Assigned ID: 853 ----- Attempting Submission 1 (Fri Feb 24 22:49:45 GMT 2012) ----- We feel that any further suggestion on how to deal with the WFC3/UVIS CCD's CTE issue would be extremely helpful. In the light of the extended nature of the target, for the moment we have chosen the optimum center of CCD1 as pointing reference where to put the jet's central source. The support team may want to suggest a better pointing position, in the light of the recent CTE white paper. ----- Attempting Submission 1 (Mon Jul 09 22:32:23 GMT 2012) ----- HST Phase II Proposal 12868 (sandy_phase2.apt) successfully submitted. ----- Attempting Submission 2 (Tue Aug 28 13:47:20 GMT 2012) ----- An exceptionally large jet was recently discovered around the enigmatic LMC source known as Sanduleak's star (Angeloni et al. 2011 ApJ 743, L8). To our knowledge, with a physical extent of 14 parsecs, it represents the largest stellar jet ever discovered, and the first clearly resolved stellar jet beyond the Milky Way. Because of these exceptional properties, we expect that it will become a key target where to study the formation and evolution of astrophysical jets. While the ground based images have highlighted the exceptional nature of the source and its gross morphology, their limited resolution prevents a thorough discussion of the jet's properties, origin and expansion through the surrounding environment. In order to largely improve our knowledge of the system, we propose here to obtain deep, narrow-band images in the Halpha (F656N), [NII] (F658N) and [SII] (F673N) emission lines by exploiting both the superb spatial resolution and large field of view of WFC3/UVIS. With a reasonably short amount of telescope time, the HST observations would provide immediate scientific results, would help in the preparation of follow-up spectroscopic proposals, and would have a high PR value, considering both the outstanding properties of the jet of Sanduleak's star, and the likely spectacular outcome of the proposed imagery. Recently, we have discovered a remarkable jet from a puzzling source in the LMC that is commonly known as Sanduleak's star (Angeloni et al. 2011 ApJL, 743, 8). With a physical extent of 14 parsecs, it is the largest stellar jet ever discovered, and the first resolved stellar jet beyond the Milky Way. Given these remarkable characteristics, we had proposed to obtain with HST deep, narrow-band images of the Halpha, [NII]6583, and [SII]6731 emission lines, in order to derive the fundamental physical diagnostics of the jet by making advantage of both the superb spatial resolution and large field of view of WFC3/UVIS. The jet total extension of 58 arcsec means that we can use the subarray UVIS 1 to place the central, bright source (V=17.4+-0.1) at the optimum center of CCD 1. We also introduced an orientation constraints in order to keep the jet axis (PA 71°) as much parallel as possible to the chip major axis. In order to increase the efficiency of the observations - i.e., by both avoiding the large overheads due to the duffer bump and maximizing the time on target - we opt for the WFC3-UVIS-DITHER-BOX dither pattern. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED EXT-STAR EJECTA EMISSION LINE NEBULA INTERACTING BINARY JET SYMBIOTIC STAR This object was generated by the targetselector and retrieved from the SIMBAD database. The object is in the Large Magellanic Cloud. LMC-ANONYMOUS J2000 J2000 WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F658N WFC3/UVIS Imaging No No F673N POS-TARG DITHER 0.173 LINE 0.112 false true 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false 1346159508572 /tmp/OPVisit5856560140434898589.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. We introduced a visit orientation constraint in order to keep the jet axis (PA 71°) as much parallel as possible to the chip major axis. (Tic-Visit :proposal-id 12868 :visit-id "01" :proposal-version -1 :trans-version "20120615" :date "28-Aug-2012 15:11:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12868 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12868 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3299 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12868 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3410 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12868 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3410 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) true 3 0