11921( 4) - 27-Apr-2010 14:53:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11921 Version: 4 Check-in Time: 27-Apr-2010 14:53:54 STScI Edit Number: 2 Title WFC3 IR PSF Wings ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Linda L. Dressel Space Telescope Science Institute CoI: Dr. Larry D. Petro Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract The IR PSF wings will be evaluated at 5 field points (near the field center and corners) in two filters (F098M and F160W) to check for image stability. Full frame images of a moderately bright, isolated star will be obtained at each field position with a series of increasing exposure times designed to permit construction of a very high SNR PSF with dynamic range sufficient to evaluate the wing intensity to >5 arcsec radius. The images will also permit examination of potential straylight effects, electronic cross-talk and image persistence. This is a repeat of SMOV activity WFC3-26 (program 11439.) The results of the two programs will be compared. The data will be analyzed using the code and techniques described in ISR WFC3 2008-41 (Hartig). Profiles of encircled energy will be compared to those obtained from program 11439. ------------------------------------------------------------------------------------ Observations Description ------------------------ An isolated star will be observed at 5 points on the detector, near the center and the corners, through filters F098M and F160W, as in SMOV proposal 11439. At each location, a STEP timing sequence is used for one filter, a small offset is performed, and another STEP timing sequence is used for the other filter. The timing sequences have been chosen for their dynamic range, and the small offset minimizes the effects of persistence on the PSF (point spread function). For the central location, a larger offset between exposures with the two filters is used to move the target away from the point where the four quadrants meet at the center of the detector. Each PSF is read out by a single amplifier to a radius of at least 5 arcsec. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- The program should be perfomed towards the end of cycle 17. A BETWEEN interval 11921( 4) - 27-Apr-2010 14:53:54 - [ 2] has been chosen based on schedualibility. NOTICE: To avoid affecting subsequent observations with persistence, no WFC3 IR exposures should be scheduled in the 6 hours following the completion of the last exposure in this program. ------------------------------------------------------------------------------------ 11921( 4) - 27-Apr-2010 14:53:54 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GD153 CALIBRATION, RA=12H57M2.3700S +/- 0.1", J2000 V = 13.346 +/- .005 PHOTOMETRIC, POINT DEC=+22D01'56.00" +/- 0.1" SPREAD FUNCTION Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1982.38 -0.0015 -0.1893 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 11921( 4) - 27-Apr-2010 14:53:54 - [ 4] Visit: 01 Visit Requirements: BETWEEN 11-MAY-2010:00:00:00 AND 11-AUG-2010:00:00:00 On Hold Comments: Additional Comments: To avoid affecting subsequent observations with persistence, no WFC3 IR exposures should be scheduled in the 6 hours following the completion of the last exposure in this program. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GD153 WFC3/IR MULTIAC IR-FIX F098M SAMP-SEQ=STEP100, NSAMP=15 1 DEF POS TARG 5, 5; GS ACQ CUM SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ 2 GD153 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP200, NSAMP=15 1 DEF POS TARG -5, -5 CUM ------------------------------------------------------------------------------------------------------------------------------------ 3 GD153 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP200, NSAMP=15 1 DEF POS TARG 38, 32 CUM ------------------------------------------------------------------------------------------------------------------------------------ 4 GD153 WFC3/IR MULTIAC IR-FIX F098M SAMP-SEQ=STEP100, NSAMP=15 1 DEF POS TARG 37, 31 CUM ------------------------------------------------------------------------------------------------------------------------------------ 5 GD153 WFC3/IR MULTIAC IR-FIX F098M SAMP-SEQ=STEP100, NSAMP=15 1 DEF POS TARG 38, -32 CUM ------------------------------------------------------------------------------------------------------------------------------------ 6 GD153 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP200, NSAMP=15 1 DEF POS TARG 37, -31 CUM ------------------------------------------------------------------------------------------------------------------------------------ 7 GD153 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP200, NSAMP=15 1 DEF POS TARG -38, -32 CUM ------------------------------------------------------------------------------------------------------------------------------------ 8 GD153 WFC3/IR MULTIAC IR-FIX F098M SAMP-SEQ=STEP100, NSAMP=15 1 DEF POS TARG -37, -31 CUM ------------------------------------------------------------------------------------------------------------------------------------ 9 GD153 WFC3/IR MULTIAC IR-FIX F098M SAMP-SEQ=STEP100, NSAMP=15 1 DEF POS TARG -38, 32 CUM ------------------------------------------------------------------------------------------------------------------------------------ 10 GD153 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP200, NSAMP=15 1 DEF POS TARG -37, 31 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GD153 1 WFC3/IR MULTIAC IR-FIX F098M none none none none 1 N/A CUM GD153 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 11921( 4) - 27-Apr-2010 14:53:54 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GD153 3 WFC3/IR MULTIAC IR-FIX F160W none none none none 2 N/A CUM GD153 4 WFC3/IR MULTIAC IR-FIX F098M none none none none 2 N/A CUM GD153 5 WFC3/IR MULTIAC IR-FIX F098M none none none none 3 N/A CUM GD153 6 WFC3/IR MULTIAC IR-FIX F160W none none none none 3 N/A CUM GD153 7 WFC3/IR MULTIAC IR-FIX F160W none none none none 4 N/A CUM GD153 8 WFC3/IR MULTIAC IR-FIX F098M none none none none 4 N/A CUM GD153 9 WFC3/IR MULTIAC IR-FIX F098M none none none none 5 N/A CUM GD153 10 WFC3/IR MULTIAC IR-FIX F160W none none none none 5 N/A CUM 11921( 4) - 27-Apr-2010 14:53:54 - [ 6] Summary Form for Proposal 11921 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=15, SAMP-SEQ=STEP100, SAMP-SEQ=STEP200 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 11-MAY-2010:00:00:00 AND 11-AUG-2010:00:00:00, GS ACQ SCENARIO BASE1B3, POS TARG -37, -31, POS TARG -37, 31, POS TARG -38, -32, POS TARG -38, 32, POS TARG -5, -5, POS TARG 37, -31, POS TARG 37, 31, POS TARG 38, -32, POS TARG 38, 32, POS TARG 5, 5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F098M, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GD153 ------------------------------------------------------------------------------------------------------------------------------------