Sensitive exposures should have an ETC run number provided. This version follows from a significnt ammount of coordination and cooperation among the 4 HST programs covering the Mars-CSS event. Here we added some ACS/SBC exposures to complement John Clarke's program, and set a BETWEEN for the orbit selected within the 22-orbit sequence over 4 different programs. -- Max Mutchler -1224966881 ----- Attempting Submission 2 (Fri Sep 19 20:05:23 GMT 2014) ----- Having some APT server trouble but I think this orbit is OK. _ Max On Oct 19 2014, circa 18:30 UT, dynamically new Oort Cloud comet C/2013 A1 (Siding Spring) will fly within 138,000 km of the planet Mars. This distance is so small (1/3 the mean Earth-Moon distance, and 10 times closer than any comet has approached the Earth in the modern spaceflight era) that Mars will be moving through the comet's outer atmosphere, or coma, carrying Mars, and its orbiting and ground based roving spacecraft fleet with it. In this way the Mars fleet will be participating in a close comet flyby. This program to image Mars will work in concert with several other HST programs imaging the comet during this encounter. This one-orbit visit could fill any otherwise unscheduled holes in the sequence of Comet Siding Spring observations during the Mars encounter on 19-20 Oct 2014. We will obtain a series of moving-target subarray images of Mars. With WFC3 we mostly alternate between the F410M and F673N filters, with some hedging on exposure times. But we also get a small sweep of other filters. Then to complement John Clarke's related program 13795 we obtain ACS/SBC exposures at the end of the orbit, when the sky is not too bright from direct sunlight. We understand the guide star acquisition required to go from WFC3 to ACS in the middle of the orbit is an overhead hit, but this gives us all the optical imaging we want with WFC3, and also complements the rest of the 22-orbit Mars / Comet Siding Spring HST observing campaign best. Default false false false false false SUPPORTED SOLAR SYSTEM PLANET Mars during the Comet Siding Spring encounter STD=MARS EARTH SOLAR SYSTEM Offset Mars disc to corner of ACS/SBC field of view to image extended H Lyman alpha coronal emission PLANET Planet Mars STD=MARS TYPE=POS_ANGLE,RAD=13,ANG=320,REF=NORTH UV emission line fluxes are given in the text. EARTH 1412349421990 Using ephemeris for target 13936-10-MARS-WFC3 ephemeris data for target 13936-10-MARS-WFC3 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.244. ephemeris interval: 14.243 to 16.245 Using ephemeris for target 13936-10-MARS-ACS-SBC ephemeris data for target 13936-10-MARS-ACS-SBC does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 13.213 to 15.244. ephemeris interval: 14.243 to 16.245 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13936 :visit-id "22" :proposal-version -1 :trans-version "20140605" :date "03-Oct-2014 11:17:01.0" :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 193680 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13936 :visit-id "22" :obset-id "22" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13936 :visit-id "22" :obset-id "A2" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13936 :visit-id "22" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) false 1 0