Assigned ID: 197 ----- Attempting Submission 1 (Thu Feb 24 21:04:00 GMT 2011) ----- HST Phase I Proposal 197 (v838mon_c19.apt) successfully submitted. ----- Attempting Submission 2 (Sun Feb 27 20:20:32 GMT 2011) ----- ----- Attempting Submission 1 (Tue Jul 05 18:01:25 GMT 2011) ----- 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, and the results showed that V838 Mon had a maximum luminosity brighter than a classical nova. Because of the extreme rarity of light echoes, this is almost certainly the only opportunity to achieve such results during the lifetime of HST. Similar intermediate-luminosity red transients are now being discovered in nearby galaxies, and it has become important to understand the physics of their outbursts and the nature of their progenitors. We propose one visit during Cycle 19, using ACS, in order to continue the mapping of the circumstellar dust and to accomplish the other goals listed above.
This program contains one 6-orbit visit 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, with 6 exposures at each of the 3 points. The observation should be done near the end of Cycle 19. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 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 J2000 ACS/WFC Imaging No No F814W POS-TARG DITHER 3.011 LINE false true 3 85.28 ACS-WFC-DITHER-LINE 1 false The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. /user/bond/klingsor1/hstcycle19/v838mon/OP-cache/12599-v01.xml (Tic-Visit :proposal-id 12599 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "04-Jul-2011 16:59:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 6 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 5116032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12599 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2848 :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 3182 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2958 :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 3182 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2958 :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 3182 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2958 :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 3182 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2958 :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 3182 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12599 :visit-id "01" :orbit-number 6 :pcs-time 222 :si-vis-utilization 2958 :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 3182 :pcs-gap 0 ) true 6 0