Precise Orbit Determination for a New Horizons KBO

0 Assigned ID: 1671 ----- Attempting Submission 1 (Fri Mar 01 19:27:27 GMT 2013) ----- ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN Tony and Bill: Can you please coordinate on the scheduling of the visits so that visits 11 and 12 from this program (GO-13311) are scheduled 1-3 days after visits J3 and J4 of John Spencer’s program (GO-13633). Please let us know as soon as tentative scheduling slots are identified, so that we can check for spoiler stars. 2095368106 ----- Attempting Submission 1 (Wed Jun 26 18:22:03 GMT 2013) ----- ----- Attempting Submission 2 (Thu Aug 14 09:31:50 GMT 2014) ----- This sequence has been used without issue recently. Precise Orbit Determination for a New Horizons KBO 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. To date, we have 28 discoveries including five objects that are long-range reconnaissance candidates, two that are pre-Pluto encounter observation candidates and two that current orbit predictions require about a factor of 2 more propellant than available for the targeting maneuver. Our searches are continuing in to 2013. Unfortunately, NH's trajectory line of site is within the galactic center (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 objects. We request 2 TOO orbits to be triggered in the event that a candidate object is found within the targetable region. These observations will provide the required high precision astrometry, will evaluate if the NH candidate is binary (~30%) and will make a preliminary color determination to assist in fly-by planning. We obtain 5-370 second exposures using a linear dither pattern 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. We are now requesting ToO activation to observe newly discovered KBO A31006AP ASAP, consistent with a non-disruptive ToO. Once tentative scheduling slots are identified we will check the fields for spoler stars. SOLAR SYSTEM Default false false false false false SUPPORTED SOLAR SYSTEM ASTEROID NH-KBO TYPE=ASTEROID,A=42.973765058193,E=0.11396475141900,I=3.0501788148877,O=147.05090589013,W=15.982597374200,M=105.16977073587,EQUINOX=J2000,EPOCH=24-JUL-2014:00:00:00,EpochTimeScale=UTC EARTH WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F606W CELESTIAL OTHER 0.75 LINE false true 5 0 LINE 1

false

1407980807817 /Users/sbenecchi/Shared/Proposals/HST/Phase2/Benecchi_13311_Cycle21/OP-cache/Phase2_13311_revised-v11.xml Using ephemeris for target 13311-11-A31006AP ephemeris data for target 13311-11-A31006AP does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.213. ephemeris interval: 14.212 to 16.214 Timing link suitability includes constraints ([Sequence (11 12) within 1.0 days] [12 After 11 by 0.1 to 0.1 days]) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13311 :visit-id "11" :proposal-version -1 :trans-version "20140605" :date "13-Aug-2014 21:46:47.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13311 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13311 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :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 1 1407980888131 /Users/sbenecchi/Shared/Proposals/HST/Phase2/Benecchi_13311_Cycle21/OP-cache/Phase2_13311_revised-v12.xml Using ephemeris for target 13311-12-A31006AP ephemeris data for target 13311-12-A31006AP does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.213. ephemeris interval: 14.212 to 16.214 Timing link suitability includes constraints ([Sequence (11 12) within 1.0 days] [12 After 11 by 0.1 to 0.1 days]) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13311 :visit-id "12" :proposal-version -1 :trans-version "20140605" :date "13-Aug-2014 21:48:07.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13311 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13311 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :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 1