11904( 2) - 16-Apr-2009 17:02:51 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11904 Version: 2 Check-in Time: 16-Apr-2009 17:02:51 STScI Edit Number: 0 Title UVIS Droplets ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jasonjot S. Kalirai Space Telescope Science Institute CoI: Dr. Susana Deustua Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract To characterize the effects of the contamination (i.e., droplets) on the UVIS window, we will observe a star cluster in three wide band filters (F225W, F555W, and F814W) as well as a narrow band filter (F502N) and step the stars in the cluster across randomly located droplets. The step size is 20 pixels, and we execute a five point line dither for each filter. This should provide for observations both on and off the droplets, for the same star. Internal flat fields are also obtained, but, due to the high f/# of the internal calibration system, the flats will be of limited utility, but will serve to map and crudely track any changes in the droplets. The cluster needs to contain both hot and cool stars, and therefore we select NGC 6752, a nearby globular with a hot horizontal branch. Note, although the total population of HB stars may be larger in systems such as NGC 2419, NGC 6715, and NGC 2808, those clusters are much further away and will not provide a high density of stars over the global image (the droplets are located over the entire frame). There will be three visits (initial, 7 days later, and 30 days later), with each visit requiring 4 orbits. The total program thus requires 12 orbits total. ------------------------------------------------------------------------------------ Observations Description ------------------------ Primary Goal: ---------------------------------------------------------------------- This proposal will measure the brightness of stars as they pass through the UVIS droplets to gauge the effect on the photometry. The relative photometry must be accurate to better than 1% in order to track the variations due to position within a droplet. All visits should be performed at the same orientation and using the same guide stars, in order to scan the stars across the same positions on the detector each time. This will minimize any other systematic errors that could dominate the characterization. Target ----- A star cluster is ideal for this study as it provides a large number of stars spaced over the detector. As we wish to characterize the affect of the droplets on photometry in both blue and red filters, we require a cluster with both hot and cool stars over the entire field of view. NGC 6752 is a nearby globular with a hot horizontal branch at V = 14 - 16, and a rich main-sequence beginning at V = 17. A star cluster is also ideal for testing the effects of the droplets 11904( 2) - 16-Apr-2009 17:02:51 - [ 2] on large and small aperture photometry. Observations: ----------- We select a blue (F225W), visible (F555W), and redder (F814W) filter to characterize the effects of the droplets with wavelength, as well as narrowband filter (F502N). The observations in F555W and F814W require 1 one orbit each given the five point line dither (in X) to move the star across the droplet features. Each step is 20 pixels and is executed with a simple UVIS-DITHER-LINE pattern. The exposure time (550 s) is chosen to fill each orbit and will provide high S/N observations of a large part of the main-sequence of the cluster. The observations in F225W are much shallower as the horizontal branch will saturate quickly, and therefore are also coupled with longer F502N observations at each dither point to maximize orbit efficiency. The combined dither pattern for this set of observations (6 points) requires two orbits. The first visit (01) consists of these four orbits of observations. At the end of this visit, we will obtain an internal flat field in the four filters to track any changes in the droplets. Due to the high f# of the beam, this may not be very useful. The exposure times for the Tungsten bulb (redder filters) and D2 bulb (F225W) are taken from ISR-2008-21. A second D2 exposure is added in case the lamp delays in firing, which is does occasionally. Visit 02 is a repeat of the above set executed 1-2 weeks after the initial observations to map the variations of the droplets with time. Visit 03 is a second repeat of the above set executed 2-6 weeks after Visit 02 days after the initial observations to map the variations of the droplets with time. In total, the program requires three visits each with 4 orbits, for 12 external orbits. An additional 3 internal orbits are required for the internal flat field observations. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- The same orientation and same guide star is required for all observations. ------------------------------------------------------------------------------------ 11904( 2) - 16-Apr-2009 17:02:51 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6752 STELLAR CLUSTER, RA=19H10M51.8000S +/- 0.1", J2000 V = 17 +/- 0.1 GLOBULAR CLUSTER DEC=-59D58'55.00" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 11904( 2) - 16-Apr-2009 17:02:51 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 5 Point_Spacing 0.8 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 6 Point_Spacing .8 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11904( 2) - 16-Apr-2009 17:02:51 - [ 5] Visit: 01 Visit Requirements: 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-6752 WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 120 S PATTERN 4 1-2 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6752 WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 670 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6752 WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 550 S PATTERN 3 3 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6752 WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 550 S PATTERN 3 4 S ------------------------------------------------------------------------------------------------------------------------------------ 5 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 6 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 7 TUNGSTEN WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 14.4 S S ------------------------------------------------------------------------------------------------------------------------------------ 8 TUNGSTEN WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 742.1 S S ------------------------------------------------------------------------------------------------------------------------------------ 9 TUNGSTEN WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 2 S 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-6752 1 WFC3/UVI ACCUM UVIS F225W 1 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 2 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 3 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 4 none none none 2 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 6] 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-6752 1 WFC3/UVI ACCUM UVIS F225W 5 none none none 2 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 6 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 1 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 2 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 3 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 4 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 5 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 6 none none none 2 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 1 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 2 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 3 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 4 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 5 none none none 3 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 1 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 2 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 3 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 4 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 5 none none none 4 N/A S DEUTERIUM 5 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S DEUTERIUM 6 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S TUNGSTEN 7 WFC3/UVI ACCUM UVIS F555W none none none none 5 N/A S TUNGSTEN 8 WFC3/UVI ACCUM UVIS F502N none none none none 5 N/A S TUNGSTEN 9 WFC3/UVI ACCUM UVIS F814W none none none none 5 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 7] Visit: 02 Visit Requirements: SAME ORIENT AS 01; AFTER 01 BY 6 D TO 14 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-6752 WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 120 S PATTERN 4 1-2 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6752 WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 670 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6752 WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 550 S PATTERN 3 3 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6752 WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 550 S PATTERN 3 4 S ------------------------------------------------------------------------------------------------------------------------------------ 5 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 6 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 7 TUNGSTEN WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 14.4 S S ------------------------------------------------------------------------------------------------------------------------------------ 8 TUNGSTEN WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 742.1 S S ------------------------------------------------------------------------------------------------------------------------------------ 9 TUNGSTEN WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 2 S 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-6752 1 WFC3/UVI ACCUM UVIS F225W 1 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 2 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 3 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 4 none none none 2 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 8] 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-6752 1 WFC3/UVI ACCUM UVIS F225W 5 none none none 2 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 6 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 1 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 2 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 3 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 4 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 5 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 6 none none none 2 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 1 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 2 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 3 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 4 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 5 none none none 3 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 1 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 2 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 3 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 4 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 5 none none none 4 N/A S DEUTERIUM 5 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S DEUTERIUM 6 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S TUNGSTEN 7 WFC3/UVI ACCUM UVIS F555W none none none none 5 N/A S TUNGSTEN 8 WFC3/UVI ACCUM UVIS F502N none none none none 5 N/A S TUNGSTEN 9 WFC3/UVI ACCUM UVIS F814W none none none none 5 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 9] Visit: 03 Visit Requirements: SAME ORIENT AS 01; AFTER 02 BY 14 D TO 45 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-6752 WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 120 S PATTERN 4 1-2 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6752 WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 670 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6752 WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 550 S PATTERN 3 3 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6752 WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 550 S PATTERN 3 4 S ------------------------------------------------------------------------------------------------------------------------------------ 5 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 6 DEUTERIUM WFC3/UVI ACCUM UVIS F225W CR-SPLIT=NO 1 16.6 S S ------------------------------------------------------------------------------------------------------------------------------------ 7 TUNGSTEN WFC3/UVI ACCUM UVIS F555W CR-SPLIT=NO 1 14.4 S S ------------------------------------------------------------------------------------------------------------------------------------ 8 TUNGSTEN WFC3/UVI ACCUM UVIS F502N CR-SPLIT=NO 1 742.1 S S ------------------------------------------------------------------------------------------------------------------------------------ 9 TUNGSTEN WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 2 S 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-6752 1 WFC3/UVI ACCUM UVIS F225W 1 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 2 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 3 none none none 1 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 4 none none none 2 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 5 none none none 2 N/A S NGC-6752 1 WFC3/UVI ACCUM UVIS F225W 6 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 1 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 2 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 3 none none none 1 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 4 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 5 none none none 2 N/A S NGC-6752 2 WFC3/UVI ACCUM UVIS F502N 6 none none none 2 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 1 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 2 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 3 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 4 none none none 3 N/A S NGC-6752 3 WFC3/UVI ACCUM UVIS F555W 5 none none none 3 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 1 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 2 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 3 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 4 none none none 4 N/A S NGC-6752 4 WFC3/UVI ACCUM UVIS F814W 5 none none none 4 N/A S DEUTERIUM 5 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S DEUTERIUM 6 WFC3/UVI ACCUM UVIS F225W none none none none 5 N/A S TUNGSTEN 7 WFC3/UVI ACCUM UVIS F555W none none none none 5 N/A S TUNGSTEN 8 WFC3/UVI ACCUM UVIS F502N none none none none 5 N/A S TUNGSTEN 9 WFC3/UVI ACCUM UVIS F814W none none none none 5 N/A S 11904( 2) - 16-Apr-2009 17:02:51 - [ 11] Summary Form for Proposal 11904 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 6 D TO 14 D, AFTER 02 BY 14 D TO 45 D, PATTERN 3 3, PATTERN 3 4, PATTERN 4 1-2, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F225W, F502N, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names DEUTERIUM, NGC-6752, TUNGSTEN ------------------------------------------------------------------------------------------------------------------------------------