Assigned ID: 781 ----- Attempting Submission 1 (Fri Feb 26 23:17:34 GMT 2010) ----- ----- Attempting Submission 1 (Sun Jul 11 00:18:03 GMT 2010) ----- 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 one visit during Cycle 18, using ACS, in order to continue the mapping of the circumstellar dust and to accomplish the other goals listed above.
This program contains one 5-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 5 exposures at each of the 3 points. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false 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 POS-TARG DITHER 3.011 LINE false true 3 85.28 ACS-WFC-DITHER-LINE 1 false /var/tmp/OPVisit41246.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12297 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "10-Jul-2010 20:05:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 4263360 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12297 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12297 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2899 :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 3234 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12297 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3012 :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 3234 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12297 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3012 :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 3234 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12297 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3012 :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 3234 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12297 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3012 :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 3234 :pcs-gap 0 ) true 5 0