666, 1.4666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 8 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 700 S POS TARG 0.8666, 1.4666 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 9 MESSIER-054 WFPC2 IMAGE WFALL-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 800 S POS TARG 0.7166, 2.1166 -WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 1 WFPC2 IMAGE WFALL-FI F814W none none none none 1 N/A X MESSIER-054-WFPC2 2 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 3 WFPC2 IMAGE WFALL-FI F450W none none none none 1 N/A X MESSIER-054-WFPC2 4 WFPC2 IMAGE WFALL-FI F814W none none none none 2 N/A X 10922( 3) - 05/04/07 11:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MESSIER-054-WFPC2 5 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 6 WFPC2 IMAGE WFALL-FI F450W none none none none 2 N/A X MESSIER-054-WFPC2 7 WFPC2 IMAGE WFALL-FI F814W none none none none 3 N/A X MESSIER-054-WFPC2 8 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X MESSIER-054-WFPC2 9 WFPC2 IMAGE WFALL-FI F450W none none none none 3 N/A X 10922( 3) - 05/04/07 11:32 - [ 12] Summary Form for Proposal 10922 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFCENTER WFALL-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO GAIN=2 ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 265.0D TO 275.0 D; POS TARG 2,-2; POS TARG -2, 2; POS TARG 6,-6; ORIENT 175.0D TO 185.0 D; ORIENT 274.0D TO 284.0 D; POS TARG -0.6,-1.3; POS TARG -0.75,-0.65; POS TARG 0.2333,-1; POS TARG 0.0833,-0.35; POS TARG 1.2666,-0.6; POS TARG 1.1166, 0.05; POS TARG -1.2,-0.2667; POS TARG -1.35, 0.3833; POS TARG -0.2667,-0.0667; POS TARG -0.4167, 0.5833; POS TARG 0.5666, 0.2333; POS TARG 0.4166, 0.8833; POS TARG -0.9, 0.7666; POS TARG -1.05, 1.4166; POS TARG -0.0667, 1.1666; POS TARG -0.2167, 1.8166; POS TARG 0.8666, 1.4666; POS TARG 0.7166, 2.1166; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F475W F450W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-2808-GO9899 MESSIER-054-WFPC2 ------------------------------------------------------------------------------------------------------------------------------------