16503( 7) - 07-Sep-2021 18:57:50 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16503 Version: 7 Check-in Time: 07-Sep-2021 18:57:50 STScI Edit Number: 1 Title Confirming the Host Star of a Second Planet in the LTT 1445ABC System ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jennifer Winters Harvard University Y CoI: Prof. David Charbonneau Harvard University N CoI: Dr. Jonathan Irwin Smithsonian Institution Astrophysical N Observatory CoI: Dr. Nikole Lewis Cornell University N CoI: Dr. Ryan Cloutier Harvard University N CoI: Dr. Karen Alicia Collins Smithsonian Institution Astrophysical N Observatory CoI: Prof. Jacob L. Bean University of Chicago N CoI: Prof. Andrew W. Howard California Institute of Technology N CoI: Dr. Andrew Vanderburg Massachusetts Institute of Technology N CoI: Mr. Martti Holst Kristiansen Brorfelde Observatory N CoI: Dr. Johanna Teske Carnegie Institution of Washington N CoI: Dr. Xavier Bonfils Universite de Grenoble I N CoI: Dr. Nicola Astudillo Defru Universidad Catolica de la Santisima N Concepcion CoI: Alton Spencer Western Connecticut State University N ------------------------------------------------------------------------------------ Abstract At 6.9 pc, the triple star system LTT 1445 ABC is the closest M dwarf system known to host a transiting, terrestrial exoplanet. We have detected a second transiting planet in the system; however, the shallow transit depth, low SNR light curves, and placement of all three stars on one 21" TESS pixel have thwarted ground-based efforts to determine which of the three stars is the host of the new planet. This is necessary in order to accurately measure the mass of either planet in the system and will be important for future JWST observations of one or both of the LTT 1445 planets. We propose to obtain HST WFC3/UVIS photometric observations in spatial scan mode of 2 transits of the newly detected planet candidate to determine which of the three stars is the host star. This confirmation can only be done with HST. ------------------------------------------------------------------------------------ Observations Description ------------------------ For our program, we will use WFC3/UVIS imaging in spatial scan mode with a photometric filter to accomplish our science goals. The need to spatially separate the three stars motivates our choice of WFC3 UVIS photometry. For this system, composed of three mid-to-late M dwarfs and two planets, photometric filters are preferred over the UVIS G280 and STIS G430L spectroscopic grisms because the stars have minimal flux at short wavelengths. Unlike STIS and WFC3 IR, the WFC3 UVIS CCD is incredibly stable and does not experience the same persistence (ramp) effects that the other detectors do, as shown by Wakeford et al., 2020; this has allowed us to include the first orbit in our analysis, 16503( 7) - 07-Sep-2021 18:57:50 - [ 2] where it would normally have to be removed, e.g., Deming et al., 2013 and Sing et al., 2016. In total we request 6 HST orbits to determine which of the three stars is being transited by the 3-day period planet. Because the shape of the transit is uncertain, we will observe the system for two transits (3 orbits per transit), where one orbit will capture the transit and an orbit on either side of the transit will establish an-out-of-transit baseline. For each observation we will use WFC3 in spatial scan mode to spread the light over a row of pixels on the detector and increase the SNR per exposure, as well as the observational efficiency. Although spatial scanning of WFC3/UVIS photometry is not as widely used as other modes for time-series observations, its use and expected performance are detailed in the WFC3 instrument handbook and at least two instrument science reports (ISR WFC3 2017-21 and WFC3 2012-08). Spatial scanning of WFC3/UVIS photometry has been used in at least four previous programs aimed at high-precision observations of exoplanet systems: 14621/15119 (PI Wang, Target=Beta Pic, Vmag=3.86, scan length=55 arcsec), 15129 (PI Burke, Target=Kepler-62, Vmag=13.8, scan length=6 arcsec), and 15473 (PI Fraine, Target=WASP-43, Vmag=12.4, scan length=19 arcsec). These programs highlight the versatility and flexibility of the WFC3/UVIS photometric scanning mode that in practice allows for semi-infinite combinations of filters, scan rates, scan lengths, and subarray sizes to maximize the achievable SNR per exposure. If selected, we will work closely with the staff at STScI to further optimize our scanning parameters and subarray choice to ensure the highest possible per point precision on our transit light curve and most efficient observing strategy. Using the WFC3 UVIS Imaging Scan Mode ETC, we calculate the exposure time, number of exposures per orbit, scan rate and length, and SNR per exposure. For each calculation we make a conservative estimate on the precision per transit to ensure that our measurements will meet our observational goals. Scan lengths on previous WFC3/UVIS spatial scan programs have ranged from 6 arcsec (Kepler-62) to 55 arcsec (Beta Pic). A 20 arcsec scan length should fit nicely into a 1024x1024 subarray, which would accommodate all three stars. In limiting the scan rate to less than 1 arcsec/s (per WFC3 handbook guidance), we cannot use the F350LP filter used in programs 15129 (Burke) and 15473 (Fraine) due to exceeding the maximum of 48000 electrons per pixel. Instead we opt for the F814W filter, which still offers exceptional throughput and wavelength coverage while avoiding the Halpha line that is sensitive to stellar flares, a consideration for this star system. The PSF width at the central wavelength of the F814W filter (802.4 nm) is approximately 1.844 pix or 0.074 arcsec. This will allow us to separate the traces/scans of the B and C components, currently separated by roughly 1 arcsec. In optimizing our observations for the F814W filter, we calculate that a scan rate of 0.85 arcsec/s keeps us just below the max electrons per pixel, resulting in roughly 23.5 second exposures with SNR~8000 (125 ppm precision). Thus, each 23.5 s exposure will constitute a 10-sigma detection of the 1200ppm deep transit. Our cadence will provide excellent coverage of the transit events, and with a 10-sigma precision per point we will accurately measure the transit parameters, notably the impact parameter. We note that spatial scanning on Hubble is also often used for astrometric 16503( 7) - 07-Sep-2021 18:57:50 - [ 3] measurements, emphasizing further that our photometric spatial scanning approach is the correct one to disentangle this system and determine the true properties of this exciting new planet. The observations proposed here make use of undithered imaging strategies that have become standard for time-series observations of exoplanets with Hubble. Dithering would in fact hinder our ability to achieve our required precision for this program and is not advisable when using the spatial scanning modes of WFC3. In each visit, we are targeting three spatially resolved point sources and making relative, not absolute, photometric measurements of their brightnesses. Robust strategies to deal with hot pixels and other detector artifacts that do not require dithering have been developed over the last decade of exoplanet observations with Hubble. Our proposed study will serve as an invaluable training set for the development of data reduction and interpretation techniques for WFC3 UVIS exoplanet observations, which will always offer the highest achievable precision at wavelengths inaccessible to JWST. A wide variety of analysis pipelines for Hubble WFC3 spatially-scanned data exist and can be easily adapted to tackle the proposed observations. We note that special care will need to be taken in selecting extraction apertures for the B and C stellar components of this system given their spatial proximity. ------------------------------------------------------------------------------------ 16503( 7) - 07-Sep-2021 18:57:50 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 BD-17-588 STAR, M V-IV RA=03H01M51.2140S +/- 0.00002", J2000 V = -5.5 V = 11.22 +/- 0.03 DEC=-16D35'33.45" +/- 0.00002" Reference Frame: ICRS Extended: NO Comments: The original target coordinates generated by the targetselector and retrieved from the SIMBAD database were RA: 03 01 51.4000 and DEC: -16 35 36.00. We have adjusted the target coordinate to refer to the center of the LTT1445 system J2000 RA: 03 01 51.214 and Dec: -16 35 33.45 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 -0.025736473296769175 -0.267931311928784 0.1456922 ------------------------------------------------------------------------------------------------------------------------------------ 16503( 7) - 07-Sep-2021 18:57:50 - [ 5] Visit: 02 (X-scan - 1) Visit Requirements: SCHED 100%; ORIENT 65D TO 115 D; ORIENT 245D TO 295 D; BETWEEN 01-JUN-2021:00:00:00 AND 10-SEP-2021:00:00:00; BETWEEN 11-SEP-2021:00:00:00 AND 01-JAN-2022:00:00:00; Period 3.1239030 D AND ZERO-PHASE HJD2458412.58095 On Hold Comments: 16503( 7) - 07-Sep-2021 18:57:50 - [ 6] Additional Comments: Scheduling requirements: Require 3 non-interrupt Hubble orbits to cover the transit event In order to achieve our science goals we must have good temporal coverage of the transit event. Standard UVIS subarray options are not compatible with our science goals as they all require buffer dumps before any given observing window closes (assuming scan length of 20", scan rate = 0.67 "/sec, and exposure time of 30 seconds). We have determined that a subarray 30" (750 pixels) in length (scan direction) and 15" (376 pixels) wide (across the triple star system) is best suited to achieving our science goals. First exposure is an imaging snapshot of the LTT1445 system in the same location as the scans that follow CS comments follow for Version 2: I deleted Visit 02 then copied Visit 01 to Visit 02 and began editing to see if I could make a suitable phase 2 without using AVAILABLE mode to request a custom subarray. I tried the 512x512 subarray near the amplifier. I turned off FLASH to save time and because CTE will not be an issue for scans and also this subarray is near the amplifier. I left the scan rate as it was from Version 1 (that choice and many others I am not evaluating at this stage of review - the purpose of this review is only to demonstrate that a supported 512x512 subarray can satisfy the phase 1 requirements. I adjusted the POSTARGS but they will need re-adjustment to put the center of the triple star system in the center of the subarray: I did not do that. I took two staring-mode snapshot exposures at the outset of the program, one short and one long; the short one will permit unsaturated PSFs of the bright target stars and the long one will help pick up any faint stars in the field. I put 17 pairs of 22-s exposures in the rest of orbit 1, and then 18 pairs of 22-s exposures in each of orbits 2 and 3 of this visit; 748+792+792 = 2332 s exposure total. In my experimental Visit 2 I also removed the visit orient constraint and I didn't fine tune the scan orient to uniformly fill pixel phase; those details should be worked out in the next resubmission. The purpose of this version is only to demonstrate the 512x512 can work. The shutter-open time (792 s) is 29% of the typical 2700-s window in each HST orbit. That could be improved with a two-line scan. Observer Comments follow for Version 3: -We have adopted the 512x512 subarray observing strategy recommended by the CS. We have opted to stick with a single line scan to avoid potential issues in the data reduction phase in separating the scans of the three stellar components in the system. Although less efficient, the expected per exposure precision should allow us to meet our science goals. -We have adjusted the scan POSTARG to hopefully better center the scan in the subarray. Note that we have specified the target coordinates that represent the center of the LTT1445 A and BC stellar components, so the system should be well centered perpendicular to the scan. -In determining orient ranges for this observation, we considered our goal of keeping the scans of the A and BC components of the system, which are separated by 7", separated (also note that the separation between the B and C components is 1"). Given that our scan length is 14.74", we will need an orient range of 25 degrees to separate the A and BC components. Separating the B and C components would require an orient constraint of 3 degrees. We have specified the visit orient ranges assuming that 135 degrees aligns the Y-axis (scan direction) with North. The LTT1445ABC stars lay roughly along a line perpendicular to 45 degrees from North. -We have included between constraints to avoid instances of planet b and planet c transiting within the same window. For Cycle 28 the following should be avoided: BJD 2458996.75107 MJD_UTC 58996.2546 Cyc 187 2020-05-27 06:06:38 UT dt -1.5 hr BJD 2459034.23787 MJD_UTC 59033.7392 Cyc 199 2020-07-03 17:44:27 UT dt -2.1 hr BJD 2459071.72467 MJD_UTC 59071.2230 Cyc 211 2020-08-10 05:21:05 UT dt -2.7 hr BJD 2459109.21147 MJD_UTC 59108.7071 Cyc 223 2020-09-16 16:58:14 UT dt -3.3 hr BJD 2459355.99957 MJD_UTC 59355.5033 Cyc 302 2021-05-21 12:04:48 UT dt 3.6 hr BJD 2459393.48637 MJD_UTC 59392.9882 Cyc 314 2021-06-27 23:42:56 UT dt 3.0 hr BJD 2459430.97317 MJD_UTC 59430.4720 Cyc 326 2021-08-04 11:19:40 UT dt 2.4 hr BJD 2459468.45997 MJD_UTC 59467.9560 Cyc 338 2021-09-10 22:56:36 UT dt 1.8 hr BJD 2459505.94677 MJD_UTC 59505.4412 Cyc 350 2021-10-18 10:35:23 UT dt 1.2 hr BJD 2459543.43357 MJD_UTC 59542.9284 Cyc 362 2021-11-24 22:16:56 UT dt 0.6 hr BJD 2459580.92037 MJD_UTC 59580.4174 Cyc 374 2022-01-01 10:01:06 UT dt 0.0 hr 16503( 7) - 07-Sep-2021 18:57:50 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 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 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 1 10 S (10 POS TARG 0, 0; SEQ 1-3 S 2C-SUB S) NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 1 0.5 S (0.5 POS TARG 0, 0; PHASE S 2C-SUB S) 0.9699894651 TO 0.97443547027 ------------------------------------------------------------------------------------------------------------------------------------ 3 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 15 22.0 S POS TARG -7.35, 0; S 2C-SUB (660 S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 4 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 16 22. S (704 POS TARG -7.35, 0.0; S 2C-SUB S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip; SEQ 4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 16 22.0 S POS TARG -7.35, 0.0; S 2C-SUB (704 S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip; SEQ 5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 1 WFC3/UVI ACCUM UVIS2-C5 F814W none none none none 1 N/A S 12C-SUB BD-17-588 2 WFC3/UVI ACCUM UVIS2-C5 F814W none none none none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 1 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 1 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 1 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 2 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 10] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 2 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 3 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 3 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 12] Visit: 03 (X-scan - 2) Visit Requirements: SCHED 100%; ORIENT 65D TO 115 D; ORIENT 245D TO 295 D; BETWEEN 01-JUN-2021:00:00:00 AND 10-SEP-2021:00:00:00; BETWEEN 11-SEP-2021:00:00:00 AND 01-JAN-2022:00:00:00; Period 3.1239030 D AND ZERO-PHASE HJD2458412.58095 On Hold Comments: 16503( 7) - 07-Sep-2021 18:57:50 - [ 13] Additional Comments: Scheduling requirements: Require 3 non-interrupt Hubble orbits to cover the transit event In order to achieve our science goals we must have good temporal coverage of the transit event. Standard UVIS subarray options are not compatible with our science goals as they all require buffer dumps before any given observing window closes (assuming scan length of 20", scan rate = 0.67 "/sec, and exposure time of 30 seconds). We have determined that a subarray 30" (750 pixels) in length (scan direction) and 15" (376 pixels) wide (across the triple star system) is best suited to achieving our science goals. First exposure is an imaging snapshot of the LTT1445 system in the same location as the scans that follow CS comments follow for Version 2: I deleted Visit 02 then copied Visit 01 to Visit 02 and began editing to see if I could make a suitable phase 2 without using AVAILABLE mode to request a custom subarray. I tried the 512x512 subarray near the amplifier. I turned off FLASH to save time and because CTE will not be an issue for scans and also this subarray is near the amplifier. I left the scan rate as it was from Version 1 (that choice and many others I am not evaluating at this stage of review - the purpose of this review is only to demonstrate that a supported 512x512 subarray can satisfy the phase 1 requirements. I adjusted the POSTARGS but they will need re-adjustment to put the center of the triple star system in the center of the subarray: I did not do that. I took two staring-mode snapshot exposures at the outset of the program, one short and one long; the short one will permit unsaturated PSFs of the bright target stars and the long one will help pick up any faint stars in the field. I put 17 pairs of 22-s exposures in the rest of orbit 1, and then 18 pairs of 22-s exposures in each of orbits 2 and 3 of this visit; 748+792+792 = 2332 s exposure total. In my experimental Visit 2 I also removed the visit orient constraint and I didn't fine tune the scan orient to uniformly fill pixel phase; those details should be worked out in the next resubmission. The purpose of this version is only to demonstrate the 512x512 can work. The shutter-open time (792 s) is 29% of the typical 2700-s window in each HST orbit. That could be improved with a two-line scan. Observer Comments follow for Version 3: -We have adopted the 512x512 subarray observing strategy recommended by the CS. We have opted to stick with a single line scan to avoid potential issues in the data reduction phase in separating the scans of the three stellar components in the system. Although less efficient, the expected per exposure precision should allow us to meet our science goals. -We have adjusted the scan POSTARG to hopefully better center the scan in the subarray. Note that we have specified the target coordinates that represent the center of the LTT1445 A and BC stellar components, so the system should be well centered perpendicular to the scan. -In determining orient ranges for this observation, we considered our goal of keeping the scans of the A and BC components of the system, which are separated by 7", separated (also note that the separation between the B and C components is 1"). Given that our scan length is 14.74", we will need an orient range of 25 degrees to separate the A and BC components. Separating the B and C components would require an orient constraint of 3 degrees. We have specified the visit orient ranges assuming that 135 degrees aligns the Y-axis (scan direction) with North. The LTT1445ABC stars lay roughly along a line perpendicular to 45 degrees from North. -We have included between constraints to avoid instances of planet b and planet c transiting within the same window. For Cycle 28 the following should be avoided: BJD 2458996.75107 MJD_UTC 58996.2546 Cyc 187 2020-05-27 06:06:38 UT dt -1.5 hr BJD 2459034.23787 MJD_UTC 59033.7392 Cyc 199 2020-07-03 17:44:27 UT dt -2.1 hr BJD 2459071.72467 MJD_UTC 59071.2230 Cyc 211 2020-08-10 05:21:05 UT dt -2.7 hr BJD 2459109.21147 MJD_UTC 59108.7071 Cyc 223 2020-09-16 16:58:14 UT dt -3.3 hr BJD 2459355.99957 MJD_UTC 59355.5033 Cyc 302 2021-05-21 12:04:48 UT dt 3.6 hr BJD 2459393.48637 MJD_UTC 59392.9882 Cyc 314 2021-06-27 23:42:56 UT dt 3.0 hr BJD 2459430.97317 MJD_UTC 59430.4720 Cyc 326 2021-08-04 11:19:40 UT dt 2.4 hr BJD 2459468.45997 MJD_UTC 59467.9560 Cyc 338 2021-09-10 22:56:36 UT dt 1.8 hr BJD 2459505.94677 MJD_UTC 59505.4412 Cyc 350 2021-10-18 10:35:23 UT dt 1.2 hr BJD 2459543.43357 MJD_UTC 59542.9284 Cyc 362 2021-11-24 22:16:56 UT dt 0.6 hr BJD 2459580.92037 MJD_UTC 59580.4174 Cyc 374 2022-01-01 10:01:06 UT dt 0.0 hr 16503( 7) - 07-Sep-2021 18:57:50 - [ 14] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 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 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 1 0.5 S (0.5 POS TARG 0, 0; PHASE S 2C-SUB S) 0.96665496122 TO 0.97443547027; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 1 10 S (10 POS TARG 0, 0 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 15 22.0 S POS TARG -7.35, 0; S 2C-SUB (660 S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 4 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 16 22. S (704 POS TARG -7.35, 0.0; S 2C-SUB S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip; SEQ 4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 BD-17-588 WFC3/UVI ACCUM UVIS2-C51 F814W 16 22.0 S POS TARG -7.35, 0.0; S 2C-SUB (704 S) SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip; SEQ 5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 1 WFC3/UVI ACCUM UVIS2-C5 F814W none none none none 1 N/A S 12C-SUB BD-17-588 2 WFC3/UVI ACCUM UVIS2-C5 F814W none none none none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 1 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 15] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 1 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 16] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 1 N/A S 12C-SUB BD-17-588 3 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 1 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 2 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 17] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 2 N/A S 12C-SUB BD-17-588 4 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 2 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 1 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 2 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 3 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 4 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 5 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 6 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 3 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 18] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 7 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 8 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 9 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 10 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 11 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 12 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 13 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 14 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 15 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 3 N/A S 12C-SUB BD-17-588 5 WFC3/UVI ACCUM UVIS2-C5 F814W none none 16 none 3 N/A S 12C-SUB 16503( 7) - 07-Sep-2021 18:57:50 - [ 19] Summary Form for Proposal 16503 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-JUN-2021:00:00:00 AND 10-SEP-2021:00:00:00, BETWEEN 11-SEP-2021:00:00:00 AND 01-JAN-2022:00:00:00, ORIENT 245D TO 295 D, ORIENT 65D TO 115 D, PHASE 0.96665496122 TO 0.97443547027, PHASE 0.9699894651 TO 0.97443547027, POS TARG -7.35, 0, POS TARG -7.35, 0.0, POS TARG 0, 0, Period 3.1239030 D AND ZERO-PHASE HJD2458412.58095, SCHED 100%, SEQ 1-3 NON-INT, SEQ 4 NON-INT, SEQ 5 NON-INT, SPATIAL SCAN 0.67, 3.7702 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names BD-17-588 ------------------------------------------------------------------------------------------------------------------------------------