1 The Long Range Plan: Cycle 16 update Dave Adler – TIPS September 2007

1

The Long Range Plan: Cycle 16 update

Dave Adler – TIPSSeptember 2007

TIPS 20 September 2007 2

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


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


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


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


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


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.


LRP example – hiders, free-demanders

SAA-free demander

SAA hider

Partial SAA hider


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


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.


Current plan – northpoint weeks

Weekly subscription depends on timing of northpoint


2-Gyro orbit counts2-gyro average – 73.5 orbits/week3-gyro average (Cycles 12/13) – 81 orb/week


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.


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.


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.


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.


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


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


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.


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.


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

Documents

1 The Long Range Plan: Cycle 16 update Dave Adler – TIPS September 2007