for mid-cycle opportunity - Jan 31, 2016 1965259156 Assigned ID: 1263 ----- Attempting Submission 1 (Sun Jan 31 18:13:08 GMT 2016) ----- Solar system target visit 1 ON HOLD until updated with ground-based windows. expected at end of April 2016 updated on 2 May with phased windows 1515928644 ----- Attempting Submission 1 (Thu Apr 14 17:39:24 GMT 2016) ----- ----- Attempting Submission 2 (Mon Apr 18 22:03:13 GMT 2016) ----- ----- Attempting Submission 3 (Mon May 02 17:17:42 GMT 2016) ----- Trojan Binary Candidate: A Slow-Rotating Mission Target A mission to the unexplored Jupiter Trojans is explicitly called for in the Planetary Decadal and HST observations in early 2016 can influence mission plans for both Discovery and New Frontiers. We propose to observe a Trojan that will be targeted by the step-1 Discovery mission, Lucy. (11351) 1997 TS25 is a Trojan that is notable for having one of the longest known rotation periods of any small body, T=514 h. A possible cause for this long period would be the existence of a tidally locked binary similar to the already-known long-period binary Trojan, (617) Patroclus. If so, the components will be separated by ~0.18 arcsec at lightcurve maximum, resolvable by WFC3. We will coordinate with groundbased observations to schedule near a maximum and thus require only a single orbit to confidently test whether (11351) 1997 TS25 is binary. Binary Trojans offer scientific benefits beyond the impact to any specific mission. Orbit-derived mass and density can be used to constrain planetary migration models. Low density is characteristic of bodies found in the dynamically cold Kuiper Belt, a remnant of the solar system's protoplanetary disk. Only one undisputed density has been measured in the Trojans, that of the binary (617) Patroclus, which has a low density of 0.8 g/cm3, similar to the low densities found in the Kuiper Belt. Evidence for or against a possible common origin linking Trojans and KBOs is a key constraint for planetesimal formation and planetary migration models relevant to the solar system and to planetary systems in general. Single orbit visit to Trojan (11351) Leucus (temp id 1997 TS25). Standard WFC3 imaging. The timing is tied to ground-based lightcurve analysis being completed by co-I Buie. One full phase completed, waiting for second repeating phase to take visit off hold. Preliminary guess to phase included in initial phase 2 submission. Solar System 0 false false false false false false SUPPORTED SOLAR SYSTEM ASTEROID Trojan TYPE=ASTEROID,A=5.259886569144591,E=.06547811318672574,I=11.57174016291844,O=251.1003040760594,W=159.1547220321686,M=13.33041690556806,EQUINOX=J2000,EPOCH=08-DEC-2009:00:00:00,EpochTimeScale=TDB EARTH WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false Using ephemeris for target 14491-01-TROJAN11351 ephemeris data for target 14491-01-TROJAN11351 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 15.213 to 17.121. ephemeris interval: 16.121 to 18.121 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/dd/hc9vrpdd56nfvg02_3n1tf5m0000gq/T/OPVisit6664628714357396722.xml (Tic-Visit :proposal-id 14491 :visit-id "01" :proposal-version -1 :trans-version "20160129" :date "02-May-2016 13:14:44.0" :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 82384 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14491 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14491 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2767 :al-overhead-at-end 0 :internal-dur-at-end 127 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0