Long-Term Evolution of Dimorphos's Dust Tail Created by the DART Impact

0 Assigned ID: 3879 ----- Attempting Submission 1 (Mon Dec 12 00:23:23 GMT 2022) ----- The list of Investigators does not match the STScI records for this program. There are 9 identical visits, 1 orbit each. Each orbit currently has 471 sec of unused visibility, but that can be tweaked during the next iteration. We hope to execute visit #1 during Jan 16-22, if possible, and then subsequent visits at 3 week intervals (cadence). 1/6/2023, JYL - Adjusted sequence in visit 2 to include full-frame, long exposures for testing. 1/6/2023, JYL - Updated POSTARG of the last exposure for dither. 1/6/2023, JYL - Adjusted sequence in visit 02 to reduce tracking smearing for testing. - Replace time link by "time between" for all visits. 1/9/2023, JYL - Adjust visit 02 sequence to improve tracking. 1/29/2023, JYL - Adjust visit 03 sequence to improve SNR. - Updated target ephemeris using new JPL solution 203 (Jan 25, 2023) - Copied the same sequence to visits 04 - 09. 1/29/2023, JYL - Further adjusted seuqence in visits 03 - 09 to remove short (60 s) exposures. 1/30/2023, JYL - Adjusted visit 03 to include one short exposure for sharp PSF. 2/13/2023, JYL - Adjusted visit 04 to be the same as visit 03. 3/5/2023, JYL - Move the orbit from HOPR92444 (and name it visit 15) to be together with visit 05 to boost the SNR 3/28/2023, JYL - Move visit 16 to the same window as visit 06 - Move visits 08 and 09 to the same window as visit 07 4/18/2023, JYL - Move visits 07, 08, 09 later by one week. 4/27/2023, JYL - Adjust the window for visits 07, 08, 09. 2/13/2024, JYL - Add Co-I Bin Yang -1177714671 ----- Attempting Submission 1 (Thu Dec 29 15:43:16 GMT 2022) ----- ----- Attempting Submission 2 (Fri Jan 06 14:12:43 GMT 2023) ----- HST Phase II Proposal 17292 successfully submitted. Receipt: # 17292-2 ----- Attempting Submission 3 (Fri Jan 06 14:22:33 GMT 2023) ----- ----- Attempting Submission 4 (Sat Jan 07 00:33:23 GMT 2023) ----- ----- Attempting Submission 5 (Tue Jan 10 04:04:17 GMT 2023) ----- ----- Attempting Submission 6 (Mon Jan 30 01:51:44 GMT 2023) ----- HST Phase II Proposal 17292 successfully submitted. Receipt: # 17292-6 ----- Attempting Submission 7 (Mon Jan 30 02:06:38 GMT 2023) ----- ----- Attempting Submission 8 (Tue Jan 31 04:19:00 GMT 2023) ----- ----- Attempting Submission 9 (Tue Feb 14 04:43:24 GMT 2023) ----- ----- Attempting Submission 10 (Mon Mar 06 03:37:35 GMT 2023) ----- ----- Attempting Submission 11 (Wed Mar 29 03:14:27 GMT 2023) ----- ----- Attempting Submission 12 (Tue Apr 18 19:18:28 GMT 2023) ----- ----- Attempting Submission 13 (Thu Apr 27 17:49:44 GMT 2023) ----- ----- Attempting Submission 14 (Tue Feb 13 01:58:53 GMT 2024) ----- This submission is just to add a Co-I. Long-Term Evolution of Dimorphos's Dust Tail Created by the DART Impact NASA's DART (Double Asteroid Redirection Test) spacecraft successfully impacted Dimorphos on September 26, 2022 and created an active asteroid that potentially provides invaluable context for interpreting observations of natural active asteroids. Studying Dimorphos's ejecta and tail evolution carries profound implications for the impact disruption process of asteroids, one of the major processes in asteroid evolution. The HST observations (GO-16674) immediately following the impact revealed spectacular details of the ejecta evolution from excavation to the development of a long dust tail that has remained visible from the ground since ~3 hours after impact. It is the first time that the detailed formational process of an asteroid tail has ever been observed. As the continuation of the highly successful HST program to observe the DART ejecta (GO-16674), we request 9 orbits of HST DD time to monitor the long-term evolution of the remarkable tail of Dimorphos with the HST/WFC3 at a cadence of approximately 3 weeks from late January to early July 2023. The new observations will provide essential information about the mm and larger particles and the dynamics of slow ejecta dust in the Didymos binary system under the influence of solar radiation pressure. Large particles are critical to constrain the total ejecta mass to estimate the momentum transfer in the DART impact independent of the orbital period change of the binary system. Long-term monitoring will essentially connect the Dimorphos's tail with those of natural active asteroids. HST's high resolution, high sensitivity, and stable optical performance are crucial for our proposed observations. Observe the Didymos system for 1 orbit every 3 weeks starting the week of 2023-Jan-16, if possible, and extending until a total of 9 orbits of observations are completed. Each orbit will consist of a series of pairs of WFC3/UVIS2 exposures, using exp times of 10s and 100s, using the typical WFC3/UVIS box dither. Each observation will be made using the WFC3 UVIS2-C1K1C-SUB aperture with the target centered in that aperture. The proposal team is essentially the same team of the previous, highly successful HST program GO-16674 to observe the Dimorphos's ejecta during the DART impact, with the additions of a few Co-Is. The team has extensive experience with HST observations, a strong association with the DART Investigation Team, and expertise in studying active asteroids, dust brightness and optical depth measurements and modeling, and ejecta and tail dynamic modeling. These expertise areas cover all the required aspects to perform the proposed observations and to analyze the data. PI Jian-Yang Li (Planet. Sci. Inst.) was the PI of the DART ejecta observing program GO-16674. He is a highly experienced HST observer who has led or been involved in many HST imaging and spectroscopic programs for asteroids and comets over the past 15 years, including a number of time-critical ones that required close coordination with the STScI during the scheduling and execution. He has also been involved in many observations and data analysis of cometary comae, including the Deep Impact mission that impacted comet 9P/Tempel 1. Co-Is Andy Cheng (JHU/APL) and Andy Rivkin (JHU/APL) are the DART mission team co-leads and have profound knowledge about all aspects of the mission. In addition, Rivkin's research has focused on asteroid observations since the 1990s. Co-I Cristina Thomas (N. Arizona U.) is the DART Observations Working Group Lead who oversees all aspects of the coordinated observing campaign to support the DART mission. She was the PI of HST UV spectral observations of Jupiter Trojan asteroids that are targets of the upcoming Lucy mission. Co-I Eugene Fahnestock (Caltech/JPL) is the DART Ejecta Working Group Lead and an expert on impact ejecta dynamic simulation and modeling. Co-I Harold Weaver is a veteran of HST imaging and spectroscopy observer and has been extensively involved in many previous HST observations of active asteroids, including P/2010 A2, Scheila, 311P/PanSTARRS, and Gault. Co-I Matthew Knight (U.S. Naval Academy) is an expert on observing and interpreting cometary coma morphology from ground-based telescopes and HST. Co-I Steven Chesley is an expert on the dynamic modeling of asteroids and comets and dust. Co-I Ludmilla Kolokolova (U. Maryland) is an expert on the modeling of the optical properties of dust from observational data, including HST images, and a DART Participating Scientist who will model the DART ejecta from both the LICIACube images and HST images of ejecta, based on her similar work on the Deep Impact ejecta. Co-I Masatoshi Hirabayashi has expertise in quantifying the mechanisms for mass ejection from active asteroids and ejecta evolution. He has also developed finite element models to characterize the thermal condition of an irregularly shaped body to determine solar radiation pressure-driven non-gravitational forces. Co-I Yun Zhang is experienced in dust dynamics and the internal structures of asteroids through numerical models. Solar System Astronomy 0 false SUPPORTED SOLAR SYSTEM NO ASTEROID Asteroid Didymos (65803) TYPE=ASTEROID,A=1.643091249342108,E=0.3835237757664423,I=3.41380667080487 ,O=72.9955220559403,W=319.5574473815775,M=6.411907609321696,EQUINOX=J2000,EPOCH=04-NOV-2022:12:00:00,EpochTimeScale=TDB,R0=1. ,A1=0.,A2=-1.053918254001E-14,A3=0. ,ALN=1.,NM=2.,NN=0.,NK=0.,AMRAT=0. EARTH SOLAR SYSTEM NO ASTEROID Didymos updated elements TYPE=ASTEROID,A=1.642909987989381,E=0.3834558030859849,I=3.414094955971987 ,O=72.99370205487129,W=319.5579247099636,M=10.62609742217431,EQUINOX=J2000,EPOCH=13-NOV-2022:12:00:00,EpochTimeScale=TDB,R0=1. ,A1=0.,A2=-1.061003558789E-14,A3=0. ,ALN=1.,NM=2.,NN=0.,NK=0.,AMRAT=0. EARTH WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP 1682617430322 Using ephemeris for target 17292-01-DIDYMOS ephemeris data for target 17292-01-DIDYMOS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1674147161000 157.17884013604618 (Tic-Visit :proposal-id 17292 :visit-id "01" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 196080 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 1808 :al-overhead-at-end 0 :internal-dur-at-end 251 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617431343 Using ephemeris for target 17292-02-DIDYMOS ephemeris data for target 17292-02-DIDYMOS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. Originally had timing requirement of AFTER 1 BY 18 to 24 Days. 1675933578000 110.61610183471021 (Tic-Visit :proposal-id 17292 :visit-id "02" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 720304 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2380 :al-overhead-at-end 0 :internal-dur-at-end 434 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617432304 Using ephemeris for target 17292-03-DIDYMOS-UPDATE ephemeris data for target 17292-03-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1677651907000 110.24295471762571 (Tic-Visit :proposal-id 17292 :visit-id "03" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1448336 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2385 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617433028 Using ephemeris for target 17292-04-DIDYMOS-UPDATE ephemeris data for target 17292-04-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1679565017000 118.5985577001477 (Tic-Visit :proposal-id 17292 :visit-id "04" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1448336 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2385 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617433621 Using ephemeris for target 17292-05-DIDYMOS-UPDATE ephemeris data for target 17292-05-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 Timing link suitability includes constraints ([15 After 05 by 0.1 to 1.0 days]) The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1681414124000 121.96434382306347 (Tic-Visit :proposal-id 17292 :visit-id "05" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "05" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617434188 Using ephemeris for target 17292-15-DIDYMOS-UPDATE ephemeris data for target 17292-15-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 Timing link suitability includes constraints ([15 After 05 by 0.1 to 1.0 days]) The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. HOPR 92444 to replace visit 2. To be scheduled with visit 05 to boost the SNR due to the faintness of the tail. This visit should be executed close to visit 05, but any time within 1 day will be acceptable. 1681419831000 121.87796359374761 (Tic-Visit :proposal-id 17292 :visit-id "15" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "15" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617434743 Using ephemeris for target 17292-06-DIDYMOS-UPDATE ephemeris data for target 17292-06-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1684136606000 109.784547830267 (Tic-Visit :proposal-id 17292 :visit-id "06" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "06" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617435297 Using ephemeris for target 17292-07-DIDYMOS-UPDATE ephemeris data for target 17292-07-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1685962371000 106.55776489919839 (Tic-Visit :proposal-id 17292 :visit-id "07" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "07" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617435863 Using ephemeris for target 17292-08-DIDYMOS-UPDATE ephemeris data for target 17292-08-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1685945256000 106.74712631289128 (Tic-Visit :proposal-id 17292 :visit-id "08" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "08" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617436423 Using ephemeris for target 17292-09-DIDYMOS-UPDATE ephemeris data for target 17292-09-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. 1685956666000 106.54990990963051 (Tic-Visit :proposal-id 17292 :visit-id "09" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "09" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0 1682617436423 copy of visit 09 for HOPR on visit 16 1685950961000 110.4788449505437 (Tic-Visit :proposal-id 17292 :visit-id "09" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "09" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 1 0 1682617436983 Using ephemeris for target 17292-16-DIDYMOS-UPDATE ephemeris data for target 17292-16-DIDYMOS-UPDATE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.353 to 24.182. ephemeris interval: 23.090 to 25.091 The scheduling data was generated by CASM 31.0. CASM was run in Phase II mode. HOPR 92444 to replace visit 2. To be scheduled with visit 06 to boost the SNR due to the faintness of the tail. This visit should be executed close to visit 06, but any time within 1 day will be acceptable. 1684142312000 109.78844218627552 (Tic-Visit :proposal-id 17292 :visit-id "16" :proposal-version -1 :trans-version "20220630" :date "27-Apr-2023 13:43:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17292 :visit-id "16" :obset-id "16" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17292 :visit-id "16" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 1 0