After examining the background star field, we have determined that the observations must be conducted during one of the available orbits on 2015-Jul-04. We prefer observing on the first available orbit, which is the one starting near 11:16 UT on Jul 04. But any of the 6 following orbits should be fine too. To avoid scattered light artifacts, we require that the U3 position angle lie in the range 127-137 deg. We have made two other changes for visit 3 (SU03): (1) We have increased the step size in the 5-pt dither from 0.75 arcsec to 1.5 arcsec. This will mitigate the effects of any remaining scattered light artifacts. (2) We have offset the target by 5 arcsec in +Y from the default aperture location to move a bright star away from the UVIS2-UVIS1 boundary. -461591263 ----- Attempting Submission 1 (Fri Mar 13 19:41:46 GMT 2015) ----- ----- Attempting Submission 2 (Wed Apr 01 02:05:28 GMT 2015) ----- ----- Attempting Submission 3 (Tue May 26 11:11:46 GMT 2015) ----- ----- Attempting Submission 4 (Fri Jun 05 16:58:28 GMT 2015) ----- No need for me to run the Visit Planner because we know the target can be scheduled at the requested time. 0 Assigned ID: 2572 ----- Attempting Submission 1 (Wed Feb 11 02:45:09 GMT 2015) ----- Astrometric Follow-Up of Kuiper Belt Objects for the New Horizons Mission We propose five orbits of HST time for time-critical 2015 astrometry of the two Kuiper Belt Objects (KBOs) targetable by the New Horizons (NH) spacecraft during an extended mission to be proposed to NASA. These KBOs were discovered in our 2014 HST search campaign (GO 13633). A close flyby by NH of a typical KBO beyond Pluto will revolutionize our understanding of this major component of the solar system, and was recommended as a key part of the Pluto mission by the 2002 Planetary Decadal Survey. In August 2015, the New Horizons project and NASA must choose one of these objects as the flyby target for a potential extended mission, and make a course correction in late 2015 towards the chosen target. The 2015 astrometry proposed here supports that decision point by substantially improving our knowledge of the orbits of the two flyby candidates, providing essential information for the choice between the two. It will also enables an accurate burn towards the chosen target, and will greatly improve our knowledge of the KBO's location at the time of the encounter. Because we need several well-spaced observations well in advance of the August decision date, these observations must be made during HST Cycle 22; they cannot wait until HST Cycle 23 decisions are made. The faintness of these objects (R > 26.5) has to date made them impossible to detect from the ground, and certainly precludes 2015 astrometry of the necessary precision from ground-based telescopes. This program will make a total of three single-orbit visits, 2 visits to one of our two targets, and 1 visit to the other. This phase 2 describes the first two of these visits, one to each of our targets, to be made in May 2015. The final visit, to be made in summer 2015, will be submitted separately- the target chosen for that visit may depend on the results of the first two visits requested here. SOLAR SYSTEM 0 Regular false false false false false SUPPORTED SOLAR SYSTEM Using JPL #01 orbital elements. ASTEROID PT1-111113Y TYPE=ASTEROID,A=44.13910727552167,E=0.0449706694222827,I=2.450303934722035,O=159.0420382227352,W=192.1577572255627,M=294.2232035908972,EQUINOX=J2000,EPOCH=01-SEP-2014:00:00:00,EpochTimeScale=TDB EARTH SOLAR SYSTEM Using JPL #01 orbital elements. ASTEROID PT3-G12000JZ TYPE=ASTEROID,A=44.04268912944715,E=0.05170378391162126,I=4.121313140884151,O=136.2592604227296,W=239.4547871029322,M=270.7518427973431,EQUINOX=J2000,EPOCH=14-SEP-2014:00:00,EpochTimeScale=TDB EARTH WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP CELESTIAL OTHER 0.75 LINE false true 5 0 LINE 1 false CELESTIAL OTHER 1.5 LINE false false 5 0 LINE 2 false Using ephemeris for target 14053-01-2014MU69 ephemeris data for target 14053-01-2014MU69 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 15.090 to 17.091 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. 1430756154000 263.40704262446377 (Tic-Visit :proposal-id 14053 :visit-id "01" :proposal-version -1 :trans-version "20150128" :date "30-Mar-2015 13:28:55.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14053 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14053 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) true 1 0 Using ephemeris for target 14053-02-2014PN70 ephemeris data for target 14053-02-2014PN70 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 15.090 to 17.091 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. 1430761877000 263.2793907430926 (Tic-Visit :proposal-id 14053 :visit-id "02" :proposal-version -1 :trans-version "20150128" :date "30-Mar-2015 13:29:06.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14053 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14053 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) true 1 0 Using ephemeris for target 14053-03-2014MU69 ephemeris data for target 14053-03-2014MU69 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 15.094 to 16.153. ephemeris interval: 15.151 to 17.152 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14053 :visit-id "03" :proposal-version -1 :trans-version "20150417" :date "05-Jun-2015 12:44:52.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14053 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14053 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2999 :pcs-gap 0 ) false 1 0