0 Assigned ID: 328 ----- Attempting Submission 1 (Thu Apr 06 22:50:59 GMT 2017) ----- HST Phase I Proposal 328 (229762.apt) successfully submitted. Receipt: # 328-1 ----- Attempting Submission 2 (Fri Apr 07 22:38:57 GMT 2017) ----- HST Phase I Proposal 328 (229762.apt) successfully submitted. Receipt: # 328-2 ----- Attempting Submission 3 (Fri Apr 07 23:44:39 GMT 2017) ----- FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser ORBITAL VISIBILITY OVERRUN FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser 0 ----- Attempting Submission 1 (Fri Jul 14 17:54:00 GMT 2017) ----- HST Phase II Proposal 15233 (15233.apt) successfully submitted. Receipt: # 15233-1 ----- Attempting Submission 2 (Tue Jul 18 19:14:10 GMT 2017) ----- ----- Attempting Submission 3 (Sat Jun 02 17:21:43 GMT 2018) ----- <type explanaAs described in separate e-mail.tion here>I used the ETC to experiment with backgrounds for my exposure times, filters, and target location at various times in the apparition. You're right, it isn't very time-variable. For my exposure times, I get background levels around 5.6, 1.1, and 3.2 for F606W, F438W, and F814W, respectively. So I set flashes of 8, 12, and 10 (aiming for 13 electrons, under the assumption that I should go a smidge over the 12 that was recommended). That made APT happy about the F438W exposures, but it's still grumpy about F606W and F814W. It says the backgrounds are 15.6 and 17.3 electrons, respectively. Must be something a little different in the assumptions between what APT uses and why I put into the ETC, but at least we're in the same ballpark. If my assumptions were better, it'll be around 13 and if APT's assumptions are better, it'll be a little higher, but only by a few electrons, so I'm going to hit submit (though if you think I should dial that F814W flash back a little to make APT's estimate a little lower, I'd be fine with that). Density of transneptunian object 229762 2007 UK126 Densities provide unique information about bulk composition and interior structure and are key to going beyond the skin-deep view offered by remote-sensing techniques based on photometry, spectroscopy, and polarimetry. They are known for a handful of the relict planetesimals that populate our Solar System's Kuiper belt, revealing intriguing differences between small and large bodies. More and better quality data are needed to address fundamental questions about how planetesimals form from nebular solids, and how distinct materials are distributed through the nebula. Masses from binary orbits are generally quite precise, but a problem afflicting many of the known densities is that they depend on size estimates from thermal emission observations, with large model-dependent uncertainties that dominate the error bars on density estimates. Stellar occultations can provide much more accurate sizes and thus densities, but they depend on fortuitous geometry and thus can only be done for a few particularly valuable binaries. We propose observations of a system where an accurate density can be determined: 229762 2007 UK126. An accurate size is already available from multiple stellar occultation chords. This proposal will determine the mass, and thus the density. Observations for mutual orbit determination of a transneptunian binary. Our goal is to determine the mutual orbit and thus the mass. Since we don't know the orbit orientation or period, it is efficient to use a step-wise strategy. We will do an initial pair of observation visits, to be scheduled as early as convient. After those are done, we will use the information obtained in those two visits to optimize scheduling of the subsequent visit, and so on. The last 3 visits are accordingly marked as "on hold". This is the same approach as we have used in several previous programs, and we believe we can do it in such a way as to not impose difficulties on the schedulers, via close coordination with STScI staff. Solar System 6 false false false false false false false SUPPORTED SOLAR SYSTEM ASTEROID transneptunian binary system TYPE=ASTEROID,A=72.804064901,E=0.485230329260,I=23.368191827000,O=131.139657960000,W=346.936504680000,M=343.739036250000,EQUINOX=J2000,EPOCH=01-JUL-2018:00:00:00,EpochTimeScale=UTC ANGULAR_RATE 229762 FROM EARTH GT 0.0001 EARTH WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.145 LINE false false 2 46.84 LINE 1 false Using ephemeris for target 15233-01-229762 ephemeris data for target 15233-01-229762 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.336 to 19.152. ephemeris interval: 18.151 to 20.153 Timing link suitability includes constraints ([02 After 01 by 0.4 to 0.8 days]) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. /tmp/OPVisit3613427720548121886.xml 1514902516000 67.4332591587264 (Tic-Visit :proposal-id 15233 :visit-id "01" :proposal-version -1 :trans-version "20180409" :date "02-Jun-2018 09:53:55.0" :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 15233 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15233 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 77 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 Using ephemeris for target 15233-02-229762 ephemeris data for target 15233-02-229762 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.336 to 19.152. ephemeris interval: 18.151 to 20.153 Timing link suitability includes constraints ([02 After 01 by 0.4 to 0.8 days]) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. /tmp/OPVisit7677416247413045060.xml 1514973864000 33.69999999999999 (Tic-Visit :proposal-id 15233 :visit-id "02" :proposal-version -1 :trans-version "20180409" :date "02-Jun-2018 09:53:57.0" :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 36624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15233 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15233 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 77 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 Using ephemeris for target 15233-03-229762 ephemeris data for target 15233-03-229762 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.336 to 19.152. ephemeris interval: 18.151 to 20.153 Timing link suitability includes constraints ([04 After 03 by 3.0 to 4.0 days]) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. /tmp/OPVisit4858689478730852123.xml 1522134300000 92.02605295449462 (Tic-Visit :proposal-id 15233 :visit-id "03" :proposal-version -1 :trans-version "20180409" :date "02-Jun-2018 09:53:58.0" :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 15233 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15233 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 77 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 Using ephemeris for target 15233-04-229762 ephemeris data for target 15233-04-229762 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.336 to 19.152. ephemeris interval: 18.151 to 20.153 Timing link suitability includes constraints ([04 After 03 by 3.0 to 4.0 days]) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. /tmp/OPVisit1880705436862452315.xml 1522474420000 91.0 (Tic-Visit :proposal-id 15233 :visit-id "04" :proposal-version -1 :trans-version "20180409" :date "02-Jun-2018 09:54:00.0" :trans-errors '(:WARNINGS 1 :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 15233 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15233 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2872 :al-overhead-at-end 0 :internal-dur-at-end 77 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 1 Using ephemeris for target 15233-05-229762 ephemeris data for target 15233-05-229762 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.336 to 19.152. ephemeris interval: 18.151 to 20.153 The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. /tmp/OPVisit358135198840929627.xml (Tic-Visit :proposal-id 15233 :visit-id "05" :proposal-version -1 :trans-version "20180409" :date "02-Jun-2018 09:54:01.0" :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 15233 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15233 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 77 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0