Nine densely-packed inner moons of Uranus show signs of chaos and orbital instability over a variety of time scales. Many moons show measureable orbital changes within a decade or less. Long-term integrations predict that some moons could collide in less than one million years. One faint ring embedded in the system may, in fact, be the debris left behind from an earlier such collision. Meanwhile, the nearby moon Mab falls well outside the influence of the others but nevertheless shows rapid, as yet unexplained, changes in its orbit. It is embedded within a dust ring that also shows surprising variability. A highly optimized series of observations with WFC3 over the next three cycles will address some of the fundamental open questions about this dynamically active system: Do the orbits truly show evidence of chaos? If so, over what time scales? What can we say about the masses of the moons involved? What is the nature of the variations in Mab's orbit? Is Mab's motion predictable or random? Astrometry will enable us to derive the orbital elements of these moons with 10-km precision. This will be sufficient to study the year-by-year changes and, combined with other data from 2003-2007, the decadal evolution of the orbits. The pairing of precise astrometry with numerical integrations will enable us to derive new dynamical constraints on the masses of these moons. Mass is the fundamental unknown quantity currently limiting our ability to reproduce the interactions within this system. This program will also capitalize upon our best opportunity for nearly 40 years to study the unexplained variations in Uranus's faint outer rings. Astrometry of the Uranian satellites is accomplished via three visits in 2012 and three in 2013. Each visit consists of a sequence of long exposures through the broad F350LP filter. Visits begin with one unsaturated image of the planet for geometric reference and calibration checking. The orbital plane is oriented within 20 degrees of the X-axis in the images to separate the moons from the wide vertical band caused by saturation bloom from the planet. From orbit to orbit, Uranus is shifted upward and downward by ~ 40 pixels within the 512x512 subarray to achieve most of the benefits of dithering; however, moons can always be distinguished from hot pixels by their motion. Each visit is timed to place Cupid and Mab near their maximum orbital elonagations to ensure that these high-priority targets are both detectable. The other moons will be captured by chance and require no special targeting. Timing constraints are specified to ensure that we maximize the time baseline within both 2012 and 2013. We also ensure that Mab is captured at both north and south elongations each year to better constrain its orbital eccentricity. Visits 44-46 are designated ON HOLD and are provided as an alternative set to 41-43. Schedule either 41-43 or 44-46; they are scientifically equivalent. Similarly, Visits 54-56 are provided as a scheduling alternative to 51-53; schedule either set of three. Note also that Uranus falls within the restricted range of RA. Nevertheless, we have not selected SCHED=100 because our scheduling constraints are defined by other factors. With SCHED=30-50, we obtain ~ 3 minutes of extra integration time per visit without affecting schedulability. SOLAR SYSTEM 12 false false 0.0 0.0 false false false SUPPORTED SOLAR SYSTEM PLANET Uranus with Mab and Cupid positioned near elongation, Mab south of Uranus STD=URANUS OLG OF MAB BETWEEN 60 120, NOT OLG OF CUPID BETWEEN 0 60, NOT OLG OF CUPID BETWEEN 120 240, NOT OLG OF CUPID BETWEEN 300 360, SEP OF MAB OBERON FROM EARTH GT 5", SEP OF CUPID OBERON FROM EARTH GT 5", SEP OF MAB TITANIA FROM EARTH GT 5", SEP OF CUPID TITANIA FROM EARTH GT 5", SEP OF MAB UMBRIEL FROM EARTH GT 4", SEP OF CUPID UMBRIEL FROM EARTH GT 4", SEP OF MAB ARIEL FROM EARTH GT 4", SEP OF CUPID ARIEL FROM EARTH GT 4" EARTH SOLAR SYSTEM PLANET Uranus with Mab and Cupid positioned near elongation, Mab north of Uranus STD=URANUS OLG OF MAB BETWEEN 240 300, NOT OLG OF CUPID BETWEEN 0 60, NOT OLG OF CUPID BETWEEN 120 240, NOT OLG OF CUPID BETWEEN 300 360, SEP OF MAB OBERON FROM EARTH GT 5", SEP OF CUPID OBERON FROM EARTH GT 5", SEP OF MAB TITANIA FROM EARTH GT 5", SEP OF CUPID TITANIA FROM EARTH GT 5", SEP OF MAB UMBRIEL FROM EARTH GT 4", SEP OF CUPID UMBRIEL FROM EARTH GT 4", SEP OF MAB ARIEL FROM EARTH GT 4", SEP OF CUPID ARIEL FROM EARTH GT 4" EARTH SOLAR SYSTEM PLANET Uranus with Mab and Cupid positioned near elongation STD=URANUS NOT OLG OF MAB BETWEEN 0 60, NOT OLG OF CUPID BETWEEN 0 60, NOT OLG OF CUPID BETWEEN 120 240, NOT OLG OF CUPID BETWEEN 300 360, SEP OF MAB OBERON FROM EARTH GT 5", SEP OF CUPID OBERON FROM EARTH GT 5", SEP OF MAB TITANIA FROM EARTH GT 5", SEP OF CUPID TITANIA FROM EARTH GT 5", SEP OF MAB UMBRIEL FROM EARTH GT 4", SEP OF CUPID UMBRIEL FROM EARTH GT 4", SEP OF MAB ARIEL FROM EARTH GT 4", SEP OF CUPID ARIEL FROM EARTH GT 4", NOT OLG OF MAB FROM EARTH BETWEEN 120 240, NOT OLG OF MAB FROM EARTH BETWEEN 300 360 EARTH WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F390W WFC3/UVIS Imaging No No F467M WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F621M WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F845M WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W Using ephemeris for target 13055-41-URANUS-MAB-SOUTH-CUPID ephemeris data for target 13055-41-URANUS-MAB-SOUTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([42 After 41 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in October 2012. 1350641660000 41.75509597527241 (Tic-Visit :proposal-id 13055 :visit-id "41" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:21:49.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "41" :obset-id "41" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "41" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2885 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-42-URANUS-MAB-NORTH-CUPID ephemeris data for target 13055-42-URANUS-MAB-NORTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([42 After 41 by 14.0 to 60.0 days] [43 After 42 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in November 2012, at least two weeks after Visit 41. 1354110979000 46.0 (Tic-Visit :proposal-id 13055 :visit-id "42" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:21:51.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "42" :obset-id "42" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "42" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2867 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-43-URANUS-MAB-SOUTH-CUPID ephemeris data for target 13055-43-URANUS-MAB-SOUTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([43 After 42 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in December 2012, at least two weeks after Visit 42. (Tic-Visit :proposal-id 13055 :visit-id "43" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:57:43.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "43" :obset-id "43" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "43" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2860 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-44-URANUS-MAB-NORTH-CUPID ephemeris data for target 13055-44-URANUS-MAB-NORTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([45 After 44 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in October 2012. (Tic-Visit :proposal-id 13055 :visit-id "44" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:39:16.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "44" :obset-id "44" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "44" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2885 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Visits 44-46 are provided as an alternative to Visits 41-43 for extra scheduling flexibility. Schedule either the set 41-43 or the set 44-46; they are scientifically equivalent. Using ephemeris for target 13055-45-URANUS-MAB-SOUTH-CUPID ephemeris data for target 13055-45-URANUS-MAB-SOUTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([45 After 44 by 14.0 to 60.0 days] [46 After 45 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in November 2012, at least two weeks after Visit 51. (Tic-Visit :proposal-id 13055 :visit-id "45" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:39:21.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "45" :obset-id "45" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "45" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2867 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Visits 44-46 are provided as an alternative to Visits 41-43 for extra scheduling flexibility. Schedule either the set 41-43 or the set 44-46; they are scientifically equivalent. Using ephemeris for target 13055-46-URANUS-MAB-NORTH-CUPID ephemeris data for target 13055-46-URANUS-MAB-NORTH-CUPID does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.153 to 14.092. ephemeris interval: 12.182 to 14.182 Timing link suitability includes constraints ([46 After 45 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in December 2012, at least two weeks after Visit 42. (Tic-Visit :proposal-id 13055 :visit-id "46" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:39:24.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "46" :obset-id "46" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "46" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2860 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Visits 44-46 are provided as an alternative to Visits 41-43 for extra scheduling flexibility. Schedule either the set 41-43 or the set 44-46; they are scientifically equivalent. Using ephemeris for target 0-50-URANUS-MAB-CUPID ephemeris data for target 0-50-URANUS-MAB-CUPID 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: 13.031 to 15.032 The scheduling data was generated by CASM 21.0. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. This visit replaces visit 43 which was missed due to an HST safing. (Tic-Visit :proposal-id 0 :visit-id "50" :proposal-version -1 :trans-version "20121031" :date "24-Feb-2013 18:01:15.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 0 :visit-id "50" :obset-id "50" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 0 :visit-id "50" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-51-URANUS-MAB-NORTH-CUPID Timing link suitability includes constraints ([52 After 51 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in July 2013. (Tic-Visit :proposal-id 13055 :visit-id "51" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:27:24.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "51" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2828 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-52-URANUS-MAB-SOUTH-CUPID Timing link suitability includes constraints ([52 After 51 by 14.0 to 60.0 days] [53 After 52 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in August 2013, at least two weeks after Visit 51. (Tic-Visit :proposal-id 13055 :visit-id "52" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:28:29.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "52" :obset-id "52" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "52" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2835 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-53-URANUS-MAB-NORTH-CUPID Timing link suitability includes constraints ([53 After 52 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in September 2013, at least two weeks after Visit 52. (Tic-Visit :proposal-id 13055 :visit-id "53" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:28:14.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "53" :obset-id "53" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "53" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2853 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Using ephemeris for target 13055-54-URANUS-MAB-SOUTH-CUPID Timing link suitability includes constraints ([55 After 54 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in July 2013. (Tic-Visit :proposal-id 13055 :visit-id "54" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:53:41.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "54" :obset-id "54" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "54" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2828 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) false 1 0 Visits 54-56 are provided as an alternative to Visits 51-53 for extra scheduling flexibility. Schedule either the set 51-53 or the set 54-56; they are scientifically equivalent. Using ephemeris for target 13055-55-URANUS-MAB-NORTH-CUPID Timing link suitability includes constraints ([55 After 54 by 14.0 to 60.0 days] [56 After 55 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab north of Uranus. To be scheduled in August 2013, at least two weeks after Visit 54. (Tic-Visit :proposal-id 13055 :visit-id "55" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:36:46.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "55" :obset-id "55" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "55" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2835 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3179 :pcs-gap 0 ) false 1 0 Visits 54-56 are provided as an alternative to Visits 51-53 for extra scheduling flexibility. Schedule either the set 51-53 or the set 54-56; they are scientifically equivalent. Using ephemeris for target 13055-56-URANUS-MAB-SOUTH-CUPID Timing link suitability includes constraints ([56 After 55 by 14.0 to 60.0 days]) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Uranus with the ring plane oriented within 20 degrees of horizontal. Mab and Cupid near maximum elongation, with Mab south of Uranus. To be scheduled in September 2013, at least two weeks after Visit 55. (Tic-Visit :proposal-id 13055 :visit-id "56" :proposal-version -1 :trans-version "20120604" :date "04-Jul-2012 06:36:47.0" :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 41200 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13055 :visit-id "56" :obset-id "56" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13055 :visit-id "56" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2853 :al-overhead-at-end 0 :internal-dur-at-end 82 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) false 1 0 Visits 54-56 are provided as an alternative to Visits 51-53 for extra scheduling flexibility. Schedule either the set 51-53 or the set 54-56; they are scientifically equivalent.