0 Assigned ID: 1981 ----- Attempting Submission 1 (Fri Apr 09 15:52:37 GMT 2021) ----- HST Phase I Proposal 1981 successfully submitted. Receipt: # 1981-1 We greatly appreciate efforts by Christian Soto and Sylvia Baggett in helping us with our phase II, and to Norman Grogin for help with Visit10 . Revised phase II to allow for repeat observations of failed Visit02. Note added: revised phase II 04/26/2022 to add single orbit Visit 10 from one failed orbit (of two) in Visit09. -366003459 ----- Attempting Submission 1 (Wed Jul 28 14:18:30 GMT 2021) ----- ----- Attempting Submission 2 (Mon Apr 04 18:06:24 GMT 2022) ----- ----- Attempting Submission 3 (Tue Apr 26 17:57:29 GMT 2022) ----- Probing the Origins of BST1047+1156, the Most Diffuse Star Forming Galaxy The recently discovered galaxy BST 1047+1156 is the most diffuse star-forming galaxy found to date. Located in the Leo I galaxy group (D=11 Mpc), its extremely diffuse nature tests models of both galaxy formation and star formation at the lowest densities. BST1047's extraordinarily blue optical colors and UV emission both signal a recent episode of star formation in the object, even though its HI column density is well below that in which star formation typically occurs. Exactly how BST1047 formed remains unclear: it may be either a long-lived but extremely diffuse LSB galaxy caught in a tidal interaction, or a recently spawned tidal dwarf caught in the throes of disruption. Either scenario places BST1047 at the extreme limits of our understanding of galaxy evolution processes. To resolve the question of BST1047's origins, we propose deep F606W/F814W imaging to construct a color magnitude diagram of its resolved stellar population and constrain the ages and metallicities of its stars. This will cleanly differentiate between the two formation scenarios, as the presence of old red giant branch stars would rule out the young tidal dwarf model. A purely young stellar population would mark BST1047 as a disrupting tidal dwarf, the first such object known, providing a new link between tidal interactions and dwarf galaxy formation and disruption. We will also place BST1047 on the well-determined stellar mass-metallicity relationship for normal star forming galaxies, providing another important test of its origins. Finally, we will use the BST1047's populations to probe the spatial distribution of recent and past star formation in this anomolous object. The program is to obtain very deep F606W and F814W images of a small, diffuse galaxy near M96. Our goal is to obtain photometry of point sources over the entire FOV, although the target galaxy is small enough that it will fit within a single ACS chip. We are using ACS as primary to get the larger FOV on the target galaxy, and WFC3 in parallel to obtain a 'background' field necessary for our science goals. LOW-SKY is required due to the higher-than-average sky background for targets near the ecliptic plane, and our need to get high enough S/N for very faint point sources. Exposure Times: We are using 2 images per orbit to maximize S/N and to avoid issues with unequal exposure times and buffer dumps when taking 4 LOW-SKY images per orbit. While the images will have correspondingly more CRs, there will be 14 or 16 images in each filter, so many images from which to effectively reject CRs. Aperture: We are using the WFC1 aperture - the object is small (but extended), we want to make sure we sample the region immediately surrounding the object. Thus, we are NOT requesting WFC1-FIX or WFC1-CTE. Visit Locations: The program is split into 7 two orbits visits and one single orbit visit to maximize schedulability: 8 orbits for F606W and 7 for F814W for the primary ACS exposures; the parallel WFC3 images will flip the orbit allocations for the same filters. For each 2-orbit visit, we use a small custom subpixel 4 pt ACS-WFC-DITHER-BOX pattern to sample the PSF in both cameras. Between visits, POS-TARGs are used to create a slightly larger (20 pixel) BOX pattern to keep the sub-pixel dithers comparable over the entire FOV -- we do NOT need to cover the chip gap. (If 20 pixels is too large a pattern we could consider something smaller, but stil larger than the 4-point dither above) The final Visit will use a custom DITHER-LINE to match the first two points of the small, subpixel DITHER-BOX pattern. ORIENT: We are requesting ORIENT angles between 90 and 130 degrees, so that (a) the WFC3 parallel is roughly the same distance from M96 at the ACS field (sampling the contaminating M96 halo stars, and (b) the restricted roll angles will keep the WFC3 parallel field from overlapping two rather bright stars. These limits keep the western bright star over 30" from the WFC3 FOV to avoid 'dragon's breath' Fortunately, this ORIENT range covers the majority of schedulable days, so this choice should have very little impact on the ability to schedule. Reduced Gyro Mode: We are relatively flexible in roll angle and targeting, so if such adjustments need to be made in Reduced Gyro Mode, we can accommodate these (few percent reduction in exposures, changing apertures for guide star acquisition) with little difficulty, The loss of entire orbits, however, would make our project very difficult to execute. Past experience with single guide star guiding resulted in significant image quality degradation, so if we needed to operate under these conditions, our project goals could be difficult to achieve. Pre-Flash: Due to the relatively long exposures (2 images per orbit for each camera), the wide-passbands, and the relatively high sky background (near the ecliptic), we expect WFC3 sky backgrounds of at least 30 e- (assuming a faintest possible sky of MU_V=22.5), so well above the 20e- threshold below which a pre-flash would be required. No pre-flash is required for any of our exposures. The team has significant experience in in Hubble imaging of resolved stellar populations in nearby galaxies and has broad expertise in dwarf galaxies, extragalactic star formation, and galaxy formation and evolution. Dr. Patrick Durrell has extensive experience in data reduction and point-source photometry of faint stellar populations on both ACS and WFC3 images, including multiple projects over the past decade studying the stellar populations in the disks and halos of nearby galaxies. Dr. John Feldmeier is an expert in deep imaging of nearby galaxies and clusters using ground-based telescopes and Hubble. He was involved in the HST M101 study led by Mihos, as well as past deep Hubble imaging of the Virgo Cluster. He also has expertise in extragalactic planetary nebulae and Lyman-alpha galaxies. Dr. Chris Mihos has expertise in deep imaging of nearby galaxies and galaxy clusters, using ground-based telescopes as well as Hubble. He was lead author on the BST1047+1156 discovery paper, and has recently led HST studies of resolved stellar populations in the outskirts of the spiral galaxy M101 (GO-13701) and in the Virgo ultradiffuse galaxy VCC615 (GO-15258). Dr. Stacy McGaugh has broad interests in galaxy formation, the structure and kinematics of galaxies, and stellar populations and star formation across a wide range of galaxy types. He is an expert on both low surface brightness galaxies and dwarf galaxies, and has led a number of papers studying the star forming histories of these kinds of galaxies in both integrated light and resolved stellar populations via Hubble. Dr. Aaron Watkins is an expert in deep imaging techniques, focusing on the study of stellar populations and star formation processes in dwarf galaxies and the diffuse outskirts of spiral disks. He was co-author on the BST1047+1156 discovery paper, as well as the HST study of stellar populations in the outskirts of M101. Galaxies 6 false false false false false false false SUPPORTED EXT-CLUSTER STAR FORMING REGION J2000 J2000 ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false POS-TARG DITHER 0.262 LINE false false 2 20.67 ACS-WFC-DITHER-LINE 2 false POS-TARG DITHER 0.265 LINE false false 2 20.67 ACS-WFC-DITHER-LINE 3 false Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit1929755700218939121.xml Visit 1 - first two orbits with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 1649004524000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "01" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit2000297244920267326.xml Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. Visit 2 - orbits 3-4 s with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 1648758700000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "02" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit16785348635848315121.xml Visit 02/09 repeat - orbit 3 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are matched to exposure 1&2 in a 4 point subpixel dither box pattern to overcome bad/hot pixels (Tic-Visit :proposal-id 16762 :visit-id "10" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:51:47.0" :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 40.0 :data-volume 1145936 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "10" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit10849833485598550605.xml Visit 9 (repeat observation of failed Visit 02) - orbits 3-4 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 1650456783000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "09" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "09" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "09" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit2292358706600301537.xml Visit 2 - orbits 5-6 with ACS+F606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels 1649084583000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "03" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit13858002694805357779.xml Visit 4 - final (of 4) pair of orbits with ACS+606W, and WFC3 parallel F814W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. 1649096018000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "04" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "04" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit8185637787508231894.xml Visit 5 -first pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F814W observations. 1649427677000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "05" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "05" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit18441106620248669266.xml Visit 6 -second pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 1649502021000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "06" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "06" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit15858588655642675534.xml Visit 7 -third pair of orbits with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 4 point subpixel dither box pattern to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 1649513459000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "07" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 2291872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "07" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 16762 :visit-id "07" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2701 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10) The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. /private/var/folders/1b/yx3zlx911zl6np_bzjrqc4245gvmgy/T/OPVisit14915211106396558017.xml Visit 5 -single orbit with ACS+F814W, and WFC3 parallel F606W. Observations within visit are in a 2 point dither line pattern (mimicing half of dither-box used in previous visits) to overcome bad/hot pixels. Using same box pattern between visits as with the F606W observations. 1648032758000 106.97000000000003 (Tic-Visit :proposal-id 16762 :visit-id "08" :proposal-version -1 :trans-version "20211222" :date "26-Apr-2022 13:53:11.0" :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 40.0 :data-volume 1145936 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16762 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16762 :visit-id "08" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2748 :al-overhead-at-end 55 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 1 0