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. POS TARG OUTSIDE OF APERTURE ORBITAL VISIBILITY OVERRUN POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE 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 ACQ/PEAKD exposure should be preceded by an ACQ/PEAKXD exposure in the Visit. POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE ORBITAL VISIBILITY OVERRUN 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 ACQ/PEAKXD exposure should be followed by an ACQ/PEAKD exposure in the Visit. 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. All ORIENTS and windows are placeholders for now. ORIENTSs and offset coordinate positions will need to be refined before each visit. These updates will require a Phase II resubmission before each visit executes. The orbital overrun for v04, the verification visit, is expected right now. Default positions for G140L ACQs and spectra are still at other LP positions, so overheads are very large for the switching. The orbit length was tested with LP=11 explicitly for all observations and overheads are much smaller and visit fits within an orbit. ------- Submission v02 - March 17, 2026 Updated ORIENTS of visits 01-03, changed LIFETIME-POS explictly to LP11 in v04, and made minor updates to comment boxes throughout. ------- Submission v03 - May 1, 2026 Updated windows and ORIENTS for all visits with revised expectations. ------- Submission v04 - July 26, 2026 Reordered visit windows so that v03 goes first. Windows and orients for v01, 02, and 04 were adjusted accordingly. Renamed some of the offset target labels with "VISIT1" to correctly reflect the visit numbers they are used in. Updated the coordinate offsets for targets 4 and 6 to use ORIENT=301.5deg. ------- Submission v05 - Sept. 29, 2026 Prepared visits 01 and 02 for execution during October window. Offsets computed and entered for targets 2, 3, and 5 using ORIENT = 3.5 deg (to avoid FGS2). Noted that with new version of APT there is now a 4s overrun on each orbit. 13637488 ----- Attempting Submission 1 (Sat Mar 07 21:39:05 GMT 2026) ----- ----- Attempting Submission 2 (Tue Mar 17 20:50:36 GMT 2026) ----- ----- Attempting Submission 3 (Fri May 01 17:33:52 GMT 2026) ----- ----- Attempting Submission 4 (Sun Jul 26 22:40:24 GMT 2026) ----- ----- Attempting Submission 5 (Wed Sep 30 00:48:57 GMT 2026) ----- All warnings are expected for the postarg positions. The FP-POS has to be the same for this enabling program. The orbital overrun for v04 is expected right now. Default positions for G140L ACQs and spectra are still at other LP positions, so overheads are very large for the switching. The orbit length was tested with LP=11 explicitly for all observations and overheads are much smaller and visit fits within an orbit. This program is designed to verify acquisition parameters at LP11 and to produce spectra at several regions on the detector that would normally be used for target acquisition, but for which data are not downlinked as part of the acquisition process. The idea is that if anything does go wrong with the acquisition tests we will have detailed spectra that we can then use for diagnostics. The program uses ficticious offset targets to nod the telescope away from a centered target and then test the re-acquisition. Because these displacements need to happen along the AD and XD detector direction and target offset coordinates must be entered in RA and DEC, the ORIENT angle for each visit must be restricted to +/- 0.5 degrees, which also means a date range restriction. The date ranges and ORIENT restrictions for each visit are described in the program description. The program is modeled after the LP4/5/6/7/10 versions of this program: 16432, 16851, 17246, 17886, and 18183. The target that will be used for enabling is WDG-1 for cenwave G140L/1280 at LP11. The target that will be used for verification at the start of Cycle 34 is also WDG-1. Due to RGM, visibility windows around the Cycle 34 start date (2026 Nov 1) are: 2026 Oct 19-30 2026 Dec 7-17 Prior to the execution of this program all final LP11 SIAF, aperture mechanism positions, TA subarray, and foci must have been installed. To ensure this, LP11 enabling programs 18231 and 18232 need to be completed and analyzed before execution of this program. There is no special commanding in this program. Please see special request at the bottom of the proposal description. Those requests still apply here. This program is structured after the LP4/5/6/7/10 TA enabling programs 16432, 16851, 17246, 17886, and 18183. All LP11 exposures use cenwave G140L/1280. The general structure of each visit follows the following steps (visits 01-03): 1- Acquire the target using NUV ACQ/IMAGE. It is assumed that NUV ACQ/IMAGE acquisitions are correctly centered because ACQ/IMAGE is routinely monitored for accuracy. 2 - Take a high SN spectrum to use as a baseline comparison after ACQ/IMAGE 3 - Use POSTARG to offset the telescope to the positions where the acquisition sequence (SEARCH, PEAKD, or PEAKXD) will take exposures and take a spectrum at each position. 4 - Run the acquisition sequence that was simulated in step 3 on the centered target. 5 - Take a spectrum to verify the centering done on step 4. Verification is done by comparing this spectrum to the one taken on step 2. 6 - Offset the telescope using a virtual target, and run the relevant acquisition. This step tests that the telescope can actually perform an acquisition and center an offset target. This step is repeated for a few different offsets, depending on the acquisition mode being tested. See visit level comments for details. 7 - Take a spectrum after the acquisition to verify centering. We specify the exposures so that a signal-to-noise ~10-15 per resel will be obtained at 1410 A. The signal-to-noise varies over the spectral range of G140L/1280, with a S/N of up to ~5 at 1100A, and ~5-7 from 1600-1800A. The signal-to-noise for WDG-1 will be a factor of ~2 higher than compared to previous LP4 target AV-18 for this setup. Visit 04 uses the parameters as default. The visit level exposures describe the defaults and/or recommended parameters in each case, as per Chapter 8 of the COS IHB. Each visit should be spaced at least 6 weeks after the previous one to allow time for analysis and modification of the next visit, if necessary. The following windows are tentative and will depend on the progress of the other enabling programs. NOTE: The offsets used for the targets are ORIENT dependent and need to be updated/verified before every visit, along with the ORIENT update before execution. Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=224 - Later half of window is no longer tentative for v01 July 11 2026 to Aug 4 2026 ORIENT=276 Aug 29 2026 to Sept 15 2026 ORIENT=301 - New Tentative for v03 Oct 19 2026 to Oct 30 2026 ORIENT=3 - New Tentative for v01 Dec 7 2026 to Dec 18 2026 ORIENT=49 - New Tentative for v02 Jan 24 2026 to Feb 5 2027 ORIENT=100 - New Tentative for v04 NOTE: Visit 03 was moved forward ahead of visits 01 and 02 to provide spectral observations below the nominal aperture position in the detector area with possible grid wire shadow. Visit 04 - Defaults verification. First SMS for which LP11 becomes the default for G140L, either last week of October 2026 ORIENT=3 or 2026 December 7-17 window ORIENT=49 (ORIENTS will be finalized later). Visit 04 repeats the tests using Cycle 34 values, as opposed to specifying them explicitly (except for LIFETIME-POS, which now requires specification). This is to verify that the defaults are working properly. This visit should be run on the first day or so of Cycle 34. The precise timing should be revised when the SMS schedule is known. No FUV acquisitions at LP11 should be scheduled until the results of this visit are verified. The exposures are described in more detail at the visit level comments. No special commanding is needed for this program. ----SUMMARY OF RECOMMENDED FUV ACQUISITION PARAMETERS, FROM IHB, CHAPTER 8 -------------- ACQ/SEARCH SCAN-SIZE should be picked to match uncertainty, as per IHB Table 8.2. We test 2 and 3. Default STEP-SIZE is 1.767 always CENTER=FLUX-WT for SCAN-SIZE=2 and CENTER=FLUX-WT-FLR for SCAN-SIZE >2 ACQ/PEAKXD Default is NUM-POS=3, CENTER=FLUX-WT, STEP-SIZE=1.3 If using NUM-POS=5 then CENTER=FLUX-WT-FLR, STEP-SIZE=0.9 ACQ/PEAKD Default is NUM-POS=5, CENTER=FLUX-WT-FLR, STEP-SIZE=0.9 If using NUM-POS=3 then CENTER=FLUX-WT, STEP-SIZE=1.3 ---------------------------------------------------------------------------------------- ----SPECIAL REQUESTS:----- The following requests still apply even for the visit that tests default values. (1) Please turn off calibration for the COS/FUV exposures. These data should not be used for scientific purposes. (2) Please disassociate all exposures. All data that are not calibrated must be disassociated to make it into the archive. SQL is used to meet the above requests. In (1), qexposure.control_id is modified. In (2), qeassociation records are deleted. Contact A. McCormick, M. Harr, M. Reinhart, and the distribution list HST_SOC_SE_Team@stsci.edu for further information about this process. (3) Please avoid the use of FGS2 when possible. -------------------------- 0 false false false RESTRICTED CALIBRATION TARGET ACQUISITION TEST NO This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. J2000 J2000 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=227 (current offsets above apply 227) July 11 2026 to Aug 4 2026 ORIENT=270 Aug 29 2026 to Sept 15 2026 ORIENT=317 Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 18 2026 ORIENT=49 Jan 24 2027 to Feb 5 2027 ORIENT=100 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for approximate Cycle 34 start Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 16 2026 ORIENT=49 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=227 (current offsets above apply 227) July 11 2026 to Aug 4 2026 ORIENT=270 Aug 29 2026 to Sept 15 2026 ORIENT=317 Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 18 2026 ORIENT=49 Jan 24 2027 to Feb 5 2027 ORIENT=100 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Current offsets above apply ORIENT=301.5 Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=227 July 11 2026 to Aug 4 2026 ORIENT=270 Aug 29 2026 to Sept 15 2026 ORIENT=317 Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 18 2026 ORIENT=49 Jan 24 2027 to Feb 5 2027 ORIENT=100 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=227 (current offsets above apply 227) July 11 2026 to Aug 4 2026 ORIENT=270 Aug 29 2026 to Sept 15 2026 ORIENT=317 Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 18 2026 ORIENT=49 Jan 24 2027 to Feb 5 2027 ORIENT=100 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Current offsets above apply ORIENT=301.5 Possible dates and orients for Cycle 33 Apr 21 2026 to May 6 2026 ORIENT=190 May 29 2026 to June 20 2026 ORIENT=227 July 11 2026 to Aug 4 2026 ORIENT=270 Aug 29 2026 to Sept 15 2026 ORIENT=317 Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 18 2026 ORIENT=49 Jan 24 2027 to Feb 5 2027 ORIENT=100 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for approximate Cycle 34 start Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 16 2026 ORIENT=49 CALIBRATION TARGET ACQUISITION TEST NO From the geometry of COS, going from offsets in AD and XD to offsets in ra and dec: Delta(dec) = Delta(AD)*cos(ORIENT - 45) + Delta(XD)*cos(ORIENT - 135) will yield the result in arcseconds, which is what APT wants. Delta(RA) = ( Delta(AD)*sin(ORIENT - 45) + Delta(XD)*sin(ORIENT - 135))/(3600. * cos(dec)) will yield the result in decimal degrees of RA, which is what APT wants. Possible dates and orients for approximate Cycle 34 start Oct 19 2026 to Oct 30 2026 ORIENT=3 Dec 7 2026 to Dec 16 2026 ORIENT=49 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G160M 1577 1790714017346 The scheduling data was generated by CASM 34.2. CASM was run in Phase II mode. /private/var/folders/_b/k1329bs53yg68lrswlm3cqwm0001dl/T/OPVisit11059500632488750098.xml The BETWEEN for this visit is TBD, after other enabling programs are first completed. This visit likely won't execute until June 2026. The ORIENT angle is TBD. The offsets used for the targets are ORIENT dependent and need to be updated/verified, along with the ORIENT update before execution. The sequence of events is: 01.001 - NUV Acquisition 01.002 - centered baseline spectrum after NUV acquisition 01.003 through 01.010 - taking spectra to examine the 3x3 grid used in a 3x3 FUV acq/search - see note below about exposure times and buffer times 01.011 - perform 3x3 ACQ/SEARCH 01.012 - verification spectrum 01.013 - 3x3 ACQ/SEARCH on an offset target 01.014 - verification spectrum 01.015 - 2x2 ACQ/SEARCH on a centered target 01.016 - verification spectrum For exposures 2 through 10: For the 3x3 offset pattern used to simulate ACQ/SEARCH, we use the same timing scheme that was used at LP6 (16851) and LP7/10 (17886). Throughput at a side position (e.g., 0.0, 1.1) is ~58%. Throughout at a corner position (1.1, 1.1) is ~28.6%. We would like the sides and the corners to have the same count rate. However, we would like to have a high SN spectrum for verifying position, so make the center 25s because that's what fits in the orbit. Buffer times are also increased to account for the vignetted flux. Here we do not use the default STEP-SIZE=1.767 because doing so would not provide enough flux. Using a smaller STEP-SIZE illuminates the same regions of the detector, but with more light. SCAN-SIZE should be picked to match uncertainty, as per IHB Table 8.2. We test 2 and 3. Default STEP-SIZE is 1.767 always CENTER=FLUX-WT for SCAN-SIZE=2 and CENTER=FLUX-WT-FLR for SCAN-SIZE >2 (Tic-Visit :proposal-id 18233 :visit-id "01" :proposal-version -1 :trans-version "20260828" :date "29-Sep-2026 16:33:37.0" :trans-errors '(:WARNINGS 5 :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 122400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18233 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18233 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2745 :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 3121 :pcs-gap 0 ) true 1 1 ACQ/IMAGE to determine center. Used Castelli-Kurucz Models B0I 26000 normalized to V=11.84 because the exisiting spectrum does not cover the entire NUV range. Note: Pickles model was used last cycle, suggesting exptime=23 second. There was a partial overlap between instrument throughput band and target spectrum. A few seconds could be shaved from the exptime, if needed for other exposures. Take spectrum after ACQ/IMAGE centering to establish center position. Used abutted ULLYSES spectrum (FUSE + COS G130M/G160M) for the ETC. Exposure time of 25 seconds gives SNR=14 at 1410A. See visit level note about exposures 01.002 through 01.010. (1.1, 0.0) POSTARG TO SIMULATE ACQ/SEARCH. At 1.1,0 throughput is ~58%. BUFFER-TIME is adjusted from 01.002 to take into account the decreased throughput. 250/0.58 = 430, applying 350 to be conservative. See visit level note about exposures 01.002 through 01.010. S/N will be lower than baseline spectrum to fit within one orbit. (1.1, 1.1) POSTARG TO SIMULATE ACQ/SEARCH. At 1.1, 1.1 (corner) throughput is ~28.6% BUFFER-TIME is adjusted from 01.002 to take into account the decreased throughput. 250/0.286 = 874, applying 730 to be conservative See visit level note about exposures 01.002 through 01.010. S/N will be lower than baseline spectrum to fit within one orbit. (0, 1.1) POSTARG TO SIMULATE ACQ/SEARCH this is a side, so see exposure 01.003 for comments See visit level note about exposures 01.002 through 01.010. (-1.1, 1.1) POSTARG TO SIMULATE ACQ/SEARCH this is a corner, so see exposure 01.004 for comments. See visit level note about exposures 01.002 through 01.010. POSTARG TO SIMULATE ACQ/SEARCH this is a side, so see exposure 01.003 for comments. See visit level note about exposures 01.002 through 01.010. POSTARG TO SIMULATE ACQ/SEARCH this is a corner, so see exposure 01.004 for comments. See visit level note about exposures 01.002 through 01.010. POSTARG TO SIMULATE ACQ/SEARCH this is a side, so see exposure 01.003 for comments. See visit level note about exposures 01.002 through 01.010. POSTARG TO SIMULATE ACQ/SEARCH this is a corner, so see exposure 01.004 for comments. See visit level note about exposures 01.002 through 01.010. This actually performs the ACQ/SEARCH that was mapped in exposures 01.003 to 01.010. For this reason it is not using the default STEP-SIZE of 1.76". See visit level comment on exposures 01.002 to 01.010 Requested Signal/Noise Ratio = 40.000 for Segment A and Segment B combined gives: Time = 0.5994 seconds Time Required for Requested SNR in Segment A only: 0.5994 This exposure is identical to 01.002. The result should be identical as well. Same as 01.011, but now it starts on an offset position with a virtual target at +1AD, +1XD. Note also that this one uses the default STEP-SIZE. Functionally the same as 01.012 and 01.002, but after centering from an offset position. 2x2x1.767" ACQ/SEARCH, default settings explicitly selected. Starting from target offset by -1AD, -1XD. To verify the ACQ/SEARCH results. Identical to 01.002 1790714032117 The scheduling data was generated by CASM 34.2. CASM was run in Phase II mode. /private/var/folders/_b/k1329bs53yg68lrswlm3cqwm0001dl/T/OPVisit5469434148241637082.xml *********** The BETWEEN for this visit is TBD, after other enabling programs are first completed. The offsets used for the targets are ORIENT dependent and need to be updated/verified, along with the ORIENT update before execution. The ORIENT angle is TBD. Any ORIENT is possible, but if the ORIENT changes then the PI will have to change the offsets for the virtual targets (not hard to do). *********** First we perform an ACQ/IMAGE and take a G140L/1280 high SN spectrum and use it as the baseline for comparing the position of the other spectra. We then perform an actual 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKD on the centered target and take a spectrum. The position of this spectrum should be centered to the same specifications as the flux weighted centroiding in the previous step. We simulate a 5x0.8" ACQ/PEAKD taking short spectra. We start with the centered (0) position then go to -1.6" in X and proceed in steps of 0.8" out to +1.6" X. The flux weighted centroid of all 5 exposures should provide the same result as the acquisition. We then use virtual targets to perform 5x0.9" ACQ/PEAKD starting from offsets of -0.7" and +0.7". We then repeat the process for a 3x1.3 ACQ/PEAKD for offsets of -0.3" and +0.3". Default is NUM-POS=5, CENTER=FLUX-WT-FLR, STEP-SIZE=0.9 If using NUM-POS=3 then CENTER=FLUX-WT, STEP-SIZE=1.3 In this visit we take a 25s exposure to be the baseline value for the POSTARG observations. ETC calculation COS.sp.2281679. We scale exptimes for the POSTARG'd spectra by the expected throughput (which is a function of radius), as implemented in previous iterations of this program. Note that recent analyses indicate throughput loss may actually be larger for 1.6" offsets than stated below. OFFSET %LOSS ET equivalent/second ET 0.00 0.00 1.00 25s 0.80 20.00 1.25 31s 1.60 73.33 3.75 94s (Tic-Visit :proposal-id 18233 :visit-id "02" :proposal-version -1 :trans-version "20260828" :date "29-Sep-2026 16:33:51.0" :trans-errors '(:WARNINGS 3 :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 191872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18233 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18233 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2745 :al-overhead-at-end 0 :internal-dur-at-end 357 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3121 :pcs-gap 0 ) true 1 1 ACQ/IMAGE to determine center. Used Castelli-Kurucz Models B0I 26000 normalized to V=11.84 because the exisiting spectrum does not cover the entire NUV range. Note: Pickles model was used last cycle, suggesting exptime=23 second. There was a partial overlap between instrument throughput band and target spectrum. A few seconds could be shaved from the exptime, if needed for other exposures. Spectrum to determine location after ACQ/IMAGE centering. Need high SN for determining position of other spectra. ACQ/PEAKD of a centered target on the same 5x0.8"" pattern. This ACQ/PEAKD goes through the same positions that exposures 02.005 through 02.008 do. The flux weighted centroid of those exposures should yield the same center as this PEAKD. Here we do not use the default STEP-SIZE because we would like to replicate the mapping done in exposures 02.005 to 02.008. Using STEP-SIZE=0.9 there would have yielded too low a flux for analysis. Spectrum to determine location after ACQ/PEAKD. POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKD. This is the x= -1.6 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=-1.6" is assumed 73%: 25s / (1-0.73)=94s. Buffer-time: 250/(1-0.73) = 925.9, applying 750 to be conservative. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8" POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKD. This is the x= -0.8 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=-0.8" is 20%: 25s/(1-0.20)=31s. Buffer-time: 250/(1- 0.20) = 312.5, applying 265 to be conservative. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8" POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKD. This is the x= +0.8 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=+0.8" is 20%: 25s/(1-0.20)=31s. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8". POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKD. This is the x= +1.6 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=+1.6" is 73%: 25s / (1-0.73)=94s. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8". 5x0.9" ACQ/PEAKD on an off centered target. The virtual target is defined as being at a +0.7" offset from the real target. So at the beginning of acquisition the real target is offset -0.7" from the center of the field of view. Spectrum to determine location after ACQ/PEAKD. This exposure is identical to 02.002, except the telescope thinks that it's at an off-center target. But really it centered on the real target. 5x0.9" ACQ/PEAKD on an off centered target. From the previous acquisition, the telescope thinks it's at +0.7AD from the real target, but the real target is actually centered in the field of view. Now we ask the telescope to go back to the coordinates of the real target. That moves the telescope -0.7"AD. So now the real target is at +0.7"AD. Spectrum to determine location after ACQ/PEAKD. This exposure is identical to 02.002 3x1.3" ACQ/PEAKD on an off centered target. From the previous acquisition, the telescope is centered on the real target and also thinks that it is centered on the real target. We now command the telescope to move to a virtual target at +0.3"AD from the real target. That places the real target at -0.4"AD in the field of view. Spectrum to determine location after ACQ/PEAKD. It's actually centered on the real target. 3x1.3" ACQ/PEAKD on an off centered target. From the previous acquisition, the telescope thinks it's at +0.3AD from the real target, but the real target is actually centered in the field of view. Now we ask the telescope to go back to the coordinates of the real target. That moves the telescope -0.3"AD. So now the real target is at +0.4"AD. Spectrum to determine location after ACQ/PEAKD. This exposure is identical to 02.002 1785105206896 The scheduling data was generated by CASM 34.2. CASM was run in Phase II mode. *********** The BETWEEN for this visit is TBD, after other enabling programs are first completed. The offsets used for the targets are ORIENT dependent and need to be updated/verified, along with the ORIENT update before execution. The ORIENT angle is TBD. Any ORIENT is possible, but if the ORIENT changes then the PI will have to change the offsets for the virtual targets (not hard to do). *********** This visit tests PEAKXD. It is a copy of visit 02, PEAKD test, with X and Y displacements inverted. The process is entirely symmetrical. First we perform an ACQ/IMAGE and take a G140L/1280 high SN spectrum and use it as the baseline for comparing the position of the other spectra. We then perform an actual 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKXD on the centered target and take a spectrum. The position of this spectrum should be centered to the same specifications as the flux weighted centroiding in the previous step. We simulate a 5x0.8" ACQ/PEAXKD taking short spectra. We start with the centered (0) position then go to -1.6" in Y and proceed in steps of 0.8" out to +1.6" Y. The flux weighted centroid of all 5 exposures should provide the same result as the acquisition. We then use virtual targets to perform 5x0.9" ACQ/PEAKXD starting from offsets of -0.7" XD and +0.7" XD. We then repeat the process for a 3x1.3 ACQ/PEAKXD for offsets of -0.3" XD and +0.3" XD. Default is NUM-POS=3, CENTER=FLUX-WT, STEP-SIZE=1.3 If using NUM-POS=5 then CENTER=FLUX-WT-FLR, STEP-SIZE=0.9 We scale exptimes for the POSTARG'd spectra by the expected throughput (which is a function of radius), as implemented in previous iterations of this program. Note that recent analyses indicate throughput loss may actually be larger for 1.6" offsets than stated below. OFFSET %LOSS ET equivalent/second ET 0.00 0.00 1.00 25s 0.80 20.00 1.25 31s 1.60 73.33 3.75 94s 1788335911000 301.189974677134 (Tic-Visit :proposal-id 18233 :visit-id "03" :proposal-version -1 :trans-version "20260618" :date "26-Jul-2026 18:33:26.0" :trans-errors '(:WARNINGS 3 :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 191872 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18233 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18233 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 357 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3121 :pcs-gap 0 ) false 1 1 ACQ/IMAGE to determine center. Used Castelli-Kurucz Models B0I 26000 normalized to V=11.84 because the exisiting spectrum does not cover the entire NUV range. Note: Pickles model was used last cycle, suggesting exptime=23 second. There was a partial overlap between instrument throughput band and target spectrum. A few seconds could be shaved from the exptime, if needed for other exposures. Spectrum to determine location after ACQ/IMAGE centering. Need high SN for determining position of other spectra. ACQ/PEAKXD of a centered target on the same 5x0.8"" pattern. This ACQ/PEAKXD goes through the same positions that exposures 03.005 through 03.008 do. The flux weighted centroid of those exposures should yield the same center as this PEAKXD. Here we do not use the default STEP-SIZE because we would like to replicate the mapping done in exposures 03.005 to 03.008. Using STEP-SIZE=0.9 there would have yielded too low a flux for analysis. Spectrum to determine location after ACQ/PEAKXD. POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKXD. This is the y= -1.6" position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=-1.6" is assumed 73%: 25s / (1-0.73)=94s. Buffer-time: 250/(1-0.73) = 925.9, applying 750 to be conservative. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8" POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKXD. This is the y= -0.8 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=-0.8" is 20%: 25s/(1-0.20)=31s. Buffer-time: 250/(1- 0.20) = 312.5, applying 265 to be conservative. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8" POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKXD. This is the y= +0.8 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=+0.8" is 20%: 25s/(1-0.20)=31s. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8". POSTARG to simulate 5x0.8" (NUM-POS=5, STEP-SIZE=0.8") ACQ/PEAKXD. This is the y= +1.6 " position. If the beam was not vignetted we would reach SNR~10 in a 25s exposure. But throughput loss at x=+1.6" is 73%: 25s / (1-0.73)=94s. While the default STEP-SIZE for NUM-POS=5 is 0.9", that would not allow enough light through for analysis, so we use STEP-SIZE=0.8". 5x0.9" ACQ/PEAKXD on an off centered target. The virtual target is defined as being at a +0.7" offset from the real target. So at the beginning of acquisition the real target is offset -0.7" from the center of the field of view. Spectrum to determine location after ACQ/PEAKD. This exposure is identical to 03.002, except the telescope thinks that it's at an offset position. But really it centered on the real target. 5x0.9" ACQ/PEAKXD on an off centered target. From the previous acquisition, the telescope thinks it's at +0.7XD from the real target, but the real target is actually centered in the field of view. Now we ask the telescope to go back to the coordinates of the real target. That moves the telescope -0.7"XD. So now the real target is at +0.7"XD. Spectrum to determine location after ACQ/PEAKXD. This exposure is identical to 03.002 3x1.3" ACQ/PEAKXD on an off centered target. From the previous acquisition, the telescope is centered on the real target and also thinks that it is centered on the real target. We now command the telescope to move to a virtual target at +0.3"XD from the real target. That places the real target at -0.4"XD in the field of view. Spectrum to determine location after ACQ/PEAKXD. This exposure is identical to 03.002, except the telescope thinks it's offset but it's actually centered on the real target. 3x1.3" ACQ/PEAXKD on an off centered target. From the previous acquisition, the telescope thinks it's at +0.3XD from the real target, but the real target is actually centered in the field of view. Now we ask the telescope to go back to the coordinates of the real target. That moves the telescope -0.3"XD. So now the real target is at +0.3"XD. Spectrum to determine location after ACQ/PEAKXD. This exposure is identical to 03.002 1785105239868 The scheduling data was generated by CASM 34.2. CASM was run in Phase II mode. This visit should run on the first days for which G140L exposures default to LP11. Nominally this is the first day of Cycle 34, but in practice it may depend on the SMS schedule. ORIENT and BETWEEN will need to be updated before this visit can execute. The offsets used for the targets are ORIENT dependent and need to be updated/verified, along with the ORIENT update before execution. It tests that the intended Cycle 34 values are now the defaults. It does an ACQ/IMAGE, ACQ/PEAKXD, and ACQ/PEAKD, all from offset positions. (Tic-Visit :proposal-id 18233 :visit-id "04" :proposal-version -1 :trans-version "20260618" :date "26-Jul-2026 18:33:59.0" :trans-errors '(:WARNINGS 1 :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 139632 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18233 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18233 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2529 :al-overhead-at-end 0 :internal-dur-at-end 357 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2907 :pcs-gap 0 ) false 1 1 ACQ/IMAGE to determine center. Used Castelli-Kurucz Models B0I 26000 normalized to V=11.84 because the exisiting spectrum does not cover the entire NUV range. Note: Pickles model was used last cycle, suggesting exptime=23 second. There was a partial overlap between instrument throughput band and target spectrum. A few seconds could be shaved from the exptime, if needed for other exposures. Spectrum to determine location after ACQ/IMAGE centering. Need high SN for determining position of other spectra. 3x3 FUV ACQ/SEARCH starting at position +1 AD, +1 XD Functionally the same as and 04.002, but after centering from an offset position. Performing a PEAKXD from -0.8" offset in XD. From the previous acquisition, the telescope thinks it's at +1AD, +1XD, but really it's centered on the real target. To place the target at 0.0 AD, -0.8 XD, define a virtual target at +1.0AD, +1.8XD. Functionally the same as and 04.002, but after centering from an offset position. Performing a PEAKD from -0.8" offset in AD. From the previous acquisition, the telescope thinks it's at +1AD, +1.8XD, but really it's centered on the real target. To place the target at -0.8 AD, 0.0 XD, define a virtual target at +1.8AD, +1.8XD. Functionally the same as and 04.002, but after centering from an offset position. Testing 2x2 acq/search with defaults. The telescope thinks it was at +1.8AD, +1.8XD, but really it was centered. Now we command it to go to +1.0AD, +1.0XD, which means that the real target will be offset to -0.8AD, -0.8XD. Functionally the same as and 04.002, but after centering from an offset position. Performing a PEAKXD from -0.8" offset in XD. From the previous acquisition, the telescope thinks it's at +1AD, +1XD, but really it's centered on the real target. To place the target at 0.0 AD, -0.8 XD, define a virtual target at +1.0AD, +1.8XD. Functionally the same as and 04.002, but after centering from an offset position. Performing a PEAKD from -0.8" offset in AD. From the previous acquisition, the telescope thinks it's at +1AD, +1.8XD, but really it's centered on the real target. To place the target at -0.8 AD, 0.0 XD, define a virtual target at +1.8AD, +1.8XD. Functionally the same as and 04.002, but after centering from an offset position. Wavecals are not tested as they are not split.