Cannot find file /Users/dzb0059/Downloads/HST_Cycle_33___C2024_E1_Wierzchos-8.pdf For G160M observations, please consult Chapter 9 of the COS Instrument Handbook to estimate overheads and the number of exposures per orbit, and consequently the correct lifetime position. Use of LP4 with G160M requires justification in the "Special Requirements" section of the Phase I PDF. Use of the default LP6 with G160M requires no justification. Proposals can be submitted with the warning present. For G160M observations, please consult Chapter 9 of the COS Instrument Handbook to estimate overheads and the number of exposures per orbit, and consequently the correct lifetime position. Use of LP4 with G160M requires justification in the "Special Requirements" section of the Phase I PDF. Use of the default LP6 with G160M requires no justification. Proposals can be submitted with the warning present. For G160M observations, please consult Chapter 9 of the COS Instrument Handbook to estimate overheads and the number of exposures per orbit, and consequently the correct lifetime position. Use of LP4 with G160M requires justification in the "Special Requirements" section of the Phase I PDF. Use of the default LP6 with G160M requires no justification. Proposals can be submitted with the warning present. For G160M observations, please consult Chapter 9 of the COS Instrument Handbook to estimate overheads and the number of exposures per orbit, and consequently the correct lifetime position. Use of LP4 with G160M requires justification in the "Special Requirements" section of the Phase I PDF. Use of the default LP6 with G160M requires no justification. Proposals can be submitted with the warning present. 0 Assigned ID: 6579 ----- Attempting Submission 1 (Thu Apr 10 18:10:59 GMT 2025) ----- HST Phase I Proposal 6579 successfully submitted. Receipt: # 6579-1 ----- Attempting Submission 2 (Thu Apr 10 21:55:45 GMT 2025) ----- We will use the default LP6 with G160M This target is not used in this proposal. This target is not used in this proposal. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. For the best data quality, it is generally required to use all four FP-POS positions at a given COS cenwave (or 2 positions for certain exception cases). See extended explanation in the diagnostic browser. COS FUV PSA science exposures with extended targets have special calibration limitations. See "Errors and Warnings" for more details. V1: Submitting with known schedulability errors due to coordinated rool restrictions, per instruction by A. Vick. V2: Submitting clean Phase 2 w/ C/2025 K1 as a target, with 100% schedulability in Cycle 33. V3: Split 2 orbit COS visits into 1 orbit visits to improve GS acquisition. V4: Changed COS exposures from ACCUM to TIMETAG. Buffer-time is set to exposure time length (670 secs, but advise if this should be set to 900s basedon on orbital planner) V5: Updated Buffer-time to 900s to avoid two dumps. V6: Added new target C2025K1_v2 using orbital solution #13 from JPL Horizons for A. Vick to duplicate visits and test bright object windows. 1349657731 ----- Attempting Submission 1 (Fri Aug 08 18:02:49 GMT 2025) ----- HST Phase II Proposal 18135 successfully submitted. Receipt: # 18135-1 ----- Attempting Submission 2 (Wed Aug 13 16:09:08 GMT 2025) ----- HST Phase II Proposal 18135 successfully submitted. Receipt: # 18135-2 ----- Attempting Submission 3 (Thu Aug 14 15:56:42 GMT 2025) ----- ----- Attempting Submission 4 (Wed Sep 24 14:15:26 GMT 2025) ----- HST Phase II Proposal 18135 successfully submitted. Receipt: # 18135-4 ----- Attempting Submission 5 (Wed Sep 24 15:35:08 GMT 2025) ----- ----- Attempting Submission 6 (Wed Oct 29 17:12:44 GMT 2025) ----- 1. The original target, C/2024 E1, is no longer used for the visits. I left it in the Phase 2 for transparency. 2. 8 of these warnings are regarding our FP-POS lifetime positions. We cycle through all 4 FP-POS's twice during our 8 COS orbits and will be co-adding our COS data, so we don't believe we need to use the ALL keyword for each visit. 2. The remaining 8 warnings are from the COS FUV PSA extended target limitations. We understand the calibration limitations when using COS for extended objects. Examining Cometary Volatile Storage Mechanisms with HST Observations of C/2024 E1 (Wierzchos) Sulfur is a critical yet poorly understood component of protoplanetary disk chemistry, with less than 0.1% of its cosmic abundance observed in the gas phase. Comets, as chemically primitive bodies formed in the solar nebula midplane, are key tracers of early disk composition. This proposal targets Comet C/2024 E1 (Wierzchos), a dynamically new Oort Cloud Comet with a close perihelion (0.57 au). As near-surface layers are thermally processed and stripped during solar passage, post-perihelion observations provide a unique opportunity to probe deeper, less-altered material when the coma most closely reflects the nucleus. Using HST's ultraviolet capabilities, we will measure production rates of H2O, CO, atomic carbon, and sulfur-bearing species (S, CS, S2) to derive the comet's C/O and S/O ratios, key tracers of formation conditions and chemical inheritance. These observations will test predictions of volatile depletion, sulfur sequestration, and thermal evolution in the early solar system, and provide essential constraints on the sulfur depletion problem in disk chemistry. We will observe comet C/2024 E1 with STIS and COS for a total of 12 orbits once it emerges from the solar keep-out zone post-perihelion, between March 7-21, 2026, when it's V-mag predicted to be 9-10. To maximize scientific return, our strategy includes 8 orbits of COSG160M to measure the SI multiplet at 1479 Angstroms and 4 orbits of STIS G230L to detect CS and OH, with simultaneous sensitivity to S2. COS will cover SI multiplets at 1479 and 1667 Angstroms, CI features at 1561 Angstroms and 1657 Angstroms, and CO Fourth Positive Group emission features (1400-1670 Angstroms). STIS, with a 52x0.5"aperture (1570-3180 Angstroms), will capture the CO Cameron bands between 1900 Angstroms and 2300 Angstroms , C2 at 2313 Angstroms CS (A-X) at 2576 Angstroms, S2 via vibrational bands between 2828-3055 Angstroms, and OH (A-X) at 2835 and 3085 Angstroms. Only HST has the UV sensitivity and spectral coverage (1600-3000 Angstroms) required for this full suite of species. The team brings extensive experience in comet observations and multi-wavelength data analysis, including ultraviolet spectroscopy and modeling of cometary activity and composition. Members include expert observers, modelers, and data analysts who have developed and applied sophisticated techniques to interpret cometary emissions across UV, optical, and radio wavelengths. All team members will contribute to data integration across instruments and participate in the preparation of scientific publications. The PI and team lead, Dr. Dennis Bodewits (Auburn University), is a recognized expert in comet activity and coma physics, with leadership roles on the Rosetta and EPOXI missions. He has led major comet observing campaigns with HST, Chandra, XMM-Newton, and Swift, and has developed novel techniques for reducing UVOT grism and photometric data. He is PI of the Swift program monitoring Comet C/2024 E1. Dr. John Noonan (Auburn University), Assistant Research Professor, has extensive experience with far-ultraviolet observations of comets using both HST and the Rosetta Alice UVS. He specializes in the analysis of cometary emission spectra and temperature retrieval techniques. Dr. Michael Combi (University of Michigan) is a leading expert in cometary coma modeling and has long-standing experience with the scheduling and analysis of SOHO/SWAN Ly-a observations. Dr. Colin Snodgrass (University of Edinburgh) is an expert in ground-based comet observations and is PI of the JWST observing program for Comet C/2024 E1. Dr. Kacper Wierzchos (University of Arizona), who discovered Comet C/2024 E1, is an experienced radio observer of comets and will lead supporting observations with the Arizona Radio Observatory (ARO). GAI Statement: In preparing this proposal, generative AI (GAI) tools were used to assist with grammar refinement and clarity of expression only. All scientific content, analysis plans, and interpretations were developed solely by the investigators. No proprietary or confidential information was entered into any GAI system. The team is aware that any content generated with GAI tools is considered to be in the public domain, and has ensured that no sensitive or unpublished material was exposed in this process. Solar System Astronomy 6 false true false false false false false SUPPORTED SOLAR SYSTEM YES COMET Comet C/2024 E1 (Wierzchos) TYPE=COMET,Q=0.5657650229789531,E=1.000046249044321,I=75.23814370191654 ,O=108.0839600779679,W=243.642189740609,T=20-JAN-2026:18:06:46,TTimeScale=TDB,EQUINOX=J2000,EPOCH=13-FEB-2025:00:00:00,EpochTimeScale=TDB EARTH SOLAR SYSTEM YES COMET C/2025 K1 TYPE=COMET,Q=0.3341775465431033,E=1.000258561145607,I=147.8642063372146 ,O=97.55768581282922,W=271.0280864615683,T=08-OCT-2025:10:32:26,TTimeScale=TDB,EQUINOX=J2000,EPOCH=23-JUL-2025:00:00:00,EpochTimeScale=TDB EARTH SOLAR SYSTEM YES Using JPL Horizons version #13 for orbital ephemeris COMET C2025K1v2 TYPE=COMET,Q=0.3342083770239909,E=1.000280680346033,I=147.8651441817135 ,O=97.55608189140362,W=271.0229127199095,T=08-OCT-2025:10:32:46,TTimeScale=TDB,EQUINOX=J2000,EPOCH=24-JUL-2025:00:00:00,EpochTimeScale=TDB EARTH STIS/NUV-MAMA Spectroscopic No No G230L 2376 COS/FUV Spectroscopic No No G160M 1589 STIS/NUV-MAMA Spectroscopic No No G230L 2376 COS/FUV Spectroscopic No No G160M 1589 STIS/NUV-MAMA Spectroscopic No No G230L 2376 COS/FUV Spectroscopic No No G160M 1589 STIS/NUV-MAMA Spectroscopic No No G230L 2376 COS/FUV Spectroscopic No No G160M 1589 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 18135 :visit-id "08" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 95760 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "08" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1786 :al-overhead-at-end 0 :internal-dur-at-end 424 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/sherwin/18135/OP-cache/18135-v28.xml 1762811378000 298.1837488769885 (Tic-Visit :proposal-id 18135 :visit-id "28" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 15:13:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 78384 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "28" :obset-id "28" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "28" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1556 :al-overhead-at-end 0 :internal-dur-at-end 405 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18135 :visit-id "09" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 124208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "09" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2238 :al-overhead-at-end 0 :internal-dur-at-end 434 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) true 1 0 1762714945000 298.546355561352 (Tic-Visit :proposal-id 18135 :visit-id "09" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 124208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "09" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2238 :al-overhead-at-end 0 :internal-dur-at-end 434 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18135 :visit-id "10" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 95760 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "10" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1786 :al-overhead-at-end 0 :internal-dur-at-end 424 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/sherwin/18135/OP-cache/18135-v30.xml 1762879519000 298.21 (Tic-Visit :proposal-id 18135 :visit-id "30" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 15:18:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 78384 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "30" :obset-id "30" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "30" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1556 :al-overhead-at-end 0 :internal-dur-at-end 405 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18135 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 95760 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "11" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1786 :al-overhead-at-end 0 :internal-dur-at-end 424 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) true 1 0 1763020308000 296.0 (Tic-Visit :proposal-id 18135 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 95760 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "11" :orbit-number 1 :pcs-time 301 :si-vis-utilization 1786 :al-overhead-at-end 0 :internal-dur-at-end 424 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18135 :visit-id "12" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 124208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "12" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2238 :al-overhead-at-end 0 :internal-dur-at-end 434 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) true 1 0 1762776817000 300.1296848009197 (Tic-Visit :proposal-id 18135 :visit-id "12" :proposal-version -1 :trans-version "20250624" :date "29-Oct-2025 13:09:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 124208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18135 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18135 :visit-id "12" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2238 :al-overhead-at-end 0 :internal-dur-at-end 434 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2619 :pcs-gap 0 ) false 1 0