0 Assigned ID: 274 ----- Attempting Submission 1 (Fri Feb 24 02:15:17 GMT 2012) ----- Revised timing of visit comments based on exchange of information and advice of contact/ instrument scientist. -1972259550 ----- Attempting Submission 1 (Mon Jul 09 13:09:29 GMT 2012) ----- HST Phase II Proposal 12887 (Phase2_v1.apt) successfully submitted. ----- Attempting Submission 2 (Mon Aug 27 17:14:06 GMT 2012) ----- ----- Attempting Submission 3 (Tue Sep 25 19:57:04 GMT 2012) ----- ----- Attempting Submission 4 (Fri Aug 30 13:35:05 GMT 2013) ----- ----- Attempting Submission 5 (Fri Aug 30 21:28:10 GMT 2013) ----- Precise Orbit Determination for New Horizons Candidate KBOs The New Horizons (NH) spacecraft is on its way to study the Pluto system during a flyby after which the spacecraft will be retargeted to one or more Kuiper Belt Objects (KBOs) to learn about small KBOs and the Kuiper Belt population. We are actively carrying out dedicated ground-based observations to identify a target for NH to flyby and continue to improve our analysis algorithms. So far we have identified a few candidate objects, but none have proven to be within an accessible distance for NH, our searches will continue in 2012 and 2013. Unfortunately, NH's trajectory line of site is within the galactic plane (Sagittarius) making stellar confusion a major problem in obtaining precise astrometry and high precision orbits for these objects from the ground. HST's sensitivity, resolution and PSF stability are crucial components for determining precise orbits for these candidates. We have been awarded 2 TOO orbits to observe a KBO candidate to be triggered in the event that a candidate object is found within the targetable region. The observations we propose will also determine if the NH candidate is binary (~30% probability per candidate) and will make a preliminary color determination to assist in target selection. We obtain 2-455 second exposures using a manual dither pattern and 2-640 second exposures in the F814W filter to obtain a color measurement (0.1 magnitude uncertainty) on the NH KBO candidate. Both TOO orbits are planned to take the same set of exposures. This project imposes no orientation constraints and uses ordinary blind target acquisition. We tracking the object under FGS control, target motion rates are very slow, at most a few arcsec per hour. SOLAR SYSTEM 12 false false 0.0 0.0 false false false SUPPORTED SOLAR SYSTEM ASTEROID NH-KBO TYPE=ASTEROID,A=49.14322117,E=0.35008658,I=2.97806,O=157.99643,W=25.56316,M=55.18679,EQUINOX=J2000,EPOCH=28-MAY-2013:00:00:00,EpochTimeScale=UTC EARTH WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W Using ephemeris for target 12887-01-VNH0034 ephemeris data for target 12887-01-VNH0034 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.213. ephemeris interval: 13.212 to 15.213 Timing link suitability includes constraints ([02 After 01 by 0.7 to 1.1 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /Users/susank/Shared/Proposals/HST/Phase2/Benecchi_12887_Cycle20/OP-cache/12287_Revised_130830b-v01.xml (Tic-Visit :proposal-id 12887 :visit-id "01" :proposal-version -1 :trans-version "20130722" :date "30-Aug-2013 17:23:06.0" :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12887 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12887 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2894 :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 3229 :pcs-gap 0 ) true 1 0 Using ephemeris for target 12887-02-VNH0034 ephemeris data for target 12887-02-VNH0034 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.213. ephemeris interval: 13.212 to 15.213 Timing link suitability includes constraints ([02 After 01 by 0.7 to 1.1 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /Users/susank/Shared/Proposals/HST/Phase2/Benecchi_12887_Cycle20/OP-cache/12287_Revised_130830b-v02.xml (Tic-Visit :proposal-id 12887 :visit-id "02" :proposal-version -1 :trans-version "20130722" :date "30-Aug-2013 17:18:18.0" :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12887 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12887 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2894 :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 3229 :pcs-gap 0 ) true 1 0