13863( 14) - 17-Sep-2014 19:19:47 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13863 Version: 14 Check-in Time: 17-Sep-2014 19:19:47 STScI Edit Number: 0 Title Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ 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. 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. Evgenij Zubko Kharkiv National University N CoI: Dr. Vadim Kaydash Kharkiv National University N CoI: Max Mutchler Space Telescope Science Institute N CoI: Dr. Padmavati A Yanamandra-Fisher Space Science Institute N CoI: Prof. A.C. Levasseur-Regourd Universite Paris N CoI: Dr. Jian-Yang Li Planetary Science Institute N CoI: Dr. Ludmilla Kolokolova University of Maryland N CoI: Dr. Edith Hadamcik LATMOS N CoI: Dr. Colin Snodgrass Max Planck Institute for Solar System N Research CoI: Dr. Matt Taylor European Space Agency - ESTEC N CoI: Dr. Claudia J. Alexander Jet Propulsion Laboratory N ------------------------------------------------------------------------------------ Abstract We propose ACS/WFC imaging polarimetry of Comet 67P/Churyumov-Gerasimenko (hereafter 67P), in support of the Rosetta mission, to place stringent constraints on dust particles in the coma. Our observations bracket the period when Rosetta operates closest to 67P, and will deploy the Philae lander. Fortunately, this occurs when the comet phase angle is well centered in the negative-polarization branch (12-15 degrees), enabling the different materials within the coma to be mapped using their polarization response, providing information on comet heterogeneity, and on the size, shape/structure, composition, or orientation of the particles. Our results will compare directly with in-situ measurements from Rosetta, placing strong constraints on material on small scales near and at the nucleus, and on larger scales within the coma. During the encounter, 67P will subtend only about 4-5", so ground-based observations would only provide one or two "polarimetric resolution elements" across the coma, at most. Laser AO systems can provide higher spatial resolution, but do not have visible wavelength polarimetry modes. In addition to our high spatial resolution requirement, this exciting period in the Rosetta mission coincides with the end of the visibility window from Earth, with 67P only visible for around 45 minutes between the end of astronomical twilight and reaching 2 airmasses in mid-November for ground-based telescopes. The necessary S/N could not be achieved by polarimeters on even the largest ground-based telescopes during this window. HST/ACS is the only asset capable of achieving our objectives during this 13863( 14) - 17-Sep-2014 19:19:47 - [ 2] once-in-a-lifetime opportunity. ------------------------------------------------------------------------------------ Observations Description ------------------------ We use POLV polarizers. This will enable us to construct a broadband polarization image of the coma with a high S/N ~ 300. For ACS, all wavelengths < 0.6 um are potentially contaminated by molecular line emission, and strong CN bands exist at 0.92 um. Molecular emission will be essentially unpolarized, which artificially reduces the measured degree of polarization. While narrowband filters are ideal, their use is prohibitively expensive to obtain sufficient S/N for the comet at its distance and size on in August 2014. We therefore choose the F606W filter. We acknowledge that our results may suffer contamination from the molecular species CN, C2, and C3 that will dilute the polarization signal. However, at 3.5AU from the Sun, the contamination should not be a problem (it was not an issue for Comet ISON at similar distances: Hines et al. 2014), and near-contemporaneous ground-based spectroscopic monitoring (e.g., as coordinated by Co-I, Snodgrass) will provide accurate equivalent-width measurements of the contaminating emission that will then be used to correct the polarimetry . In addition, while the F775W would be less contaminated, the calibration of the filter is less accurate, and the exposure times would need to be about 40% longer to achieve similar S/N in the polarimetry. The efficacy of ACS/WFC imaging polarimetry for extended sources has been demonstrated in general (e.g., Sparks et al. 2008), and in particular for comets with low, but significant polarization (Hines et al. 2014). The calibration observations of the F606W + visible polarizer combinations were obtained during the Cycle 12 ACS polarimetric calibration campaign (CAL 10055), and Hines has used these to recalibrate the system, showing that precise (p~0.3%) polarization measurements with an absolute accuracy of p%~0.3%, can be achieved with the system. We expect the measured polarization of 67P to range from ~2-6%. Since polarization follows a Rice, not a Gaussian, distribution, we require a P/sigp > 4 per resolution element. We therefore need p~0.3%. For three perfect polarizers oriented at 60 degrees relative position angles (as in the ACS), the uncertainty in the degree of polarization P (which ranges from 0 for unpolarized light to 1 for fully polarized light) is approximately the inverse of the signal-to-noise per image. Sparks & Axon (1999) find [see equation in their paper - DCH], where S/Ni is the signal-to-noise of the ith image. Therefore, in order to achieve P/sigp > 4 for P ~2%, we require S/Ni > 268. Using our successful observations of Comet ISON (Hines et al. 2014) as a validation of our S/N calculations, we estimate the total integration time needed to achieve S/N. Using the above V-band surface brightness, we estimate the exposure time for 2.0e-/DN gain, and a G2V spectrum. To achieve the required S/N, we may have to bin the data by up to 19x19 pixels (we will bin only until we reach the desired precision, S/N). This still yields sub-acrsecond spatial resolution, and cannot be done from the ground. The results of our exposure time estimates are shown in Table 3. The last column shows our expected allocation need including guide star acquisition (8 13863( 14) - 17-Sep-2014 19:19:47 - [ 3] minutes), and reacquisition (6 minutes), plus instrument overheads. We use CRSPLIT=2, and a two-position dither. We request a total of 21 orbits for this program. CALIBRATION ORBITS: As per STScI policy, 8 internal orbits have been added to this proposal for the purpose of obtaining subarray bias frames that are contemporaneous with the science observations. These internal orbits will be charged to STScI's Cycle 22 ACS Calibration Program, not to GO 13863. The ACS Instrument Team at STScI is responsible for producing superbias reference files from the bias frames obtained in this GO proposal. ------------------------------------------------------------------------------------ 13863( 14) - 17-Sep-2014 19:19:47 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: COMET-67P-CHURYUMOV-GERASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET COMET-67P-CHURYUMOV-GERASIMENKO which is the primary target for Rosetta Spacecraft ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=1.243119605049142, E=0.6410532328350245, I=7.040848762748019, O=50.15180617652601, W=12.773219225972, T=13-AUG-2015:00:01:52, TTimeScale=TDT, EQUINOX=J2000, EPOCH=03-MAY-2014:00:00:00, EpochTimeScale=TDT, A1=1.074213162065E-9, A2=1.064203027636E-10, A3=1.297521963716E-10 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 19.6 Ephemeris from HORIZONS JPL#K084/16 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 13863( 14) - 17-Sep-2014 19:19:47 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.265 Line_Spacing 3.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.149 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 34.25 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13863( 14) - 17-Sep-2014 19:19:47 - [ 6] Visit: 01 Visit Requirements: SCHED 30%; BETWEEN 18-AUG-2014:00:00:00 AND 20-AUG-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 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 2400 S PATTERN 1 1 HURYUMOV-GE POL0V (9600 S) RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 1 3 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 1 4 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 2 4 N/A -GERASIMENKO POL0V 13863( 14) - 17-Sep-2014 19:19:47 - [ 7] Visit: 02 Visit Requirements: SCHED 30%; AFTER 01 BY 23.6 H TO 24.2 H 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 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 2400 S PATTERN 1 1 HURYUMOV-GE POL60V (9600 S) RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 1 3 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 1 4 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 2 4 N/A -GERASIMENKO POL60V 13863( 14) - 17-Sep-2014 19:19:47 - [ 8] Visit: 03 Visit Requirements: SCHED 30%; AFTER 01 BY 48.8 H TO 49.4 H 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 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 2400 S GS ACQ SCENARIO BASE1B3; HURYUMOV-GE POL120V (9600 S) PATTERN 1 1 RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 1 3 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 1 4 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC F606W, 4 none none 2 4 N/A -GERASIMENKO POL120V 13863( 14) - 17-Sep-2014 19:19:47 - [ 9] Visit: 04 Visit Requirements: SCHED 30%; BETWEEN 16-NOV-2014:00:00:00 AND 18-NOV-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 COMET-67P-C ACS/WFC ACCUM WFC1-2K F775W 1 150 S (300 GS ACQ SCENARIO BASE1B3; HURYUMOV-GE S) PATTERN 2 1 RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 2 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 1570 S PATTERN 1 2 HURYUMOV-GE POL0V (6280 S) RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 1 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 2 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 1 2 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 1 3 N/A -GERASIMENKO POL0V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 2 3 N/A -GERASIMENKO POL0V 13863( 14) - 17-Sep-2014 19:19:47 - [ 10] Visit: 05 Visit Requirements: SCHED 30%; AFTER 04 BY 23.6 H TO 24.2 H 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 COMET-67P-C ACS/WFC ACCUM WFC1-2K F775W 1 150 S (300 GS ACQ SCENARIO BASE1B3; HURYUMOV-GE S) PATTERN 2 1 RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 2 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 1570 S PATTERN 1 2 HURYUMOV-GE POL60V (6280 S) RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 1 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 2 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 1 2 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 1 3 N/A -GERASIMENKO POL60V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 2 3 N/A -GERASIMENKO POL60V 13863( 14) - 17-Sep-2014 19:19:47 - [ 11] Visit: 06 Visit Requirements: SCHED 30%; AFTER 04 BY 48.8 H TO 49.4 H 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 COMET-67P-C ACS/WFC ACCUM WFC1-2K F775W 1 150 S (300 GS ACQ SCENARIO BASE1B3; HURYUMOV-GE S) PATTERN 2 1 RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 2 COMET-67P-C ACS/WFC ACCUM WFC F606W, CR-SPLIT=2 1 1570 S PATTERN 1 2 HURYUMOV-GE POL120V (6280 S) RASIMENKO ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 1 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 1 ACS/WFC ACCUM WFC1-2K F775W 2 none none none 1 N/A -GERASIMENKO COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 1 1 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 1 none none 2 1 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 1 2 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 2 none none 2 2 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 1 2 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 3 none none 2 3 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 1 3 N/A -GERASIMENKO POL120V COMET-67P-CHURYUMOV 2 ACS/WFC ACCUM WFC F606W, 4 none none 2 3 N/A -GERASIMENKO POL120V 13863( 14) - 17-Sep-2014 19:19:47 - [ 12] Visit: A1 Visit Requirements: SEQ A1, A2, A3, A4 WITHIN 1 D On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 13] Visit: A2 Visit Requirements: On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 14] Visit: A3 Visit Requirements: On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 15] Visit: A4 Visit Requirements: GROUP A4, 01 WITHIN 14D On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 16] Visit: B1 Visit Requirements: SEQ B1, B2, B3, B4 WITHIN 1 D On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 17] Visit: B2 Visit Requirements: On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 18] Visit: B3 Visit Requirements: On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 19] Visit: B4 Visit Requirements: GROUP B4, 04 WITHIN 14D On Hold Comments: Additional Comments: This orbit will be charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 13863( 14) - 17-Sep-2014 19:19:47 - [ 20] Summary Form for Proposal 13863 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC, WFC1-2K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters COMPRESSION=NONE, CR-SPLIT=2, GAIN=2.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 23.6 H TO 24.2 H, AFTER 01 BY 48.8 H TO 49.4 H, AFTER 04 BY 23.6 H TO 24.2 H, AFTER 04 BY 48.8 H TO 49.4 H, BETWEEN 16-NOV-2014:00:00:00 AND 18-NOV-2014:00:00:00, BETWEEN 18-AUG-2014:00:00:00 AND 20-AUG-2014:00:00:00, GROUP A4, 01 WITHIN 14D, GROUP B4, 04 WITHIN 14D, GS ACQ SCENARIO BASE1B3, PATTERN 1 1, PATTERN 1 2, PATTERN 2 1, SCHED 30%, SEQ A1, A2, A3, A4 WITHIN 1 D, SEQ B1, B2, B3, B4 WITHIN 1 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F606W, F775W, POL0V, POL120V, POL60V ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, COMET-67P-CHURYUMOV-GERASIMENKO ------------------------------------------------------------------------------------------------------------------------------------