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Cycle 17 Planning

Cycle 17 Planning. SM4, New Instruments, New Planning Elements, Changed Constraints, and a Return to 3-Gyros. LRP planning Process Flow. Planning of the different types of visits will proceed logically: GO, Survey, then emplacement of the on-COS parallel programs. Regular GO planning.

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Cycle 17 Planning

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  1. Cycle 17 Planning SM4, New Instruments, New Planning Elements, Changed Constraints, and a Return to 3-Gyros

  2. LRP planning Process Flow • Planning of the different types of visits will proceed logically: GO, Survey, then emplacement of the on-COS parallel programs. Regular GO planning Survey program planning Parallel program planning

  3. Planning Within GO/Survey • Each of the first two categories will be broken down into two separate phases of planning: • North-point • Remainder • The purpose is to maximize utility of the underutilized orbits (which typically are the north-point, SAA-impacted orbits, and in particular the ‘heart’ orbits of the SAA).

  4. Planning Procedure • Definition: ‘Cold’ times: Generally low numbers of visits/targets which will schedule within given orbits. • Identify visits most needed for the ‘coldest’ times. This can be done in different ways • using SPIKE cold-spot tools after visits are planned). • Using the skygrid which identifies raw schedulability.

  5. Key Planning Issues • SM4 Planning • Enabling of specific instrument modes • USC generator scripts must be ready prior to ingest (q.v. wfpc2_uscs_b4_sm4.bash ringworld LRP cron) • Replacement FGS and handling guide star availability. • 2-Gyro --> 3-Gyro planning • How should we go about merging/maintaining an operational 2-Gyro LRP while simultaneously assimilating a 3-Gyro Cycle into the flow? • North-point/SAA-hiding for the new Cycle. • New SPIKE scheduling critic (not yet delivered) for restricting candidate windows. • Reserving the subset of SNAPs which are optimum for use of the North-point times. • Blackout times/angles for Bay 5/8 thermal restrictions? (depends upon result of SM4 achievements) • Power constraints for mid-2009. • New SPIKE constraint implemented with modulated orient table (not delivered yet) (ij 08-04-17 delivered with CASM 17.2 and destined for SPIKE 31.1 • Possible instrument campaigns?

  6. Key Planning Issues (2) • Identification of early-goers (find_mustgo_early.py, et.al.) • Post-LRP-build (?) emplacement of orient restrictions for any parallels (on top of COS). • Better analysis of the distribution of NICMOS and WF3/IR faint-target observations to ensure balanced SAA-hiding distribution (may not be feasible) • Change in the modulation amplitude and phase for North-point occurrences in SPIKE. • If any Survey programs are accepted, management of the proposal windows and visits is needed.

  7. LRP Planning Software Issues • Multiple scenarios for LRP build. • Metrics for deciding which LRP is superior. • Advanced target RA distribution analysis. • SPIKE hot/cold-spot analysis tools. • Apply these to both the GO pool and the Surveys • Tools to subselect and manage Survey proposals. • In Cycle 14 at the 3-->2 Gyro transition, a special procedure was required for merging the Cycle LRPs. This must be resurrected, revamped, or rewritten with modifications to handle the return to 3-Gyros.

  8. Merging 2- & 3-Gyro LRPs • In the Cycle 14 build (at the end of Cycle 13), a separate 2-Gyro constraint LRP was created and maintained with a nightly process. • Planning the ‘new cycle’ was handled with resource cut-outs and a separate set of constraints. • The 2-Gyro LRP was then merged in with the operational 3-Gyro LRP to yield the operational released LRP. • In effect, the upcoming 2-Gyro LRP was a subset of the old 3-Gyro LRP. Both could be handled within a 3-Gyro SPIKE image post-facto. • With the current and upcoming Cycle, doing the same could be similar but with a twist: • Merging a 3-Gyro LRP with a 2-Gyro LRP might be handled similarly, however, the directionality is reversed. • In planning the Cycle 17 visits, resource cut-outs from the Cycle 16- visits could be implemented (new software is needed to do this properly and not the way it was done in Cycle 14).

  9. Cycle 17 Early-Goers • Visits from the Cycle 17 pool that can execute prior to SM4 fall into 2-categories: • Singletons • Singleton visits from the current instrument suite can easily be planned to execute prior to SM4. • However, allowing planning of large numbers of these prior to the LRP build could skew the build distribution. • Linksets • These may be problematic if they have reduced 2-Gyro constraint windows for planning. Large numbers planned prior to Cycle 17 LRP build should be avoided.

  10. New/Resurrected Instruments • New Science Instruments: • COS: • A MAMA (FUV) • NUV Channel • WFC3: • IR • UVIS • Resurrected Science Instruments: • STIS: • FUV & NUV MAMAs • CCD • ACS: • WFC • HRC • Also to be installed: • FGS2: • NOBL (Bay 8) • New RSUs (back to 3 gyro ops) • New Batteries (possible new reconditioning exercises. • Also Possible: • NOBL (Bay 5)

  11. A New FGS • The new FGS will not be available for guiding for a specified period of time (needs quantification). • Incoming visits will need to be planned so as not to use this FGS post-SM4 until the expected recommisioning date. • New FGSs were accommodated after SM2 (Cycle 7) and SM3A (1999). Procedures need to be identified for handling the visit planning taking the lessons from these installations into account.

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