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The Long Range Plan: Cycle 16 update
Dave Adler – TIPSSeptember 2007
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Outline
Current Cycle 16 LRP vs the Initial LRP Impact of the Sept 1 safing Cycle 16 tail WFPC2 past SM4 Cycle 17 Post-SM4 testing
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The Initial Cycle 16 LRPReleased 07.178 (6/27/07) – for the 07190 SMS 4498 total orbits
Prime Instrument:*WFPC: 2292 orbitsNIC: 1563 orbitsACS: 608 orbits (1)
FGS: 216 orbits* - some visits have more than one instrument prime.(1) – 23 orbits HRC/WFC prime not yet converted
Breakdown by cycle:Cycle 16: 3037 orbitsCycle 15: 1402 orbitsCycle 14: 59 orbits
Not in the LRP:ToOs ~50 orbitsCycle 16 cals: ~ 100 orbitsHOPRs (2.5%) ~100 orbits
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The Current LRP07253A - visits scheduled through 07.267
(9/23/07) 3764 total orbits
Prime Instrument:*WFPC: 1752 orbitsNIC: 1455 orbitsACS: 522 orbits (1)
FGS: 193 orbits* - some visits have more than one instrument prime.(1) – 4 orbits HRC/WFC prime not yet converted
Breakdown by cycle:Cycle 16: 2773 orbitsCycle 15: 947 orbitsCycle 14: 44 orbits
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Cycle 16 LRP - progress
LRP built
Complete
through
Total orbits
Through
08.220
08.220 – 08.255
08.255 – 09.068
Jul 13 07.203 4470 3375 349 746
Aug 16
07.238 4052 3040 277 735
Sep 10
07.267 3764 2793 236 735
SM4
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Recent calendars
07239: pre-safing: 75 orbits post-safing: 50 orbits 07246: pre-safing: 86 orbits post-safing: 66 orbits 07253: 88 orbits 50% efficiency 07260: 91 orbits 54% efficiency 07267: 81 orbits 46% efficiency
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Current LRP – full through SM4
SAA-free demanders vs SAA-hiders
Total orbits SAA-free demanders SAA-hiders /per day /per day /per day -------------- ------------------------- ------------- Cycle 16: ~2779/ 8.7 1477/ 4.6 1302/ 4.1(07.267-08.220) Cycle 16 tail: ~877/ 4.1 564/ 2.6 313/ 1.5(08.220-09.068)
We allocate two orbits/day for “unplanned” visits. 8.7 + 2 = 10.7 orbits/day = 75 orbits/week. Slightly more than 2-Gyro average – Cycle 16 is full
through SM4.
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LRP example – hiders, free-demanders
SAA-free demander
SAA hider
Partial SAA hider
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Current LRP – hiders vs free demanders
total orbits
SAA-free demanders
SAA-hiders
SM4 8/7/08
Cycle 16 (nominal) Cycle 16 tail
SAA-free subscription
is low
SAA-hidingsubscription
is full
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Plan Flexibility: hiders vs free-demandersPrevious Cycles: majority of programs were SAA-free demanders
(which can’t go in SAA-impacted orbits). fewer SAA-hiders (schedule in SAA-impacted
orbits).
Cycle 16: Instrument compliment in Cycle 16 – higher
percentage of visits are SAA-hiders.
Since SAA-hiders can schedule in SAA-free orbits, Cycle 16 has more scheduling flexibility.
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Current plan – northpoint weeks
Weekly subscription depends on timing of northpoint
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2-Gyro orbit counts2-gyro average – 73.5 orbits/week3-gyro average (Cycles 12/13) – 81 orb/week
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Impact of the recent safing
Gyro failure at 243:23. Science recovery at 246:00; 25 orbits “lost.”
NIC safing at 245:02. NIC science pulled off the 07246 SMS; net
“loss” of 20 orbits. No science visits lost.
all 45 orbits were rescheduled on the 07246, 07253, and 07260 SMSes, or replanned for the next few weeks.
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Cycle 16 tail
The LRP > 08.255 (9/10/08: original SM4 date)
No Cycle 15 (or earlier) programs No ACS contingency programs No WFPC2 prime programs Only one WFPC2 parallel program – 75 orbits –
can’t move earlier without oversubscribing other regions.
Some programs can be pulled forward if subscription in the target region is low (i.e., “unplanned” visits haven’t used it) and the program constraints allow it.
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WFPC2 beyond SM4 One Cycle 15/ACS contingency program visit (2
orb) has moved passed SM4 due to guide star problems.
With Neill Reid and Ken Sembach, used the following criteria to decide which WFPC2 to move forward:
Programs that will be less than 10% complete at SM4: leave post-SM4 visits alone; they will be converted to WFC3.
Programs greater than 90% complete at SM4: leave post-SM4 orbits alone; program will be considered
complete. PI can appeal for reinstatement of orbits to TTRB.
Programs between 10-90% complete at SM4: move forward if possible.
Moved 36 orbits forward; 132 orbits from 11 programs remain.
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Cycle 16: End of Cycle Details• Instrument breakdown:
Instrument (prime) Orbits* (08.220-08.255)
Orbits* (> 08.255)
FGS 6 19
ACS/SBC 35 243
WFPC2 132 0
NICMOS 82 474
Total 231 (1) 736
Notes:* programs with plan windows ending in the specified region.(1) 24 orbits have both WFPC and SBC prime.
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Cycle 16: End of Cycle Details• Large Programs:
Program/PI orbits allocate
d
completed/
scheduled
08.220 -
08.255
> 08.255
11120 - Wang 144 0 0 0
11142 - Yan 150 0 34 75
11149 - Egami 72 0 0 62
11178 - Grundy 128 50 1 0
11202 - Koopmans
159 10 3 32
11210 - Benedict 63 10 1 0
11211 - Benedict 67 9 3 2
11236 - Teplitz 117 0 0 74
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Cycle 17 Post-SM4 testingGoal: Demonstrate that the ground
system functions on a representative sample of post-SM4 HST proposals in 3-Gyro mode:
Proposal creation Proposal implementation Long Range Plan generation Weekly science schedule generation SMS generation Mission Schedule/Command Load generation
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Cycle 17 Post-SM4 testing: LRP 3-Gyro OBAD mode 830 external orbits:
220 COS 375 WFC3 225 NIC, ACS, STIS, FGS
Restricted to 07.260-07.330 – most visits schedulable over full time frame.
Artificially restricted Plan Windows to provide a good mix of visits for each test calendar.
Result: Spike worked fine. Distribution of SAA-hiders and free-demanders is representative of a typical operational LRP.
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Cycle 17 Post-SM4 testing: Scheduling
Added science visits to a candidate list, scheduled them.
Scheduled snaps using the normal process. Scheduled parallel observations. Selected guide stars. Ran “non-continuity” (stand-alone) Science
Mission Specifications (SMS).
Results: Calendars with 80-90 orbits/week. SPSS and SMS generation worked fine; no functional issues identified in these systems with new instruments.
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Cycle 17 Post-SM4 testing: Upcoming work
Generate LRP reports Pending ASSIST DB updates.
Build “non-continuity” schedules, SMSes for the remainder of the weeks in the DRM LRP.
Generate Mission Schedules/Command Loads Report “final” status at DRM Working Group
meeting on October 17 Report identified problems/liens Determine need for additional exercises