0 Assigned ID: 1798 ----- Attempting Submission 1 (Fri Mar 01 21:36:06 GMT 2013) ----- HST Phase I Proposal 1798 (dhines_ACS_ISON.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 22:06:48 GMT 2013) ----- HST Phase I Proposal 1798 (dhines_ACS_ISON.apt) successfully submitted. ----- Attempting Submission 3 (Fri Mar 01 22:11:07 GMT 2013) ----- HST Phase I Proposal 1798 (dhines_ACS_ISON.apt) successfully submitted. ----- Attempting Submission 4 (Fri Mar 01 23:13:26 GMT 2013) ----- Contact Scientist David Golimowski added 4 internal orbits to obtain WFC1-2K bias calibration frames. These orbits will be charge to the Cycle 21 ACS Subarray Bias Frames calibration program. Changed proposal type back to GO, with available modes for the bias cals. 277213131 ----- Attempting Submission 1 (Fri Jun 28 20:11:20 GMT 2013) ----- ----- Attempting Submission 2 (Fri Aug 09 17:22:53 GMT 2013) ----- ----- Attempting Submission 3 (Fri Sep 06 16:45:38 GMT 2013) ----- HST Phase II Proposal 13474 (GO13474_2013_09_05.apt) successfully submitted. ----- Attempting Submission 4 (Fri Sep 06 18:30:28 GMT 2013) ----- ----- Attempting Submission 5 (Wed Sep 11 14:44:24 GMT 2013) ----- ----- Attempting Submission 6 (Wed Sep 11 18:22:16 GMT 2013) ----- ----- Attempting Submission 7 (Thu Sep 12 14:59:03 GMT 2013) ----- Excedance of allocated orbits caused by insertion of 4 internal orbits for bias calibration purposes. These orbits are not charged to the GO program, so this warning is spurious. Imaging Polarimetry of the 2013 Comet ISON with ACS: A Study of the Heterogeneous Coma 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. 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 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. SOLAR SYSTEM 0 false false false false false AVAILABLE SOLAR SYSTEM Target Ephemeris is from JPL Small-Body Database Browser. The solution date is 2013-Aug-26, and is JPL#35 COMET Comet C/2012 S1 (ISON) 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 EARTH ACS/WFC Imaging No Yes F775W ACS/WFC Imaging No Yes F435W ACS/WFC Imaging No Yes F775W ACS/WFC Imaging No Yes F435W ACS/WFC Imaging No Yes F775W ACS/WFC Imaging No Yes F435W ACS/WFC Imaging No Yes F775W ACS/WFC Imaging No Yes F435W POS-TARG DITHER 1 LINE 1.2 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 2 false Using ephemeris for target 13474-01-ISON ephemeris data for target 13474-01-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.092. ephemeris interval: 13.243 to 15.244 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13474 :visit-id "01" :proposal-version -1 :trans-version "20130722" :date "11-Sep-2013 14:16:21.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1685856 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13474 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13474 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2792 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13474 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2860 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) false 3 0 Using ephemeris for target 13474-02-ISON ephemeris data for target 13474-02-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.092. ephemeris interval: 13.243 to 15.244 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13474 :visit-id "02" :proposal-version -1 :trans-version "20130722" :date "11-Sep-2013 14:16:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1685856 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13474 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13474 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2784 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13474 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2844 :al-overhead-at-end 0 :internal-dur-at-end 344 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 3 0 Using ephemeris for target 13474-03-ISON ephemeris data for target 13474-03-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.092. ephemeris interval: 13.243 to 15.244 Timing link suitability includes constraints ([Group (03 A4) Within 14.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. (Tic-Visit :proposal-id 13474 :visit-id "A1" :proposal-version -1 :trans-version "20130722" :date "12-Sep-2013 10:58:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 0.0 :data-volume 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "A1" :obset-id "A1" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 13474 :visit-id "A1" :orbit-number 1 :pcs-time 0 :si-vis-utilization 0 :al-overhead-at-end 0 :internal-dur-at-end 1783 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Sequence (A1 A2 A3 A4) within 1.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. (Tic-Visit :proposal-id 13474 :visit-id "A2" :proposal-version -1 :trans-version "20130722" :date "11-Sep-2013 14:17:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 0.0 :data-volume 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "A2" :obset-id "A2" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 13474 :visit-id "A2" :orbit-number 1 :pcs-time 0 :si-vis-utilization 0 :al-overhead-at-end 0 :internal-dur-at-end 1783 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Sequence (A1 A2 A3 A4) within 1.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. (Tic-Visit :proposal-id 13474 :visit-id "A3" :proposal-version -1 :trans-version "20130722" :date "11-Sep-2013 14:17:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 0.0 :data-volume 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "A3" :obset-id "A3" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 13474 :visit-id "A3" :orbit-number 1 :pcs-time 0 :si-vis-utilization 0 :al-overhead-at-end 0 :internal-dur-at-end 1783 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (03 A4) Within 14.0 days] [Sequence (A1 A2 A3 A4) within 1.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. This orbit is charged to the Cycle 21 ACS Subarray Bias Calibration Program. (Tic-Visit :proposal-id 13474 :visit-id "A4" :proposal-version -1 :trans-version "20130722" :date "11-Sep-2013 14:17:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 0.0 :data-volume 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13474 :visit-id "A4" :obset-id "A4" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 13474 :visit-id "A4" :orbit-number 1 :pcs-time 0 :si-vis-utilization 0 :al-overhead-at-end 0 :internal-dur-at-end 1783 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0