switch visits 1 and 2. 1 now 4 orbits. Added betweens requested by PI ----- Attempting Submission 1 (Mon Jul 21 01:18:35 GMT 2008) ----- ----- Attempting Submission 2 (Fri May 29 15:57:43 GMT 2009) ----- Assigned ID: 480 ----- Attempting Submission 1 (Fri Mar 07 19:03:27 GMT 2008) ----- The Light Echoes around V838 Monocerotis V838 Monocerotis, which burst upon the astronomical scene in early 2002, is a completely unanticipated new object. It underwent a large-amplitude and very luminous outburst, during which its spectrum remained that of an extremely cool supergiant. A rapidly evolving set of light echoes around V838 Mon was discovered soon after the outburst, and quickly became the most spectacular display of the phenomenon yet seen. These light echoes provide the means to accomplish three unique types of measurements based on continued HST imaging during the event: (1) Study effects of MHD turbulence at high resolution and in 3 dimensions; (2) Construct the first unambiguous and fully 3-D map of a circumstellar dust envelope in the Milky Way; (3) Study dust physics in a unique setting where the spectrum and light curve of the illumination, and the scattering angle, are unambiguously known. We have also used our HST data to determine the distance to V838 Mon through a novel direct geometric technique. Because of the extreme rarity of light echoes, this is almost certainly the only opportunity to achieve such results during the lifetime of HST. We propose two visits during Cycle 17, using the repaired ACS (or WFC3) in order to continue the mapping of the circumstellar dust and to accomplish the other goals listed above.
This program contains two visits, 3 and 4 orbits each, for imaging of the light echo around V838 Mon with the ACS/WFC. Images will be taken in I (F814W). We will use a 3-point dither to remove the gap between the chips for the first visit, with 3 exposures at each of the 3 points. For the second visit there is a 4-point dither. The visits will be roughly equally spaced during Cycle 17, one as soon after SM4 as practical, and the second in September 2009. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false false SUPPORTED ISM EJECTA PLANETARY NEBULA REFLECTION NEBULA WIND Geometric center of light echo, based on data from Cycle 14. 6/14/06: updated to ICRS reference frame, using galex website. J2000 07 04 4.8000 -03 50 50.00 J2000 ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F814W POS-TARG DITHER 2.994 LINE false true 3 85.27 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 2.994 LINE false true 4 85.27 ACS-WFC-DITHER-LINE 2 false The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit16805.xml (Tic-Visit :proposal-id 11713 :visit-id "01" :proposal-version -1 :trans-version "20090130" :date "29-May-2009 11:55:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 3410688 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11713 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2839 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3174 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 2979 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3174 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 3 :pcs-time 195 :si-vis-utilization 2979 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3174 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 4 :pcs-time 195 :si-vis-utilization 2979 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3174 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 11713 :visit-id "01" :proposal-version -1 :trans-version "20080624" :date "20-Jul-2008 21:16:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11713 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 2937 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11713 :visit-id "01" :orbit-number 3 :pcs-time 195 :si-vis-utilization 2937 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3132 :pcs-gap 0 ) false 3 0