Assigned ID: 43 ----- Attempting Submission 1 (Sun Feb 19 23:49:33 GMT 2012) ----- HST Phase I Proposal 43 (HST_SMC_SNR_2012.apt) successfully submitted. ----- Attempting Submission 2 (Tue Feb 21 00:27:47 GMT 2012) ----- HST Phase I Proposal 43 (HST_SMC_SNR_2012.apt) successfully submitted. ----- Attempting Submission 3 (Wed Feb 22 16:12:33 GMT 2012) ----- HST Phase I Proposal 43 (HST_SMC_SNR_2012.apt) successfully submitted. ----- Attempting Submission 4 (Fri Feb 24 15:20:06 GMT 2012) ----- ----- Attempting Submission 1 (Sun Jun 10 22:46:24 GMT 2012) ----- ----- Attempting Submission 2 (Mon Nov 05 16:58:58 GMT 2012) ----- 1E 0102-7219 is a highly symmetric, rapidly expanding, supernova remnant in the the Small Magellanic Cloud. We propose to use 1E~0102 to independently derive a geometric distance to the SMC. Scaling the transverse proper motions to match the line-of-sight radial motions directly gives the distance. Previous studies have reported measuring stellar proper motions in the SMC of 1.1 +/- 0.2 mas/yr (a precision of about 17%) for transverse velocities of stars in the SMC of only 300 km/s within a time a baseline of only 2 years. Given that our expansion velocities (peak-to-peak) are around 6,000 km/s (a factor of 20 larger) and that we will have a time baseline between ACS observations of at least 9 years (another factor of 4 larger) we estimate that our SNR proper motions will be measured to better than 1% precision. At this point assumptions in the modeling will dominate the systematics. 1E 0102 is one of the nearest extragalactic test cases for this method and it will be the archetype and testbed for investigating systematics and assessing the potential of this method for determining distances to additional galaxies at larger distances. We are simply requesting a single-orbit ACS observation using the F475W filter for comparison with an identical image taken 9 years ago. Single-orbit image of SMC SNR in the oxygen line. To be used for a proper motion study and distance determination. This is a high-precsion proper motion study. Having the chip oriented north-south as closely the same as the first epoch observation would be very advantageous. The first-epoch observations were made with this same instrument on 2006-10-15. Reference: MAST Dataset = J8R802010 RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false SUPPORTED EXT-MEDIUM SNR This is a high-precsion proper motion study. Having the chip oriented as closely the same as the first epoch observation would be very advantageous. The first-epoch observations were made with this same instrument on 2006-10-15. Mast Dataset = J8R802010 September 24 through Nov 3, 2012 would allow for a 0 degree roll angle (N-S orientation) J2000 J2000 ACS/WFC Imaging No No F475W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false 1352134675275 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /private/var/folders/zz/zzzivhrRnAmviuee++++cU+++86/-Tmp-/OPVisit6346186385848732757.xml (Tic-Visit :proposal-id 12858 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "05-Nov-2012 08:57:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12858 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12858 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2738 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3073 :pcs-gap 0 ) true 1 0