16795( 11) - 03-Sep-2021 13:48:29 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16795 Version: 11 Check-in Time: 03-Sep-2021 13:48:29 STScI Edit Number: 3 Title Dust emission process in newly discovered active asteroids P/2021 L4 ------------------------------------------------------------------------------------ Type Cycle GO/DD 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jessica Agarwal Technische Universitaet Braunschweig Y CoI: Dr. Yoonyoung Kim Technische Universitaet Braunschweig Y CoI: Dr. David Jewitt University of California - Los Angeles N CoI: Maria Mastropietro Technische Universitaet Braunschweig N CoI: Max Mutchler Space Telescope Science Institute Y CoI: Dr. Harold A. Weaver The Johns Hopkins University Applied N Physics Laboratory ------------------------------------------------------------------------------------ Abstract We request 3 orbits of DD time to identify the cause of dust emission in newly discovered active asteroid P/2021 L4. The orbit of L4 is in the outer main belt, and similar to those of two other asteroids with confirmed activity likely driven by the sublimation of ice. However, the activity in L4 can be dated to an epoch more than 1.5 years after perihelion, which make sublimation-driven activity questionable, with possible alternatives being an impact or rotational mass shedding. We here seek to find out about the cause of activity from studying the distribution and dynamical evolution of dust and debris near the nucleus and in the dust tail, and to characterise the nucleus itself. This will help us to constrain the depth of buried ice in this outer-main-belt object, and lay the basis for follow-up observations during the next perihelion passage in 2025. We request DD time because L4 was discovered after the last regular GO proposal deadline, and because we expect the debris to disperse on timescales of weeks to a few months. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this program is to characterise the nucleus and dust environment of newly detected active asteroid L4. The first orbit (out of a total 3) should be scheduled as soon as possible to catch the dust field in its current state. The second visit should be scheduled 2-4 weeks after the first to study the motion of potential fragments or a binary system. The third visit should be scheduled as close as possible to October 03 (when L4 will enter HST's solar exclusion zone). The predicted total magnitude of L4 is V=21 in July, decreasing to 22 by late September. We expect that the nucleus or largest fragment will be 1-2 mag fainter, V = 23 - 24. Since this is a newly discovered asteroid with a short arc of observations, the JPL ephemeris will be updated as new astrometry is being reported to the Minor Planet Center and JPL. We will monitor this and request to update the ephemeris in APT when a new orbit solution has been published. 16795( 11) - 03-Sep-2021 13:48:29 - [ 2] To mitigate the ephemeris uncertainty, we would like to use the 2K2C sub-detector of WFC3/UVIS (instead of the 1K-subarray as in the phase 1 proposal). This will give us maximum protection against the position uncertainty, at the moderate cost of increased readout time. To compensate for increased readout time, we plan to reduce the number of exposures from 8 to 6, such that now in each orbit, we plan to take 6 exposures of 205s and perform a 2-point dither pattern to mitigate hot pixels and cosmic ray hits, obtaining 3 exposures at each dither point. We plan to use the wide bandpass filter F606W. The exposure time is flagged with a CTE warning. However, when running the ETC with the zodiacal light background for the actual target position in July 2021 (WFC3UVIS.im.1522864), the background flux increases to 16 electrons/pixel. Due to the presence of extended dust, we expect the actual flux to be even higher, and therefore expect the CTE to be acceptable. ------------------------------------------------------------------------------------ 16795( 11) - 03-Sep-2021 13:48:29 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: P2021L4 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Active Asteroid ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=3.165314289622532, E=0.1193576578627996, I=16.97017863084731 , O=243.2235429431992, W=234.7512400659903, M=113.7169141429207, EQUINOX=J2000, EPOCH=16-JUN-2021:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 21 The ephemeris will need to be updated regularly, in particular for visits 2 and 3. We do not expect the necessity of late ephemeris updates. Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: P2021L4-2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Active Asteroid ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=3.165095001722153, E=0.1187392431431302, I=16.96260314419682 , O=243.2248890332734, W=234.6698922988284, M=119.8238708365419, EQUINOX=J2000, EPOCH=20-JUL-2021:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 21 The ephemeris will need to be updated regularly, in particular for visits 2 and 3. We do not expect the necessity of late ephemeris updates. Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16795( 11) - 03-Sep-2021 13:48:29 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: P2021L4-3 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Active Asteroid ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=3.165057892850544, E=0.1186608143484228, I=16.96177845929909 , O=243.2250068856324, W=234.6547896738686, M=120.0241691048568, EQUINOX=J2000, EPOCH=21-JUL-2021:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 21 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16795( 11) - 03-Sep-2021 13:48:29 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16795( 11) - 03-Sep-2021 13:48:29 - [ 6] Visit: 01 (V1) Visit Requirements: BETWEEN 26-JUL-2021:00:00 AND 26-JUL-2021:00:40; BETWEEN 26-JUL-2021:03:10 AND 26-JUL-2021:05:30; BETWEEN 26-JUL-2021:06:50 AND 26-JUL-2021:11:50; BETWEEN 26-JUL-2021:13:10 AND 26-JUL-2021:16:40; BETWEEN 26-JUL-2021:18:00 AND 27-JUL-2021:09:00; BETWEEN 27-JUL-2021:11:10 AND 27-JUL-2021:19:30; BETWEEN 27-JUL-2021:21:20 AND 28-JUL-2021:00:20; BETWEEN 28-JUL-2021:01:30 AND 28-JUL-2021:18:10; BETWEEN 28-JUL-2021:20:40 AND 29-JUL-2021:04:50; BETWEEN 29-JUL-2021:06:10 AND 29-JUL-2021:16:00; BETWEEN 29-JUL-2021:20:30 AND 30-JUL-2021:03:20; BETWEEN 30-JUL-2021:04:30 AND 30-JUL-2021:07:50; BETWEEN 30-JUL-2021:09:00 AND 30-JUL-2021:11:00; BETWEEN 30-JUL-2021:12:20 AND 30-JUL-2021:12:50; BETWEEN 30-JUL-2021:15:10 AND 30-JUL-2021:19:30; BETWEEN 30-JUL-2021:21:50 AND 31-JUL-2021:03:20; BETWEEN 31-JUL-2021:05:30 AND 31-JUL-2021:06:10; BETWEEN 31-JUL-2021:08:00 AND 31-JUL-2021:20:40; BETWEEN 31-JUL-2021:23:20 AND 01-AUG-2021:00:10; BETWEEN 01-AUG-2021:02:10 AND 01-AUG-2021:15:20; BETWEEN 01-AUG-2021:16:50 AND 02-AUG-2021:00:00 On Hold Comments: Additional Comments: 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 P2021L4 WFC3/UVI ACCUM UVIS2-2K2 F606W 3 205 S PATTERN 1 1 S C-SUB (1230 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 | ------------------------------------------------------------------------------------------------------------------------------------ P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 1 none 1 N/A S 2C-SUB P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 2 none 1 N/A S 2C-SUB P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 3 none 1 N/A S 2C-SUB P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 1 none 1 N/A S 2C-SUB P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 2 none 1 N/A S 2C-SUB P2021L4 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 3 none 1 N/A S 2C-SUB 16795( 11) - 03-Sep-2021 13:48:29 - [ 7] Visit: 02 (V2) Visit Requirements: BETWEEN 16-AUG-2021:00:00:00 AND 16-AUG-2021:08:10:00; BETWEEN 16-AUG-2021:09:50:00 AND 17-AUG-2021:08:00:00; BETWEEN 17-AUG-2021:09:50:00 AND 17-AUG-2021:18:00:00; BETWEEN 17-AUG-2021:20:20:00 AND 18-AUG-2021:09:20:00; BETWEEN 18-AUG-2021:11:10:00 AND 18-AUG-2021:11:20:00; BETWEEN 18-AUG-2021:13:10:00 AND 18-AUG-2021:22:20:00; BETWEEN 19-AUG-2021:00:20:00 AND 19-AUG-2021:15:40:00; BETWEEN 19-AUG-2021:18:40:00 AND 23-AUG-2021:07:00:00; BETWEEN 23-AUG-2021:08:50:00 AND 23-AUG-2021:20:30:00; BETWEEN 23-AUG-2021:22:50:00 AND 24-AUG-2021:02:10:00; BETWEEN 24-AUG-2021:04:30:00 AND 24-AUG-2021:17:00:00; BETWEEN 24-AUG-2021:19:10:00 AND 25-AUG-2021:07:40:00; BETWEEN 25-AUG-2021:09:30:00 AND 27-AUG-2021:09:50:00; BETWEEN 27-AUG-2021:11:40:00 AND 27-AUG-2021:19:10:00; BETWEEN 27-AUG-2021:20:50:00 AND 28-AUG-2021:04:20:00; BETWEEN 28-AUG-2021:06:30:00 AND 28-AUG-2021:21:10:00; BETWEEN 28-AUG-2021:23:00:00 AND 29-AUG-2021:10:00:00; BETWEEN 29-AUG-2021:11:30:00 AND 30-AUG-2021:00:00:00 On Hold Comments: Additional Comments: 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 P2021L4-2 WFC3/UVI ACCUM UVIS2-2K2 F606W 3 200 S SEQ 1 NON-INT; PATTERN 1 S C-SUB (1200 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 1 none tbd N/A S 2C-SUB P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 2 none tbd N/A S 2C-SUB P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 3 none tbd N/A S 2C-SUB P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 1 none tbd N/A S 2C-SUB P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 2 none tbd N/A S 2C-SUB P2021L4-2 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 3 none tbd N/A S 2C-SUB 16795( 11) - 03-Sep-2021 13:48:29 - [ 8] Visit: 03 (V3) Visit Requirements: BETWEEN 26-SEP-2021:01:00:00 AND 26-SEP-2021:16:20:00; BETWEEN 26-SEP-2021:23:30:00 AND 27-SEP-2021:18:20:00; BETWEEN 28-SEP-2021:01:00:00 AND 03-OCT-2021:15:40:00; BETWEEN 04-OCT-2021:00:00:00 AND 04-OCT-2021:12:00:00 On Hold Comments: Additional Comments: 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 P2021L4-3 WFC3/UVI ACCUM UVIS2-2K2 F606W 3 205 S SEQ 1 NON-INT; PATTERN 1 S C-SUB (1230 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 3 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 3 none 1 N/A S 2C-SUB 16795( 11) - 03-Sep-2021 13:48:29 - [ 9] Visit: 04 (V4) Visit Requirements: AFTER 03 BY 0.8 Orbits TO 1.3 Orbits On Hold Comments: Additional Comments: 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 P2021L4-3 WFC3/UVI ACCUM UVIS2-2K2 F606W 3 205 S SEQ 1 NON-INT; PATTERN 1 S C-SUB (1230 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 3 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 3 none 1 N/A S 2C-SUB 16795( 11) - 03-Sep-2021 13:48:29 - [ 10] Visit: 05 (V5) Visit Requirements: AFTER 03 BY 1.8 Orbits TO 3.3 Orbits On Hold Comments: Additional Comments: 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 P2021L4-3 WFC3/UVI ACCUM UVIS2-2K2 F606W 3 205 S SEQ 1 NON-INT; PATTERN 1 S C-SUB (1230 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none 3 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 1 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 2 none 1 N/A S 2C-SUB P2021L4-3 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none 3 none 1 N/A S 2C-SUB 16795( 11) - 03-Sep-2021 13:48:29 - [ 11] Summary Form for Proposal 16795 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-2K2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 03 BY 0.8 Orbits TO 1.3 Orbits, AFTER 03 BY 1.8 Orbits TO 3.3 Orbits, BETWEEN 01-AUG-2021:02:10 AND 01-AUG-2021:15:20, BETWEEN 01-AUG-2021:16:50 AND 02-AUG-2021:00:00, BETWEEN 04-OCT-2021:00:00:00 AND 04-OCT-2021:12:00:00, BETWEEN 16-AUG-2021:00:00:00 AND 16-AUG-2021:08:10:00, BETWEEN 16-AUG-2021:09:50:00 AND 17-AUG-2021:08:00:00, BETWEEN 17-AUG-2021:09:50:00 AND 17-AUG-2021:18:00:00, BETWEEN 17-AUG-2021:20:20:00 AND 18-AUG-2021:09:20:00, BETWEEN 18-AUG-2021:11:10:00 AND 18-AUG-2021:11:20:00, BETWEEN 18-AUG-2021:13:10:00 AND 18-AUG-2021:22:20:00, BETWEEN 19-AUG-2021:00:20:00 AND 19-AUG-2021:15:40:00, BETWEEN 19-AUG-2021:18:40:00 AND 23-AUG-2021:07:00:00, BETWEEN 23-AUG-2021:08:50:00 AND 23-AUG-2021:20:30:00, BETWEEN 23-AUG-2021:22:50:00 AND 24-AUG-2021:02:10:00, BETWEEN 24-AUG-2021:04:30:00 AND 24-AUG-2021:17:00:00, BETWEEN 24-AUG-2021:19:10:00 AND 25-AUG-2021:07:40:00, BETWEEN 25-AUG-2021:09:30:00 AND 27-AUG-2021:09:50:00, BETWEEN 26-JUL-2021:00:00 AND 26-JUL-2021:00:40, BETWEEN 26-JUL-2021:03:10 AND 26-JUL-2021:05:30, BETWEEN 26-JUL-2021:06:50 AND 26-JUL-2021:11:50, BETWEEN 26-JUL-2021:13:10 AND 26-JUL-2021:16:40, BETWEEN 26-JUL-2021:18:00 AND 27-JUL-2021:09:00, BETWEEN 26-SEP-2021:01:00:00 AND 26-SEP-2021:16:20:00, BETWEEN 26-SEP-2021:23:30:00 AND 27-SEP-2021:18:20:00, BETWEEN 27-AUG-2021:11:40:00 AND 27-AUG-2021:19:10:00, BETWEEN 27-AUG-2021:20:50:00 AND 28-AUG-2021:04:20:00, BETWEEN 27-JUL-2021:11:10 AND 27-JUL-2021:19:30, BETWEEN 27-JUL-2021:21:20 AND 28-JUL-2021:00:20, BETWEEN 28-AUG-2021:06:30:00 AND 28-AUG-2021:21:10:00, BETWEEN 28-AUG-2021:23:00:00 AND 29-AUG-2021:10:00:00, BETWEEN 28-JUL-2021:01:30 AND 28-JUL-2021:18:10, BETWEEN 28-JUL-2021:20:40 AND 29-JUL-2021:04:50, BETWEEN 28-SEP-2021:01:00:00 AND 03-OCT-2021:15:40:00, BETWEEN 29-AUG-2021:11:30:00 AND 30-AUG-2021:00:00:00, BETWEEN 29-JUL-2021:06:10 AND 29-JUL-2021:16:00, BETWEEN 29-JUL-2021:20:30 AND 30-JUL-2021:03:20, BETWEEN 30-JUL-2021:04:30 AND 30-JUL-2021:07:50, BETWEEN 30-JUL-2021:09:00 AND 30-JUL-2021:11:00, BETWEEN 30-JUL-2021:12:20 AND 30-JUL-2021:12:50, BETWEEN 30-JUL-2021:15:10 AND 30-JUL-2021:19:30, BETWEEN 30-JUL-2021:21:50 AND 31-JUL-2021:03:20, BETWEEN 31-JUL-2021:05:30 AND 31-JUL-2021:06:10, BETWEEN 31-JUL-2021:08:00 AND 31-JUL-2021:20:40, BETWEEN 31-JUL-2021:23:20 AND 01-AUG-2021:00:10, PATTERN 1 1, SEQ 1 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names P2021L4, P2021L4-2, P2021L4-3 ------------------------------------------------------------------------------------------------------------------------------------