13474( 8) - 12-Sep-2013 15:05:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13474 Version: 8 Check-in Time: 12-Sep-2013 15:05:14 STScI Edit Number: 0 Title Imaging Polarimetry of the 2013 Comet ISON with ACS: A Study of the Heterogeneous Coma ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Dean C. Hines Space Telescope Science Institute Y CoI: Dr. Gorden Videen Space Science Institute N CoI: Dr. Yuri G. Shkuratov Kharkiv National University N CoI: Dr. Evgenij Zubko University of Helsinki N CoI: Dr. Karri Muinonen University of Helsinki N CoI: Dr. Michael L. Sitko Space Science Institute N CoI: Dr. Matthew M Knight Lowell Observatory N CoI: Dr. Carey M Lisse The Johns Hopkins University Applied N Physics Laboratory CoI: Dr. Derek Hammer Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract The great comet of 2013, currently referred to as Comet C/2012 S1 (ISON), is anticipated to be a unique observational opportunity. Comet ISON is a sungrazer on a nearly parabolic trajectory, similar to that of the Great Comet of 1680, and likely carries pristine material dating to the time of the solar-system formation. Recent polarimetric observations of other comets have found that different regions of the coma produce different polarimetric light-scattering responses, indicating that different portions of the coma contain different materials. The presence of a strongly negatively polarizing circumnucleus halo region that has been observed very near the nucleus of several comets suggest a depletion of absorbing, carbonaceous particles in this region. High spatial-resolution ACS polarimetric images of Comet ISON not only can be used to place bounds on the material constituents of different regions of its coma, but can also be used to explore its dynamics and acquire an understanding of the radiation-coma interaction that accounts for coma heterogeneities. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use the WFC with the following polarizer/filter combinations POL*V/F606W and POL*V/F775W. This selection of filters yields good wavelength coverage for constructing the phase/polarization diagram. For ACS, all wavelengths shortward of 6000 ang are potentially contaminated with molecular line emission, while F814W contains a strong CN bands at 9200 ang. Molecular emission will be unpolarized, which can potentially dilute the scattered light, artificially reducing the measured degree of polarization. The F775W filter, with POLV optics offers the cleanest portion of the comet spectrum. The F606W filter is chosen because it provides a long baseline relative to the F775W filter for assessing the wavelength dependence of scattering, while avoiding the strong contamination from the molecular species CN, C2, and C3. Some contamination from C2 will still be present. Fortunately, these are routinely 13474( 8) - 12-Sep-2013 15:05:14 - [ 2] measured by multiple observers as part of optical spectroscopy (e.g., Cochran, Fink) and photometry (e.g., Schleicher) programs, and we will used published values acquired near the times of our observations to estimate the dilution in the scattered light at each epoch. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13474( 8) - 12-Sep-2013 15:05:14 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: ISON ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET Comet C/2012 S1 (ISON) ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=0.01249800996917281, E=1.000003928928245, I=61.8930651794545 , O=295.7315575148069, W=345.5130650822808 , T=28-NOV-2013:18:49:00, TTimeScale=TDB, EQUINOX=J2000, EPOCH=08-JAN-2013:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 7.1 +/- 6.8 Target Ephemeris is from JPL Small-Body Database Browser. The solution date is 2013-Aug-26, and is JPL#35 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 13474( 8) - 12-Sep-2013 15:05:14 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 1 Line_Spacing 1.2 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13474( 8) - 12-Sep-2013 15:05:14 - [ 5] Visit: 01 Visit Requirements: SCHED 40%; BETWEEN 26-OCT-2013:00:00:00 AND 05-DEC-2013:00:00:00 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 PATTERN 2 1-3 POL120V S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 POL60V S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 POL0V S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ISON ACS/WFC ACCUM WFC F606W, 1 75 S (300 PATTERN 2 4-6 POL0V S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ISON ACS/WFC ACCUM WFC F606W, 1 75 S (300 POL60V S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ISON ACS/WFC ACCUM WFC F606W, 1 75 S (300 POL120V 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 1 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 3 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL120V ISON 2 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 3 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL60V ISON 3 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL0V 13474( 8) - 12-Sep-2013 15:05:14 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 3 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 3 none none none 2 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 2 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL0V ISON 5 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 2 none none none 3 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL60V ISON 6 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 2 none none none 3 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL120V 13474( 8) - 12-Sep-2013 15:05:14 - [ 7] Visit: 02 Visit Requirements: SCHED 30%; BETWEEN 18-DEC-2013:00:00:00 AND 13-JAN-2014:00:00:00 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 PATTERN 2 1-3 POL120V S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 POL60V S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ISON ACS/WFC ACCUM WFC F775W, 1 70 S (280 POL0V S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ISON ACS/WFC ACCUM WFC F606W, 1 73 S (292 PATTERN 2 4-6 POL0V S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ISON ACS/WFC ACCUM WFC F606W, 1 73 S (292 POL60V S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ISON ACS/WFC ACCUM WFC F606W, 1 73 S (292 POL120V 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 1 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 3 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL120V ISON 2 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 3 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL60V ISON 3 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL0V 13474( 8) - 12-Sep-2013 15:05:14 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 3 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 3 none none none 2 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 4 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 2 none none none 2 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL0V ISON 5 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 2 none none none 3 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL60V ISON 6 ACS/WFC ACCUM WFC F606W, 1 none none none 2 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 2 none none none 3 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 3 none none none 3 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 4 none none none 3 N/A POL120V 13474( 8) - 12-Sep-2013 15:05:14 - [ 9] Visit: 03 Visit Requirements: BETWEEN 10-MAR-2014:00:00:00 AND 14-APR-2014:00:00:00 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ISON ACS/WFC ACCUM WFC F775W, 1 490 S PATTERN 2 1-3 POL120V (1960 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ISON ACS/WFC ACCUM WFC F775W, 1 490 S POL60V (1960 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ISON ACS/WFC ACCUM WFC F775W, 1 490 S POL0V (1960 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ISON ACS/WFC ACCUM WFC F606W, 1 492 S PATTERN 2 4-6 POL0V (1968 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ISON ACS/WFC ACCUM WFC F606W, 1 492 S POL60V (1968 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ISON ACS/WFC ACCUM WFC F606W, 1 492 S POL120V (1968 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 1 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 2 none none none 1 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 3 none none none 2 N/A POL120V ISON 1 ACS/WFC ACCUM WFC F775W, 4 none none none 3 N/A POL120V ISON 2 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 2 none none none 2 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 3 none none none 2 N/A POL60V ISON 2 ACS/WFC ACCUM WFC F775W, 4 none none none 3 N/A POL60V ISON 3 ACS/WFC ACCUM WFC F775W, 1 none none none 1 N/A POL0V 13474( 8) - 12-Sep-2013 15:05:14 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ISON 3 ACS/WFC ACCUM WFC F775W, 2 none none none 2 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 3 none none none 3 N/A POL0V ISON 3 ACS/WFC ACCUM WFC F775W, 4 none none none 3 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 1 none none none 4 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 2 none none none 4 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 3 none none none 5 N/A POL0V ISON 4 ACS/WFC ACCUM WFC F606W, 4 none none none 6 N/A POL0V ISON 5 ACS/WFC ACCUM WFC F606W, 1 none none none 4 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 2 none none none 5 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 3 none none none 5 N/A POL60V ISON 5 ACS/WFC ACCUM WFC F606W, 4 none none none 6 N/A POL60V ISON 6 ACS/WFC ACCUM WFC F606W, 1 none none none 4 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 2 none none none 5 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 3 none none none 6 N/A POL120V ISON 6 ACS/WFC ACCUM WFC F606W, 4 none none none 6 N/A POL120V 13474( 8) - 12-Sep-2013 15:05:14 - [ 11] Visit: A1 Visit Requirements: SEQ A1, A2, A3, A4 WITHIN 1 D On Hold Comments: Additional Comments: This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. 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 BIAS ACS/WFC ACCUM WFC1-2K DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 6 none 1 N/A 13474( 8) - 12-Sep-2013 15:05:14 - [ 12] Visit: A2 Visit Requirements: On Hold Comments: Additional Comments: This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. 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 BIAS ACS/WFC ACCUM WFC1-2K DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 6 none 1 N/A 13474( 8) - 12-Sep-2013 15:05:14 - [ 13] Visit: A3 Visit Requirements: On Hold Comments: Additional Comments: This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. 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 BIAS ACS/WFC ACCUM WFC1-2K DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 6 none 1 N/A 13474( 8) - 12-Sep-2013 15:05:14 - [ 14] Visit: A4 Visit Requirements: GROUP A4, 03 WITHIN 14D On Hold Comments: Additional Comments: This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. 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 BIAS ACS/WFC ACCUM WFC1-2K DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-2K DEF none none 6 none 1 N/A 13474( 8) - 12-Sep-2013 15:05:14 - [ 15] Summary Form for Proposal 13474 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC, WFC1-2K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters COMPRESSION=NONE, GAIN=2.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 10-MAR-2014:00:00:00 AND 14-APR-2014:00:00:00, BETWEEN 18-DEC-2013:00:00:00 AND 13-JAN-2014:00:00:00, BETWEEN 26-OCT-2013:00:00:00 AND 05-DEC-2013:00:00:00, GROUP A4, 03 WITHIN 14D, PATTERN 2 1-3, PATTERN 2 4-6, SCHED 30%, SCHED 40%, SEQ A1, A2, A3, A4 WITHIN 1 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F606W, F775W, POL0V, POL120V, POL60V ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, ISON ------------------------------------------------------------------------------------------------------------------------------------