Many transneptunian objects (TNOs) have been found to be binary or multiple systems. As in other astrophysical settings, trans?neptunian binaries (TNBs) offer uniquely valuable information. Their mutual orbits allow the direct determination of their system masses, perhaps the most fundamental physical quantity of any astronomical object. Their frequency of occurrence and dynamical characteristics provide clues to formation conditions and evolution scenarios affecting both the binaries and their single neighbors. Combining masses with sizes, bulk densities can be measured. Densities constrain bulk composition and internal structure, key clues to TNO origins and evolution over time. Several TNB bulk densities have been determined, hinting at interesting trends. But none of them belongs to the Cold Classical sub-population, the one group of TNOs with demonstrably distinct physical characteristics. Two top-priority Spitzer programs will soon observe and measure the sizes of 3 Cold Classical TNBs. This proposal seeks to determine the mutual orbits and thus masses of these systems, enabling computation of their densities.

Strategically timed HST observations of binary Classical KBOs which are also being observed by Spitzer. The job of HST is to obtain relative astrometry, from which we determine the mutual orbits of the binary bodies, giving us their masses. Meanwhile, Spitzer deterines their surface areas. When we put these pieces of information together, we get the bulk densities. Since we don't know the orbital periods a priori, we start with an initial set of observations, then use Monte Carlo routines to work out optimal times for follow up observations. The visits to be scheduled this way start off being on hold until we give the go-ahead, in consultation with Tony Roman to ensure that they have a low impact on the scheduling team. Three TOO visits will be scheduled the same way, but leaving the target unspecified for now. 12 false 0.0 0.0 false false false false false false SUPPORTED SOLAR SYSTEM ASTEROID Classical_KBO TYPE=ASTEROID,A=44.652583007000,E=0.067365847149,I=2.41257373520,O=104.628203180000,W=326.068767050000,M=269.523907390000,EQUINOX=J2000,EPOCH=18-JUN-2009:00:00:00 EARTH SOLAR SYSTEM Previous warning about ephemeris uncertainty was removed 2008-10-10 because the updated ephemeris is now secure. ASTEROID Classical_KBO TYPE=ASTEROID,A=46.931737455,E=0.188478319810,I=3.4887927398,O=273.10713387,W=14.295672558,M=23.533022699,EQUINOX=J2000,EPOCH=18-JUN-2009:00:00:00 EARTH SOLAR SYSTEM ASTEROID Classical_KBO TYPE=ASTEROID,A=43.6895358320,E=0.00843554596,I=2.2530293654,O=304.376345610,W=247.0822536400,M=299.0138305900,EQUINOX=J2000,EPOCH=18-JUN-2009:00:00:00 EARTH POS-TARG DITHER 0.145 This is essentially the WFC3-UVIS-DITHER-LINE stock pattern, but I've tweaked it slightly, in an effort to improve sampling of the PSF in the UVIS1-C512B-SUB subarray near amplifier A where the pixel scale is slightly smaller than the UVIS average. The intention is to use this pattern in combination with POS-TARGs to maximize sub-pixel sampling of the PSF. LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 2 false Using ephemeris for target 11650-01-2003-QA91 ephemeris data for target 11650-01-2003-QA91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([02 After 01 by 0.3 to 0.5 days] [03 After 01 by 1.3 to 1.6 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1253028603000 80.53011742876339 (Tic-Visit :proposal-id 11650 :visit-id "01" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:13.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-02-2003-QA91 ephemeris data for target 11650-02-2003-QA91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([02 After 01 by 0.3 to 0.5 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1253060744000 80.53144737476651 (Tic-Visit :proposal-id 11650 :visit-id "02" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:15.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-03-2003-QA91 ephemeris data for target 11650-03-2003-QA91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([03 After 01 by 1.3 to 1.6 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1253154312000 52.4338354189955 (Tic-Visit :proposal-id 11650 :visit-id "03" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:19.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-04-2003-QA91 ephemeris data for target 11650-04-2003-QA91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1271289381000 247.02396581702556 (Tic-Visit :proposal-id 11650 :visit-id "04" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:21.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer input Using ephemeris for target 11650-05-2003-QA91 ephemeris data for target 11650-05-2003-QA91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1271640280000 247.20667559097637 (Tic-Visit :proposal-id 11650 :visit-id "05" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:23.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer input Using ephemeris for target 11650-06-2003-QR91 ephemeris data for target 11650-06-2003-QR91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([07 After 06 by 0.4 to 0.6 days] [08 After 06 by 2.1 to 2.5 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1252065223000 79.04687621854657 (Tic-Visit :proposal-id 11650 :visit-id "06" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:25.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-07-2003-QR91 ephemeris data for target 11650-07-2003-QR91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([07 After 06 by 0.4 to 0.6 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1252113899000 79.04901515652091 (Tic-Visit :proposal-id 11650 :visit-id "07" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:27.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-08-2003-QR91 ephemeris data for target 11650-08-2003-QR91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 Timing link suitability includes constraints ([08 After 06 by 2.1 to 2.5 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1252249280000 79.0549119015019 (Tic-Visit :proposal-id 11650 :visit-id "08" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:28.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Using ephemeris for target 11650-09-2003-QR91 ephemeris data for target 11650-09-2003-QR91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1273072857000 251.179715097981 (Tic-Visit :proposal-id 11650 :visit-id "09" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:30.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer input Using ephemeris for target 11650-10-2003-QR91 ephemeris data for target 11650-10-2003-QR91 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 09.151 to 11.152 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1273625649000 250.8799261157759 (Tic-Visit :proposal-id 11650 :visit-id "10" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:33.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer input Using ephemeris for target 11650-11-79360 ephemeris data for target 11650-11-79360 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 09.216 to 11.032. ephemeris interval: 10.031 to 12.032 Timing link suitability includes constraints ([12 After 11 by 1.0 to 1.2 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1267288587000 105.0639749542454 (Tic-Visit :proposal-id 11650 :visit-id "11" :proposal-version -1 :trans-version "20091209" :date "01-Feb-2010 12:56:40.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3234 :pcs-gap 0 ) false 1 0 Pending observer input (main observability window is in 2010) Using ephemeris for target 11650-12-79360 ephemeris data for target 11650-12-79360 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 09.216 to 11.032. ephemeris interval: 10.031 to 12.032 Timing link suitability includes constraints ([12 After 11 by 1.0 to 1.2 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1267371729000 105.0761364282987 (Tic-Visit :proposal-id 11650 :visit-id "12" :proposal-version -1 :trans-version "20091209" :date "01-Feb-2010 12:49:37.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3234 :pcs-gap 0 ) false 1 0 Pending observer input (main observability window is in 2010) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1270308534000 126.51180587202032 (Tic-Visit :proposal-id 11650 :visit-id "13" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:38.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "13" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2568 :al-overhead-at-end 40 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer activation The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1272300851000 105.34096385943042 (Tic-Visit :proposal-id 11650 :visit-id "14" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:40.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "14" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2568 :al-overhead-at-end 40 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer activation The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 11650 :visit-id "15" :proposal-version -1 :trans-version "20080807" :date "17-Jun-2009 10:45:41.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11650 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11650 :visit-id "15" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2568 :al-overhead-at-end 40 :internal-dur-at-end 79 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0 Pending observer activation