0 Assigned ID: 5268 ----- Attempting Submission 1 (Mon Mar 25 23:29:28 GMT 2024) ----- HST Phase I Proposal 5268 successfully submitted. Receipt: # 5268-1 ----- Attempting Submission 2 (Tue Mar 26 04:48:18 GMT 2024) ----- HST Phase I Proposal 5268 successfully submitted. Receipt: # 5268-2 POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. 0 ----- Attempting Submission 1 (Thu Aug 15 15:18:24 GMT 2024) ----- I have contacted my PC about these warnings. While the positioning looks correct in Aladin, the warnings refer to using POS-TARGs and PATTERN together with ACS ramp filters. I am not specifying any explicit POS-TARGs (only PATTERNs), but my PC explained that ramp filters have positions associated with them, like POS-TARGs, to put the spectrum in the right place. She asked me to submit with the warnings, so that the CS could review them further to make sure they aren't actually a problem for my program. Ionization Echoes of Fading AGN Understanding how and why Active Galactic Nuclei (AGN) vary in ionizing output can provide insight into the physics of AGN accretion and fueling. "Green Bean" nebulae at z~0.3 surround powerful AGN that show evidence of having ramped down in ionizing output by 3-4 orders of magnitude over the past 10,000-100,000 years; this significant variability will be imprinted as an ionization echo within the surrounding extended emission line gas. Leveraging a successful recombination balance approach demonstrated previously for a sample of lower redshift Seyfert-class systems, we propose to obtain HST ACS ramp filter Halpha and [OIII] imaging and WFC3 continuum imaging of Green Bean nebulae in order to constrain the ionization histories of luminous AGN at high spatial, and therefore time, resolution. In addition, when combined with existing HST Lyman-alpha and UV continuum imaging of the Green Beans, the proposed observations will provide insight into the importance of Lyman-alpha resonant scattering within extended emission line nebulae, while benefitting from lower surface brightness dimming than at higher redshifts and avoiding the issue of geocoronal Lyman-alpha contamination that can plague local galaxy studies. We propose to obtain HST ACS ramp filter imaging of redshifted [OIII] and Halpha plus WFC3-UVIS and IR continuum imaging for six "Green Bean" nebulae at z~0.3 in order to map out the ionization histories of these luminous Active Galactic Nuclei (AGN) at high spatial, and therefore time, resolution. ~~ACS Ramp Filter Imaging~~ Filters -- Our targets are at z~0.281-0.341. We will use ramp filters FR656N and FR853N with central wavelengths set to match redshifted [OIII] and Halpha for each target. For FR656N, that corresponds to central wavelengths of 6416-6716A, and for FR853N, that corresponds to central wavelengths of 8409-8803A. Aperture -- For FR656N, we will use the default WFC1-MRAMP aperture. For FR853N, we will use the default WFC1-IRAMP aperture. Dither Pattern -- We do not need to dither over the chip gap. To minimize CTE issues, we will prioritize longer exposure times and use a 2-point ACS-WFC-DITHER-LINE dither pattern (#12 from the online ACS "Dither Strategies" manual). This will allow us to improve the sampling of the point spread function and help address image artifacts and cosmic rays. Exposure times -- Exposure times are set to maxmize on-target exposure during each orbit. ~~WFC3-UVIS Continuum Imaging~~~ Aperture -- To minimize CTE issues, we will use the UVIS2-C1K1C-CTE aperture. This aperture is centered ~20" from the edge of the image, and so will contain the full extent of each of our targets (4-9" in radius). Dither Pattern -- We do not need to dither over the chip gap. To minimize CTE issues, we will prioritize longer exposure times by using the default 2-point WFC3-UVIS-DITHER-LINE dither pattern. This will allow us to improve the sampling of the point spread function and help address image artifacts and cosmic rays. Flash -- In the case of one target (GB0113+0106), we apply a post-flash of FLASH=3 electrons, which is needed to achieve the recommended 20 electrons of background to minimize CTE issues given default background assumptions (low zodiacal light, average earth shine, average air glow). Exposure times -- Exposure times are set to maxmize on-target exposure during each orbit. ~~WFC3-IR Continuum Imaging~~~ Aperture -- We will use the standard IR aperture. We note that, due to the choice of the UVIS2-C1K1C-CTE aperture for UVIS, the IR and UVIS imaging will only partially overlap. However, this will allow us to obtain high resolution HST imaging for a larger number of surrounding galaxies, which will be useful for ancillary science on the local environments of our targets. Dither Pattern -- We will use the WFC3-IR-DITHER-BLOB dither pattern to address "IR blobs", and then the subpattern WFC3-IR-DITHER-LINE to improve the sampling of the point spread function and better address image artifacts and cosmic rays. Exposure times -- Exposure times are set by the combination of SAMP-SEQ and NSAMP. Based on the WFC3 Instrument Manual, for F098M (two targets) we need 586s exp to get to the background limited regime. Therefore, we will use SAMP-SEQ=SPARS50 and NSAMP=12, which is the maximum number of reads that will fit into the orbit, given 4 dither positions (WFC3-IR-DITHER-BLOB plus WFC3-IR-DITHER-LINE). For F105W (4 targets), we need 360s exp to get to the background limited regime, but we also want to maximize exposure time during the orbit. Therefore, we will use the same SAMP-SEQ=SPARS50 and NSAMP=12, the maximum number of reads that will fit into the orbit, given 4 dither positions (WFC3-IR-DITHER-BLOB plus WFC3-IR-DITHER-LINE). Audrey Dijeau is a PhD student working on simulating low redshift emission line nebulae and identifying larger samples using ground-based imaging surveys. William Keel has extensive experience in analyzing imaging of extended emission regions around AGN, including HST ACS ramp filter data. Some results have appeared in MNRAS 420, 878 (2012); AJ 144, 66 (2012); ApJ 835, 256 (2017); and MNRAS 438, 4847 (2019). Moire Prescott has prior experience working with HST WFC3 and ACS broadband and ramp filter imaging on high redshift Lya nebulae (Prescott et al, 2012, ApJ, 752, 86) and with ground-based multiwavelength broadband/narrowband imaging and longslit/IFU spectroscopy, data that will be used to complement the proposed HST dataset. Kelly Sanderson is a PhD student studying low and high redshift emission line nebulae. She has expertise in working with ground-based IFU observations and radio observations, data that will be used to complement the proposed HST dataset. Supermassive Black Holes and Active Galaxies Intergalactic Medium and the Circumgalactic Medium 6 false false false false false false false SUPPORTED GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=18.5 GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=17.9 GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=18.7 GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=18.5 GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=17.9 GALAXY EMISSION LINE NEBULA SEYFERT YES J2000 J2000 SDSSr=18.3 ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F763M WFC3/IR Imaging No No F098M ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F775W WFC3/IR Imaging No No F098M ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F775W WFC3/IR Imaging No No F105W ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F775W WFC3/IR Imaging No No F105W ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F775W WFC3/IR Imaging No No F105W ACS/WFC RampFilter No No FR656N ACS/WFC RampFilter No No FR853N WFC3/UVIS Imaging No No F775W WFC3/IR Imaging No No F105W POS-TARG DITHER 0.149 LINE false false 2 34.25 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 2 false POS-TARG DITHER DITHER 2 5.183 WFC3-IR-DITHER-LINE false true 0.636 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 41.788 3 true The scheduling data was generated by CASM 32.1.1. 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CASM was run in Phase II mode. 1741526876000 315.5086945914491 (Tic-Visit :proposal-id 17831 :visit-id "03" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 11:00:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2620 :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 3005 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "03" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2620 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3005 :pcs-gap 0 ) false 2 0 /System/Volumes/Data/solaris/user1/sherwin/17831/OP-cache/17831-v53.xml HOPR repeat of orbit 1 of visit 3 1769273983000 294.8160370425579 (Tic-Visit :proposal-id 17831 :visit-id "13" :proposal-version -1 :trans-version "20241217" :date "18-Mar-2025 15:09:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "13" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2620 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3005 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1741696825000 308.0166315785621 (Tic-Visit :proposal-id 17831 :visit-id "04" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 11:00:53.0" :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 20.0 :data-volume 1482752 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2620 :al-overhead-at-end 116 :internal-dur-at-end 31 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3005 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "04" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2506 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3005 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1771189087000 238.02083282925196 (Tic-Visit :proposal-id 17831 :visit-id "05" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 10:40:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "05" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2694 :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 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "05" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2694 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.1. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 1771793062000 273.29940319063076 (Tic-Visit :proposal-id 17831 :visit-id "09" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 10:40:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "09" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2638 :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 3023 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "09" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2638 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) true 2 0 /System/Volumes/Data/solaris/user1/sherwin/17831/OP-cache/17831-v56.xml HOPR copy of visit 9 (orbit 2) (Tic-Visit :proposal-id 17831 :visit-id "56" :proposal-version -1 :trans-version "20250929" :date "27-Mar-2026 09:01:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "56" :obset-id "56" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "56" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2596 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1771855151000 285.11763857215647 (Tic-Visit :proposal-id 17831 :visit-id "10" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 10:40:49.0" :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 20.0 :data-volume 1482752 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "10" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2638 :al-overhead-at-end 116 :internal-dur-at-end 31 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "10" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2506 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. /System/Volumes/Data/solaris/user1/sherwin/17831/OP-cache/17831-v11.xml 1753097104000 242.17728219415403 (Tic-Visit :proposal-id 17831 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "24-Jul-2025 13:25:49.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "11" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2630 :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 2977 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "11" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2626 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2977 :pcs-gap 0 ) true 2 2 /System/Volumes/Data/solaris/user1/sherwin/17831/OP-cache/17831-v54.xml 1754929827000 250.73261782714712 (Tic-Visit :proposal-id 17831 :visit-id "54" :proposal-version -1 :trans-version "20250624" :date "24-Jul-2025 13:26:48.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "54" :obset-id "54" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "54" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2608 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2977 :pcs-gap 0 ) true 1 1 /System/Volumes/Data/solaris/user1/sherwin/17831/OP-cache/17831-v55.xml HOPR copy of visit 54 1756117828000 253.44893979210246 (Tic-Visit :proposal-id 17831 :visit-id "55" :proposal-version -1 :trans-version "20250624" :date "13-Aug-2025 15:09:51.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "55" :obset-id "55" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "55" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2608 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2977 :pcs-gap 0 ) true 1 1 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1752728731000 244.79343495262367 (Tic-Visit :proposal-id 17831 :visit-id "12" :proposal-version -1 :trans-version "20240604" :date "15-Aug-2024 10:40:51.0" :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 20.0 :data-volume 1482752 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17831 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17831 :visit-id "12" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2630 :al-overhead-at-end 116 :internal-dur-at-end 31 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3010 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17831 :visit-id "12" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2506 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3010 :pcs-gap 0 ) false 2 0