0 Assigned ID: 6927 ----- Attempting Submission 1 (Fri Sep 26 17:54:05 GMT 2025) ----- This resubmission breaks up the single visit into 6 separate one-orbit visits, now with SAME ORIENT applied to all, to ease scheduling and mitigate the risk of GS failure. -- Max Mutchler -1670761881 ----- Attempting Submission 1 (Fri Oct 10 20:36:48 GMT 2025) ----- ----- Attempting Submission 2 (Wed Oct 22 18:12:32 GMT 2025) ----- Narrowband observations of protostellar outflows in M20 We propose to image dense pillars within the star forming nebula, M20. Imaging in F502N, F656N, and F673N will identify variations of density and ionization in the atomic gas surrounding this active area of star formation and highlight protostellar outflows emerging from the pillar, the proper motion of which will be measured in comparison to archival observations of the region. Broadband imaging in F475W and F814W will enable accurate measurement of stellar colors in the field. We will obtain high signal-to-noise imaging of the M20 "Snail" (HH 399) in narrowband filters F502N, F656N, and F673N, as well as broadband filters F475W and F814W. The B and I filters will provide a balanced color profile to the stars in the image, while the [O III], H-alpha, and [SII] narrowband filters will highlight regions of differing density and ionization state through the nebula. Additionally, the F656N filter will enable a direct comparison to archival WFPC2 H-alpha images in order to highlight the proper motion of the jet. We propose a single WFC3 pointing which will adequately cover the entire object at the Position Angles available in Reduced Gyro Mode. We will employ a dither pattern which fills the chip gaps and enables cosmic ray rejection. We calculate exposure times from archival observations of this object with WFPC2. Using the WFC3 ETC, we estimate that we can achieve the high signal-to-noise needed for imaging with 6 orbits, with approximately 5 ks for F656N, 6 ks for F502N, and 7 ks for F673N. The broadband filter exposures can be placed as short bookends to the narrowband observations. Proper motion was measurable as early as 5 years after the initial observations in 1997 taken under HST program ID 6857 (PI Trauger), in data taken in 2002 under HST program ID 11121 (PI Yusef-Zadeh) (Yusef-Zadeh, Biretta, & Wardle, 2005). The team has a wealth of experience in making outreach images for the Hubble Space Telescope and is responsible for creating Hubble images viewed by billions of people world-wide, including the 31st, 32nd, 33rd, 34th, and 35th anniversary images which together were viewed over 4 billion times. The team includes decades of experience in writing Hubble news releases, designing informal educational and outreach products based on Hubble data, as well as instrument expertise in designing observations and treatment of Hubble data. Stellar Populations and the Interstellar Medium 6 false SUPPORTED ISM HERBIG-HARO OBJECT YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 WFC3/UVIS Imaging No No F502N WFC3/UVIS Imaging No No F673N WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F814W /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v11.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18209 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "22-Oct-2025 14:08:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1723440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18209 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18209 :visit-id "11" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2518 :al-overhead-at-end 125 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v12.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18209 :visit-id "12" :proposal-version -1 :trans-version "20250624" :date "22-Oct-2025 12:34:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1723440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18209 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18209 :visit-id "12" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2519 :al-overhead-at-end 127 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v13.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18209 :visit-id "13" :proposal-version -1 :trans-version "20250624" :date "22-Oct-2025 12:34:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1723440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18209 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18209 :visit-id "13" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2518 :al-overhead-at-end 125 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v14.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18209 :visit-id "14" :proposal-version -1 :trans-version "20250624" :date "22-Oct-2025 12:34:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1723440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18209 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18209 :visit-id "14" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2519 :al-overhead-at-end 127 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v15.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18209 :visit-id "15" :proposal-version -1 :trans-version "20250624" :date "22-Oct-2025 12:34:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1723440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18209 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18209 :visit-id "15" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2518 :al-overhead-at-end 125 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 /Users/mutchler/Desktop/APT/18209_m20/OP-cache/18209_m20_dither6-v16.xml Hst Same orient constraint links visits (11 12 13 14 15 16) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 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