0 Assigned ID: 6437 ----- Attempting Submission 1 (Thu Apr 10 13:24:07 GMT 2025) ----- HST Phase I Proposal 6437 successfully submitted. Receipt: # 6437-1 ----- Attempting Submission 2 (Thu Apr 10 22:19:01 GMT 2025) ----- HST Phase I Proposal 6437 successfully submitted. Receipt: # 6437-2 ----- Attempting Submission 3 (Thu Apr 10 23:24:53 GMT 2025) ----- Thank you for your help. Please let me know if any changes are needed. -536346737 ----- Attempting Submission 1 (Tue Aug 12 17:23:45 GMT 2025) ----- Multiwavelength Extinction Curves in Distant Galaxies Interstellar dust grains significantly impact the formation of new stars and the appearance and derived stellar populations of distant galaxies. Dust grain properties, including composition, size, and structure, reflect both the dust progenitors and subsequent interstellar processing. Variations in dust grain properties lead to wavelength-dependent differences in the UV-to-MIR extinction curves of galaxies. Studies of distant galaxies commonly assume extinction curves similar to the Milky Way, Local Group, and starburst galaxies; this assumption has not been confirmed in normal galaxies. Recent studies using quasar absorption systems (QASs) find that there may be more small grains, silicate dust grains may be larger or have more crystallinity, and that there may be differences in the relative build-up of carbonaceous and silicate dust grain populations. However, such UV-to-MIR analyses have only been possible for a small number of sources. We propose to obtain STIS G230L/G430L spectra to determine the shape of the UV extinction curve and strength of the 2175 A bump produced by carbonaceous dust in a sample of 6 QASs with JWST MIRI-MRS and optical data. The proposed data will allow us to break the fitting-degeneracy between the FUV-rise and 2175 A bump, to determine whether these galaxies have a large population of carbonaceous grains or a large population of small grains relative to the Milky Way. It will also allow a comparison of the UV features from carbonaceous grains with MIR silicate features in the same sightline of z>0.1 galaxies. These results may impact corrections applied to high-z galaxy studies, as well as models for the formation/evolution of dust grains. We will obtain HST STIS G230L-MAMA and G430L-CCD spectra spanning 1570-5700 Angstroms in the observed frame for 6 quasar absorption systems that have JWST MIRI-MRS Cycle 1-3 data covering the 10 micron silicate dust absorption feature. These new data will be utilized to fit the shape and strength of the 2175 Angstrom bump produced by carbonaceous dust, and to break the 2175 Angstrom bump-FUV rise fitting degeneracy. All of the selected sources have archival spectral data at redder optical wavelengths, as well as in the FUV for some of the sources, but lacked spectra fully covering the absorber-frame NUV spectrum. To detemine our spectral exposure times for the observations, we utilized ETC 33.2 with a 52"x0.2" slit assuming a point source. We selected the 52"x0.2" slit in order to simultaneously maximize the resolution and throughput, and to retain sufficient spectral purity to measure any metal ion aborption lines detected in the spectra. For observations with the G230L grating and MAMA detector, we used the unbinned QSO-FOS (100-3387 Angstrom at z=0) template, shifted to the QSO redshift. We normalized the QSO spectrum using the NUV-GALEX magnitude with measured Galactic reddening, using the Av available from NED. We determined the number of exposures required to reach a SNR/resel (signal-to-noise ratio per resolution-element) of at least 10 at the location of the 2175 Angstrom bump center or greater than 9 at 2600 Angstroms. For the G430L observations, we used the unbinned QSO-LBQS (800-6000 Angstrom at z=0) spectrum at the QSO redshift normalized by the NUV-GALEX, g-SDSS, and SIMBAD V-band magnitudes with measured Galactic reddening. We determined the number of exposures required to reach a SNR/resel of at least 10 at 3200 Angstroms. To mitigate the effects of CTI losses and non-uniform dark currents, we utilize the 52x0.2E1 pseudo-aperture for the CCD observations, which places our target closer to the readout amplifier. We also restrict the G430L-CCD observations to < 1000s to minimize cosmic ray (CR) build-up. These SNRs are consistent with several previous STIS QAS studies, and based on analyses of archival data, this SNR is required to break the degeneracy between the strength of the 2175 Angstrom feature and the FUV rise. Our STIS spectra will be combined with archival spectra to maximize wavelength coverage of the extinction curve. For each grating we obtain multiple exposures at dithered positions along the STIS slit to minimize the effects of hot pixels and cosmic rays. Exposures have been grouped into visits of 1-3 orbits, consisent with the current gyro restrictions, and the G230L and G430L are placed into separate visits for scheduling flexibility. We dither by step sizes exceeding the standard extraction apertures, using integer pixel steps, to mitigate the effects of the hot pixels. For G430L observations consisting of a single orbit for the source, we obtain 3 exposures with a single exposure (CRSPLIT=1) at each location in a 3-point dither pattern with step sizes of 0.5" (10 pixels). For observations with 4 total orbits, we obtain 3 exposures per position (i.e., a CRSPLIT of 3) and dither between orbits with 2 step dither patterns of 0.5" and 1.0". For the G230L science exposures, we obtain 2 dithered exposures per orbit for all sources, with pixel step sizes ranging from 0.3-0.5". For objects with 4-5 orbits, allowing for more exposures per visit, we center the dither patterns around the source. For the NUV-MAMA observations, we utilize the TIME-TAG mode recommended by the STIS instrument handbook for sources with <20,000 ct/s. We confirmed with the STIS ETC that all targets are well-below the maximum global count rate for the MAMA detector, and that there are no sources with safetly violations identified by the APT-BOT. For target acquisitions, we utilize the recommended F28X50LP filter. We designed our target acquistions to detect the source with a SNR of at least 40, even if the target is 1.5 magnitudes fainter than the published magnitudes. This will account for possible source variability, which can be as large as a factor of 4 in flux for some sources at some frequencies. We have also confirmed that if the source is 1.5 magnitudes brighter than the catalogued magnitudes, we would be well below the saturation limit for the CCD detector. To determine the exposure times, we utilized ETC Version 33.2, assuming a point source with the QSO SDSS template (covering 800-8554 Angstroms at z=0). This template was redshifted to the QSO redshift (0.4<zQSO<1.5 for sample targets) and corrected for Galactic redenning using values from NED. For each source (where available) we normalized the spectrum using the SDSS r-band magnitude from SIMBAD. If the sources match the published magnitudes at the time of observation, we will achieve a SNR of 89-108 for each target. We have confirmed via NED and SIMBAD that there are no catalogued brighter targets within 5" of each source, which could lead to incorrect source identifications. Since we utilize the 52"x0.2" slit, we use a target acqusition (ACQ), but we do not additionally include an ACQ/PEAK. PI Monique C. Aller (Associate Professor, Georgia Southern University): Dr. Aller has expertise in connections between the dust and gas in the interstellar and circumgalactic medium, quasar absorption systems, galaxy structure and evolution, and supermassive black holes. She has significant experience in working with the signatures of silicate and carbonaceous dust grains in quasar absorption systems at z<1.5. Dr. Aller has first-authored several published papers investigating silicate dust absorption in gas-rich quasar absorption systems, including a paper finding indicators of possible crystallinity in the z=0.9 absorber toward PKS 1830-211 (Aller et al. 2012). She was the co-I (and science-PI for one) of 3 NASA-ADAP programs exploring silicate and carbonaceous dust signatures in quasar absorption systems, and their connection with the gaseous properties of these systems, such as their depletions and metallicity, using archival space-based data. Dr. Aller was the PI of a Cycle 25 HST GO program using STIS G230L/G430L spectra to determine the 2175 Angstrom bump and extinction curve shape in a z=0.4 DLA toward 3C 196 in comparison with the detected silicate dust absorption in this source. Dr. Aller is also leading a Cycle 1 JWST program investigating the silicate dust grain properties, and ice features in the QAS PKS 1830-211, and is the co-I of three ongoing JWST programs (Cycles 1 & 3) investigating silicate dust, carbonaceous dust, and ice features in the diffuse and dense ISMs using MIRI-MRS spectra for QASs. Dr. Aller will lead the proposed program, including planning the analysis, interpretation, and publication of the proposed STIS data. Co-I Varsha Kulkarni (Professor, University of South Carolina): Dr. Kulkarni is an expert in the fields of quasar absorption-line spectroscopy, circumgalactic medium (CGM), and dust in distant galaxies. She has successfully led and completed several HST, Spitzer, and Herschel programs related to the CGM and quasar absorption systems, and was a postdoc with the NICMOS science team at the Univ. of Arizona. She and her collaborators have published a number of papers making use of these programs that used instruments such as HST STIS, COS, NICMOS, WFC3, and Spitzer IRS. She led the first detection of silicate dust in quasar absorption systems and the first mini-survey of silicate dust in other quasar absorbers with Spitzer IRS. This included the analysis of quasar mid-IR spectra for measurement of silicate features in several quasar absorbers. She is currently leading a cycle 1 JWST program and two cycle 3 JWST proposals investigating dust in QASs, and has led multiple ADAP programs investigating dust in distant galaxies, including a current program focused on extinction curves in QASs probed with archival data. Dr. Kulkarni will be assisting with the reduction and analysis of these data, as well as interpreting the shape of the extinction curves in the context of other sources. Co-I Viacheslav Klimenkov (Postdoctoral Researcher, University of South Carolina): Dr. Klimenko is an expert in the fields of CGM and ISM. He has extensive experience in the spectroscopic analysis of atomic and molecular phases of the CGM and ISM to determine physical conditions, as well as chemical composition. He has been instrumental in reducing and analyzing the JWST MIRI-MRS data and determining the shape of the extinction curves (including the FUV rise) and strength of the 2175 Angstrom feature (Klimenko, Kulkarni, & Aller, ApJ submitted-2 papers), as part of JWST program 2155, and will be analyzing the data for JWST programs 5491 and 6350, which we will be using to assess the silicate grain properties for targets also in this proposal. He will play an important role in the production and analysis of the extinction curves for this program. Stellar Populations and the Interstellar Medium Intergalactic Medium and the Circumgalactic Medium 6 false true false false false false false SUPPORTED GALAXY QSO NO This object was generated by the targetselector and retrieved from the NED database. Coordinates and proper motion updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with uncertainty based on difference with estimated V-magnitude from SDSS observations. J2000 J2000 g=19.2; NUV GALEX=20.8 GALAXY QSO NO This object was generated by the targetselector and retrieved from the NED database. Coordinates and proper motion updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with uncertainty based on difference with estimated V-magnitude from SDSS observations. J2000 J2000 g=19.1, NUV GALEX = 20.8 GALAXY QSO NO This object was generated by the targetselector and retrieved from the NED database. Coordinates updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with uncertainty based on difference with estimated V-magnitude from SDSS observations. J2000 J2000 g=16.9, GALEX NUV=16.9 GALAXY BL LAC QUASAR NO This object was generated by the targetselector and retrieved from the NED database. Coordinates updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with uncertainty based on difference with estimated V-magnitude from SDSS observations. J2000 J2000 g=16.7, GALEX NUV =17.1 GALAXY QUASAR NO This object was generated by the targetselector and retrieved from the NED database. Coordinates updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with uncertainty based on difference with estimated V-magnitude from SDSS observations. J2000 J2000 g=18.1, GALEX NUV =20.2 GALAXY QSO NO This object was generated by the targetselector and retrieved from the NED database. Coordinates updated to match SIMBAD. The redshift was taken from NED. V-magnitude from SIMBAD with assumed 0.2 uncertainty, similar to other targets. J2000 J2000 GALEX NUV=16.9 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 POS-TARG DITHER 0.5 LINE false false 3 90.0 STIS-ALONG-SLIT 1 false POS-TARG DITHER 0.5 LINE false false 2 90.0 STIS-ALONG-SLIT 2 false POS-TARG DITHER 1.0 LINE false false 2 90.0 STIS-ALONG-SLIT 3 false POS-TARG DITHER 0.5 LINE false false 2 90.0 STIS-ALONG-SLIT 4 false POS-TARG DITHER 0.3 LINE false true 4 90.0 STIS-ALONG-SLIT 5 false POS-TARG DITHER 0.3 LINE false true 6 90.0 STIS-ALONG-SLIT 6 false POS-TARG DITHER 0.4 LINE false true 4 90.0 STIS-ALONG-SLIT 7 false The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "01" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 13:57:20.0" :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 74032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 380 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) true 1 0 Calculated using V-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "02" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 14:03:26.0" :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 74032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2594 :al-overhead-at-end 0 :internal-dur-at-end 380 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) true 1 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnitudes fainter than catalogued to account for variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "03" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 14:05:12.0" :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 74032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2605 :al-overhead-at-end 0 :internal-dur-at-end 380 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 1 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "04" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 14:06:41.0" :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 74032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2605 :al-overhead-at-end 0 :internal-dur-at-end 380 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 1 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. /System/Volumes/Data/solaris/user1/weck/work/OP-cache/18036-v05.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "05" :proposal-version -1 :trans-version "20250929" :date "28-Jan-2026 13:26:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 147648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "05" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2523 :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 2905 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "05" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2525 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) false 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. /System/Volumes/Data/solaris/user1/weck/work/OP-cache/18036-v06.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "06" :proposal-version -1 :trans-version "20250929" :date "28-Jan-2026 13:26:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 147648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "06" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2523 :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 2905 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "06" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2525 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) false 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "07" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 14:12:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 147648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "07" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2599 :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 2979 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "07" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "08" :proposal-version -1 :trans-version "20250624" :date "05-Aug-2025 14:13:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 147648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "08" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2599 :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 2979 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "08" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "09" :proposal-version -1 :trans-version "20250624" :date "08-Aug-2025 12:30:47.0" :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 296080 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "09" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) true 1 0 Calculated using V-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "10" :proposal-version -1 :trans-version "20250624" :date "12-Aug-2025 12:59:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 591744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "10" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2595 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "10" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2596 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) true 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "08-Aug-2025 13:19:49.0" :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 296080 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "11" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 1 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "12" :proposal-version -1 :trans-version "20250624" :date "08-Aug-2025 13:20:07.0" :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 296080 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "12" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 1 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. /System/Volumes/Data/solaris/user1/weck/work/OP-cache/18036-v13.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "13" :proposal-version -1 :trans-version "20250929" :date "28-Jan-2026 13:26:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 591744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "13" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2525 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "13" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2524 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) false 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. /System/Volumes/Data/solaris/user1/weck/work/OP-cache/18036-v14.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "14" :proposal-version -1 :trans-version "20250929" :date "28-Jan-2026 13:25:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 887408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "14" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2525 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "14" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2524 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "14" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2524 :al-overhead-at-end 0 :internal-dur-at-end 582 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2905 :pcs-gap 0 ) false 3 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "15" :proposal-version -1 :trans-version "20250624" :date "12-Aug-2025 13:01:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 591744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "15" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2599 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "15" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18036 :visit-id "16" :proposal-version -1 :trans-version "20250624" :date "12-Aug-2025 13:01:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 591744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18036 :visit-id "16" :obset-id "16" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18036 :visit-id "16" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2599 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18036 :visit-id "16" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 2 0 Calculated using SDSS r-band magnitude, assuming it could be 1.5 magnirudes fainter than catalogued to account for possible variability.