16228( 11) - 17-Feb-2022 19:02:52 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16228 Version: 11 Check-in Time: 17-Feb-2022 19:02:52 STScI Edit Number: 9 Title A Multi-Cycle Monitoring Program of the Hydra's Shadow ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. John Henry Debes Space Telescope Science Institute - ESA - Y JWST CoI: Dr. Dean C. Hines Space Telescope Science Institute N CoI: Dr. Alycia J. Weinberger Carnegie Institution of Washington N CoI: Dr. Hannah Jang-Condell University of Wyoming N CoI: Dr. Peter Plavchan George Mason University N CoI: Dr. Laurent Pueyo Space Telescope Science Institute N CoI: Dr. Joel H. Kastner Rochester Institute of Technology N CoI: Dr. Schuyler G. Wolff University of Arizona N CoI: Dr. Rebecca Nealon The University of Warwick N CoI: Dr. Richard Alexander University of Leicester N CoI: Prof. Sarah Elaine University of Delaware N Dodson-Robinson ------------------------------------------------------------------------------------ Abstract In the era of HST, JWST, and ALMA, the initial conditions of planet formation will be laid bare through the direct imaging of planet forming regions around nearby young stars. As more and more disks are observed over multiple epochs, their dynamic and variable natures are revealed, opening new avenues of study. Archival HST images of TW Hya's outer disk show that it has a shadow that orbits with a period of ~16 yr, but the full orbit of the shadow has not been observed, leaving ambiguity about its origin. We propose to observe TW Hya over the next three Cycles with HST/STIS coronagraphy to fill in badly needed orbital phase coverage of the shadow's motion and create a homogenous, high quality dataset with archival STIS observations. Our program will elucidate the physical origin of the shadow and constrain the structure of TW Hya's inner cavity independently from sub-mm imaging. Disk shadow imaging is a new tool for understanding the initial conditions of planet formation at radii inaccessible by other observations. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal is replicated from 13753, which observed TW Hya in 2015/2016 with a combination of BAR5 and WEDGEA1.0 50CORON aperture positions. In this program we observe TW HYA in 3 visits interleaved with one visit of the PSF star. The first and last visit of TW Hya is oriented off nominal of between +/-15 to +/-30 degrees to enhance angular coverage of the protoplanetary disk. We seek to have this visit scheduled before August 1, 2021 so as to have phase overlap with a low SNR observation of TW Hya with NICMOS and to fully test the variability of the shadow's amplitude with time. ------------------------------------------------------------------------------------ 16228( 11) - 17-Feb-2022 19:02:52 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 V-TW-HYA STAR, T TAURI STAR RA=11H01M51.9129S +/- 0.125", J2000 V = 10.5 DEC=-34D42'17.00" +/- 0.125" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1999.32 -0.005546789903102758 -0.01402 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 PSF-REF-HD85 STAR, M V-IV RA=09H51M7.7094S +/- 0.125", J2000 V = 7.651 512 DEC=-43D30'17.34" +/- 0.125" Reference Frame: ICRS Extended: NO Comments: possible spoiler star from original 2000 program is now at ~5.73" in 2021. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.04237230684985588 -0.472 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16228( 11) - 17-Feb-2022 19:02:52 - [ 3] Visit: 01 (V1-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100%; ORIENT -30D TO -15D FROM 02 On Hold Comments: Additional Comments: TW Hya First of two sets of visits, each containing three visits of TW Hya at different relative orientations with one PSF calibration observation interleaved. This is the first TW Hya visit in the first set. The four visits within each set must be executed sequentally in contiguous orbits interrupted only for Earth occultation. Orientation: We wish to schedule this visit (1) at -30 deg from Visit 2, with the absolute orientation of Visit 2 unconstrained. We allow a relative orientation tolerence from -15 deg to -30 deg to assist in guide star selection and scheduling. NOTE to PC: Schedule as close to -30 deg from Visit 2 as possible. Relative Timing: This visit (1) should immediately preceed visit (2). I.e., They should be executed sequentially in "back-to-back" orbits. BAR5 exposure times are selected to maximize SNR close to the star (~10-15/pixel up to inner working angle) and WEDGEA1.0 are selected to be as long as possible to ensure depth exterior to 1". Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-TW-HYA STIS/CCD ACQ F28X50LP MIRROR 1 0.2 S (0.2 GS ACQ SCENARIO BASE1B3; S) SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 V-TW-HYA STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 550 S (550 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-TW-HYA STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=3, 1 1425 S GAIN=4 (1425 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-TW-HYA 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 4] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 5] Visit: 02 (V2-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100%; AFTER 01 BY .5 Orbits TO 1.5 Orbits On Hold Comments: Additional Comments: TW Hya three visits of TW HYA at different relative orientations with one PSF calibration observation interleaved. This is the second TW Hya visit in the first set. The four visits within the set must be executed sequentally in contiguous orbits interrupted only for Earth occultation. Orientation: There are no orientation constraints on this visit (2). This visit at nominal roll as scheduled by STScI. Visits 1, 3, 4 carry relative orientation constraints w.r.t. this visit. Relative Timing: This visit (2) should immediately follow Visit 1 and immediately preceed Visit 3 in back-to-back orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-TW-HYA STIS/CCD ACQ F28X50LP MIRROR 1 .2 S (0.2 GS ACQ SCENARIO BASE1B3; S) SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 V-TW-HYA STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 550 S (550 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-TW-HYA STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=3, 1 1425 S GAIN=4 (1425 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-TW-HYA 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 6] Visit: 03 (V3-PSF-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100%; AFTER 02 BY .5 Orbits TO 1.5 Orbits On Hold Comments: Additional Comments: PSF (HD 85512). PSF calibration target for TW Hya. V = 7.636. B - V = +1.15. Spex. K6Vk This is the PSF star calibrator for the flanking visits (1-4). We levy no orientation constraints on this visit (3). However, we choose this target since it has been used in the past for TW Hya. So as Visits 2 and 3 must be scheduled in sequential contiguous orbits, if scheduled at nominal roll (as we expect also Visit 2 will be) then we expect absolute orientations of Visits 2 and 3 to be very similar (within a few degrees). This is important so we maintain similar Sun and Beta angles for the science target and its PSF calibrator, Relative Timing: This visit (3) should immediately follow visit 2 and immediately precede visit 4. I.e., they should be executed sequentially in "back-to-back" orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSF-REF-HD8 STIS/CCD ACQ F25ND3 MIRROR 1 .7 S (0.7 GS ACQ SCENARIO BASE1B3; 5512 S) SEQ 1-7 NON-INT Comments: K6V nearby star V=7.65 Exptime rounded to nearest 0.1 second, assumed to get SNR=100. ------------------------------------------------------------------------------------------------------------------------------------ 2 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 5512 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 POS TARG 0.0024795, 5512 GAIN=4 S) 0.0124497 ------------------------------------------------------------------------------------------------------------------------------------ 4 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 POS TARG -0.00247955, 5512 GAIN=4 S) 0.0124497 ------------------------------------------------------------------------------------------------------------------------------------ 5 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=8, 1 256 S (256 5512 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, GAIN=4, 1 256 S (256 5512 CR-SPLIT=8 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, GAIN=4, 1 192 S (192 5512 CR-SPLIT=6 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A 16228( 11) - 17-Feb-2022 19:02:52 - [ 7] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 7 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 8 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 7 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 8 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 9] Visit: 04 (V4-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100%; ORIENT 15D TO 30D FROM 02; AFTER 03 BY 0.5 Orbits TO 1.5 Orbits On Hold Comments: Additional Comments: Orientation: We wish to schedule this visit (4) at +30 deg from Visit 2, with the absolute orientation of Visit 2 unconstrained. We allow a relative orientation tolerence from +15 deg to +30 deg to assist in guide star selection and scheduling. NOTE to PC: Schedule as close to +30 deg from Visit 2 as possible. Relative Timing: This visit (4) should immediately follow Visit 3. I.e., They should be executed sequentially in "back-to-back" orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-TW-HYA STIS/CCD ACQ F28X50LP MIRROR 1 .2 S (0.2 GS ACQ SCENARIO BASE1B3; S) SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 V-TW-HYA STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 550 S (550 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-TW-HYA STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=3, 1 1425 S GAIN=4 (1425 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-TW-HYA 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 10] Visit: 53 (V3-PSF-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100% On Hold Comments: Additional Comments: PSF (HD 85512). PSF calibration target for TW Hya. V = 7.636. B - V = +1.15. Spex. K6Vk This is the PSF star calibrator for the flanking visits (1-4). We levy no orientation constraints on this visit (3). However, we choose this target since it has been used in the past for TW Hya. So as Visits 2 and 3 must be scheduled in sequential contiguous orbits, if scheduled at nominal roll (as we expect also Visit 2 will be) then we expect absolute orientations of Visits 2 and 3 to be very similar (within a few degrees). This is important so we maintain similar Sun and Beta angles for the science target and its PSF calibrator, Relative Timing: This visit (3) should immediately follow visit 2 and immediately precede visit 4. I.e., they should be executed sequentially in "back-to-back" orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSF-REF-HD8 STIS/CCD ACQ F25ND3 MIRROR 1 .7 S (0.7 GS ACQ SCENARIO BASE1B3; 5512 S) SEQ 1-7 NON-INT Comments: K6V nearby star V=7.65 Exptime rounded to nearest 0.1 second, assumed to get SNR=100. ------------------------------------------------------------------------------------------------------------------------------------ 2 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 5512 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 POS TARG 0.0024795, 5512 GAIN=4 S) 0.0124497 ------------------------------------------------------------------------------------------------------------------------------------ 4 PSF-REF-HD8 STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 56 S (56 POS TARG -0.00247955, 5512 GAIN=4 S) 0.0124497 ------------------------------------------------------------------------------------------------------------------------------------ 5 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=8, 1 256 S (256 5512 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, GAIN=4, 1 256 S (256 5512 CR-SPLIT=8 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 PSF-REF-HD8 STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, GAIN=4, 1 192 S (192 5512 CR-SPLIT=6 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A 16228( 11) - 17-Feb-2022 19:02:52 - [ 11] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 3 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A PSF-REF-HD85512 4 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 7 1 N/A 0 PSF-REF-HD85512 5 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 8 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 7 1 N/A 0 PSF-REF-HD85512 6 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 8 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 12] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 4 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 5 1 N/A 0 PSF-REF-HD85512 7 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 6 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 13] Visit: 54 (V4-TWHYA) Visit Requirements: PCS MODE FINE; GUID TOL 0.005"; GYRO MODE 3GOBAD; SCHED 100%; ORIENT 250D TO 262 D; ORIENT 296D TO 360 D; AFTER 53 BY 0.5 D TO 1.5 D On Hold Comments: Additional Comments: Orientation: We wish to schedule this visit (4) at +30 deg from Visit 2, with the absolute orientation of Visit 2 unconstrained. We allow a relative orientation tolerence from +15 deg to +30 deg to assist in guide star selection and scheduling. NOTE to PC: Schedule as close to +30 deg from Visit 2 as possible. Relative Timing: This visit (4) should immediately follow Visit 3. I.e., They should be executed sequentially in "back-to-back" orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V-TW-HYA STIS/CCD ACQ F28X50LP MIRROR 1 .2 S (0.2 GS ACQ SCENARIO BASE1B3; S) SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 V-TW-HYA STIS/CCD ACCUM BAR5 MIRROR SIZEAXIS2=100, CR-SPLIT=5, 1 550 S (550 GAIN=4 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 V-TW-HYA STIS/CCD ACCUM WEDGEA1.0 MIRROR SIZEAXIS2=427, CR-SPLIT=3, 1 1425 S GAIN=4 (1425 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ V-TW-HYA 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 1 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 2 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 3 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 4 1 N/A V-TW-HYA 2 STIS/CCD ACCUM BAR5 MIRROR none none none 5 1 N/A V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 1 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 2 1 N/A 0 V-TW-HYA 3 STIS/CCD ACCUM WEDGEA1. MIRROR none none none 3 1 N/A 0 16228( 11) - 17-Feb-2022 19:02:52 - [ 14] Summary Form for Proposal 16228 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BAR5, F25ND3, F28X50LP, WEDGEA1.0 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=3, CR-SPLIT=5, CR-SPLIT=6, CR-SPLIT=8, GAIN=4, SIZEAXIS2=100, SIZEAXIS2=427 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY .5 Orbits TO 1.5 Orbits, AFTER 02 BY .5 Orbits TO 1.5 Orbits, AFTER 03 BY 0.5 Orbits TO 1.5 Orbits, AFTER 53 BY 0.5 D TO 1.5 D, GS ACQ SCENARIO BASE1B3, GUID TOL 0.005", GYRO MODE 3GOBAD, ORIENT -30D TO -15D FROM 02, ORIENT 15D TO 30D FROM 02, ORIENT 250D TO 262 D, ORIENT 296D TO 360 D, PCS MODE FINE, POS TARG -0.00247955, 0.0124497, POS TARG 0.0024795, 0.0124497, SCHED 100%, SEQ 1-3 NON-INT, SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names PSF-REF-HD85512, V-TW-HYA ------------------------------------------------------------------------------------------------------------------------------------