Coordinated Observations of LCROSS Impacts

Coordinated Observations of LCROSS Impacts We propose to observe the LCROSS (Lunar Crater Observation and Sensing Satellite) impacts. This program will use STIS and WFC3 to observe the Moon in conjunction with NASA's LCROSS mission (assuming Servicing Mission 4 occurs before the LCROSS impacts). The goal is to determine whether or not water ice and/or vapor is present in the subsurface of the Moon. We will address this issue by 1) observing the sunlit ejecta plume created by the LCROSS impacts and 2) examine the Lunar exosphere for the presence of OH and other volatile species.

Orbit #1 (before the impact): STIS CCD G230LB spectroscopy, ~2100-3060?. This is a pre-impact calibration. Orbit #2 (at the time of impact): WFC3 F300X imaging. As many images as possible will be obtained to constrain the evolution of the impact plume with high spatial and temporal resolution. These observations will be timed such that this orbit occurs simultaneously with the LCROSS impacts. The goal of this spectral range is to observe the rapid 3085 ? OH- emission from the water vapor in the hot plasma occurring just after the impact flash. The time lag between the impact flash from the large projectile and the impact flash from the shepherding spacecraft is planned to be about 4 minutes. Observation of the first impact position a few minutes prior to impact is desired. Observing the evolution of the second impact flash and the ejecta curtain for at least several hundred seconds is also desirable. Therefore, an observational duration of at least 20 minutes will best cover the impacts. In the tradeoff, we are willing to sacrifice some pointing accuracy for increased spatial coverage. Orbits #3-5 (immediately following orbit 2): STIS CCD G230LB spectroscopy, ~2100-3060 ?. The short wavelength part of the 3085 ? OH- band should be observable (for example, this line is quite wide in IUE spectra). The OH- exosphere should last for several hours after impact so 3 HST orbits after the WFC3 observations would be ideal. We would like to observe at as long a wavelength as this grating allows. The OH band at 3085 ? is at about as short a wavelength as can be observed from the ground, and as long a wavelength as we propose to observe here, allowing normalization of the HST results with ground-based results. Monitoring the strength of this band is central to measuring the amount of water evolved in the impact, as water dissociates to OH and H very rapidly when exposed to sunlight. The CO Cameron bands (1900-2800 ?) derive primarily from the photodissociation of CO2. We propose to monitor these bands simultaneously with OH and CS (2600 ?) to constrain the composition of the volatile fraction of the impact plume. Orbit #6 (a day later): A repeat of the spectroscopic observations a day after the impact will constrain long lived radicals and allow a determination of the background emission. 0 false 0.0 0.0 false false false false false false AVAILABLE SOLAR SYSTEM OFFSET This target is used for guide star acquisition prior to slewing to the Moon. The coordinates should be leading the Moon's limb by about 10 degrees and must be defined for a specific observing time. J2000 00 00 0.0000 +00 00 0.00 J2000 SOLAR SYSTEM FEATURE Offset from the Moon just off of the sunlit limb STD=EARTH STD=MOON TYPE=POS_ANGLE,RAD=1000,ANG=85,REF=SUN HUBBLE SOLAR SYSTEM FEATURE Offset from the Moon just off of the sunlit limb STD=EARTH STD=MOON TYPE=POS_ANGLE,RAD=1000,ANG=85,REF=SUN HUBBLE SOLAR SYSTEM The target is offset from the limb by 270 km, which is 135 arcsec at the maximum lunar distance. This will keep the limb of the Moon out of the WFC3 fov even at apogee. FEATURE Offset from Cabeus-A crater near the south pole of the Moon. STD=EARTH STD=MOON TYPE=PCENTRIC,LONG=316.90,LAT=-81.55,RAD=2008.0,R_LONG=0.0,R_LAT=0.0,R_RAD=0.0,EPOCH=01-JAN-2008:01:00:00 A_VEL CABEUS-A-OFFSET FROM HUBBLE MIN 0.3, A_VEL CABEUS-A-OFFSET FROM HUBBLE MAX 0.3 HUBBLE SOLAR SYSTEM The target is offset from the limb by 270 km, which is 135 arcsec at the maximum lunar distance. This will keep the limb of the Moon out of the WFC3 fov even at apogee. FEATURE Offset from Cabeus-A crater near the south pole of the Moon. STD=EARTH STD=MOON TYPE=PCENTRIC,LONG=316.90,LAT=-81.55,RAD=2008.0,R_LONG=0.0,R_LAT=0.0,R_RAD=0.0,EPOCH=01-JAN-2008:01:00:00 A_VEL CABEUS-A-OFFSET-2 FROM HUBBLE MIN 0.3, A_VEL CABEUS-A-OFFSET-2 FROM HUBBLE MAX 0.3 HUBBLE SOLAR SYSTEM FEATURE Offset from the Moon just off of the sunlit limb STD=EARTH STD=MOON TYPE=POS_ANGLE,RAD=1025,ANG=85,REF=SUN HUBBLE SOLAR SYSTEM The target is offset from the limb by 270 km, which is 135 arcsec at the maximum lunar distance. This will keep the limb of the Moon out of the WFC3 fov even at apogee. FEATURE Offset from Cabeus crater near the south pole of the Moon. STD=EARTH STD=MOON TYPE=PCENTRIC,LONG=310.95,LAT=-84.7,RAD=2008.0,R_LONG=0.0,R_LAT=0.0,R_RAD=0.0,EPOCH=01-JAN-2008:01:00:00 A_VEL CABEUS-OFFSET FROM HUBBLE MIN 0.3, A_VEL CABEUS-OFFSET FROM HUBBLE MAX 0.3 HUBBLE Using ephemeris for target 11806-01-FAUSTINI ephemeris data for target 11806-01-FAUSTINI does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.306 to 11.001. ephemeris interval: 09.212 to 11.213 Timing link suitability includes constraints ([02 After 01 by at most 1.0 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. Pre-impact calibration observation: should take place a day before the impact, to minimize the impact of the variability of the Lunar atmosphere. Over 10m of unused visibility time is left to enhance schedulability due to time-critical nature of these observations. Visit 01 should precede visit 02 by a day or less. 1255029785000 260.51854295250064 (Tic-Visit :proposal-id 11806 :visit-id "01" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 570800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "01" :obset-id "01" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "01" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3155 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. The purpose of this visit is to make sure that there is a 2-star FGS acquisition to ensure that a fresh gyro bias calculation is available before visit 03 begins. 1255081724000 270.1492376035727 (Tic-Visit :proposal-id 11806 :visit-id "02" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11806 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 1500 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) false 1 0 Impact observation. The three (CR-SPLIT) images should each be one MT track to minimize drift during the sequence. 1255087657000 265.3719347361912 (Tic-Visit :proposal-id 11806 :visit-id "03" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "03" :obset-id "03" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "03" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2461 :al-overhead-at-end 0 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Using ephemeris for target 11806-03-FAUSTINI ephemeris data for target 11806-03-FAUSTINI does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.306 to 11.001. ephemeris interval: 09.212 to 11.213 Timing link suitability includes constraints ([03 After 02 by 0.1 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1255093257000 265.88889490985963 (Tic-Visit :proposal-id 11806 :visit-id "04" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 1398800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "04" :obset-id "04" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3142 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 2 :pcs-time 0 :si-vis-utilization 3189 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 3 :pcs-time 0 :si-vis-utilization 3192 :al-overhead-at-end 0 :internal-dur-at-end 401 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 3 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Start of Orbit #3, the orbit after the LCROSS impact. Start of Orbit #4, two orbits after the LCROSS impact. Start of Orbit #5, three orbits after the LCROSS impact. Using ephemeris for target 11806-04-FAUSTINI ephemeris data for target 11806-04-FAUSTINI does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.306 to 11.001. ephemeris interval: 09.212 to 11.213 Timing link suitability includes constraints ([04 After 02 by 0.9 to 1.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1255173932000 272.45608996857675 (Tic-Visit :proposal-id 11806 :visit-id "05" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 589216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "05" :obset-id "05" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "05" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Visits 11-15 are an alternative set to try a different ground system software processing path. Pre-impact calibration observation: should take place a day before the impact, to minimize the impact of the variability of the Lunar atmosphere. Over 10m of unused visibility time is left to enhance schedulability due to time-critical nature of these observations. Visit 11 should precede visit 12 by a day or less. (Tic-Visit :proposal-id 11806 :visit-id "01" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 570800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "01" :obset-id "01" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "01" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3155 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. The purpose of this visit is to make sure that there is a 2-star FGS acquisition to ensure that a fresh gyro bias calculation is available before visit 13 begins. (Tic-Visit :proposal-id 11806 :visit-id "02" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11806 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 1500 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) false 1 0 Impact observation. The three (CR-SPLIT) images should each be one MT track to minimize drift during the sequence. (Tic-Visit :proposal-id 11806 :visit-id "03" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "03" :obset-id "03" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "03" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2461 :al-overhead-at-end 0 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "04" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 1398800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "04" :obset-id "04" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3142 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 2 :pcs-time 0 :si-vis-utilization 3189 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 3 :pcs-time 0 :si-vis-utilization 3192 :al-overhead-at-end 0 :internal-dur-at-end 401 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 3 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Start of Orbit #3, the orbit after the LCROSS impact. Start of Orbit #4, two orbits after the LCROSS impact. Start of Orbit #5, three orbits after the LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "05" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 589216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "05" :obset-id "05" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "05" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Visits 21-25 are another set that uses smaller tracks in the STIS visits. Pre-impact calibration observation: should take place a day before the impact, to minimize the impact of the variability of the Lunar atmosphere. Over 10m of unused visibility time is left to enhance schedulability due to time-critical nature of these observations. Visit 01 should precede visit 02 by a day or less. (Tic-Visit :proposal-id 11806 :visit-id "21" :proposal-version -1 :trans-version "20090702" :date "01-Oct-2009 22:57:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 460304 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "21" :obset-id "21" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "21" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2551 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. The purpose of this visit is to make sure that there is a 2-star FGS acquisition to ensure that a fresh gyro bias calculation is available before visit 03 begins. (Tic-Visit :proposal-id 11806 :visit-id "02" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11806 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 1500 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) false 1 0 Impact observation. The three (CR-SPLIT) images should each be one MT track to minimize drift during the sequence. (Tic-Visit :proposal-id 11806 :visit-id "03" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "03" :obset-id "03" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "03" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2461 :al-overhead-at-end 0 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "24" :proposal-version -1 :trans-version "20090702" :date "01-Oct-2009 23:05:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 1398976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "24" :obset-id "24" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "24" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2626 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "24" :orbit-number 2 :pcs-time 0 :si-vis-utilization 2703 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "24" :orbit-number 3 :pcs-time 0 :si-vis-utilization 2634 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 3 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Start of Orbit #3, the orbit after the LCROSS impact. Start of Orbit #4, two orbits after the LCROSS impact. Start of Orbit #5, three orbits after the LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "25" :proposal-version -1 :trans-version "20090702" :date "01-Oct-2009 22:58:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 460304 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "25" :obset-id "25" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "25" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2509 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Visits 31-35 move the STIS target farther from the Moon. Pre-impact calibration observation: should take place a day before the impact, to minimize the impact of the variability of the Lunar atmosphere. Over 10m of unused visibility time is left to enhance schedulability due to time-critical nature of these observations. Visit 31 should precede visit 32 by a day or less. (Tic-Visit :proposal-id 11806 :visit-id "01" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 570800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "01" :obset-id "01" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "01" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3155 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. The purpose of this visit is to make sure that there is a 2-star FGS acquisition to ensure that a fresh gyro bias calculation is available before visit 03 begins. (Tic-Visit :proposal-id 11806 :visit-id "02" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11806 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 1500 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) false 1 0 Impact observation. The three (CR-SPLIT) images should each be one MT track to minimize drift during the sequence. (Tic-Visit :proposal-id 11806 :visit-id "03" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:31:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "03" :obset-id "03" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "03" :orbit-number 1 :pcs-time 3 :si-vis-utilization 2461 :al-overhead-at-end 0 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "04" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 1398800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "04" :obset-id "04" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3142 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 2 :pcs-time 0 :si-vis-utilization 3189 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11806 :visit-id "04" :orbit-number 3 :pcs-time 0 :si-vis-utilization 3192 :al-overhead-at-end 0 :internal-dur-at-end 401 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 3 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact. Start of Orbit #3, the orbit after the LCROSS impact. Start of Orbit #4, two orbits after the LCROSS impact. Start of Orbit #5, three orbits after the LCROSS impact. (Tic-Visit :proposal-id 11806 :visit-id "05" :proposal-version -1 :trans-version "20090702" :date "04-Sep-2009 14:32:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 589216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11806 :visit-id "05" :obset-id "05" :pcs-mode "GYRO" ) (Tic-Orbit :proposal-id 11806 :visit-id "05" :orbit-number 1 :pcs-time 3 :si-vis-utilization 3109 :al-overhead-at-end 0 :internal-dur-at-end 441 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Choose visits 01-04, 11-14, 21-24, 31-34, 41-44, 51-54, or 61-64 depending on which of the candidate targets is selected for LCROSS impact.