Space Telescope User s Committee

Transcription

1 HST Program Status Presentation to: Space Telescope User s Committee _PMB_STUC.ppt Preston M. Burch Program Manager October 19,

2 2 Topics Program Update Observatory Health SM4 Preparations and Status

3 3 HST Program Status (Since April 13, 2007) HST SM4 launch date moved up one month to August 2008 (was September 10, 2008) Still manifested on OV-104 (Atlantis) SM4 development work on schedule We are now at L minus 10 months HQ Science Mission Directorate reviewed HSTP recommended SM4 manifest content and priorities, directed minor change (FGS) EVA Working Group developed new EVA timeline EVA days 1 and 2 are swapped NOBL 5 removed from timeline Recently conducted NBL 07.3 (6 EVA days of runs), SM4 Crew Familiarization #1, Safety TIM, POWG, Flight Techniques Panel Meeting, Sim #1 (Rendezvous/Capture), Sim #2 (Gyros & Batteries), Sim #3 (WFC3 & Batteries), Sim #4 (COS & ACS-R), and Center Directors Quarterly Review Conducting Mini-POP 08-1 to assess FY09 Budget submission to OMB guidelines for SM4 development and post-sm4 operations Completed recovery from safemode events: Gyro #2 failure on August 31 NICMOS safemode on September 1

4 4

5 5 Major Mission Integration Milestones Preliminary Avionics Review June 28, 2007 Complete Baseline in Flight Definition/Requirement Doc. (FDRD) June 29, 2007 Complete Final Bay IPT Aug 15, 2007 Complete Cargo Integration Review Dry (CIRD)-Run (IPT) Sept 12, 2007 Complete Cargo Integration Review (CIR) Oct 15-19, 2007 Flight Planning/Stowage Review (FPSR) (IPT) Nov 14, 2007 Flight Operations Review (FOR) Feb 25, 2008 Crew Equipment Interface Test (CEIT) May 9, 2008 Bench Review June 26, 2008 Payload Readiness Review (PRR) June 28, 2008 Flight Readiness Review (FRR) July 24, 2008 Payload End-to-End Pad test Aug 1, 2008 Launch Aug 7, 2008

6 6 HST Servicing Mission 4 Planned Mission Manifest and Priorities Manifest in Priority Order 1. RSUs (Gyros) 2. WFC3 3. COS 4. Battery Modules 5. FGS2RR 6. STIS Repair 7. ACS Repair 8. NOBL 8 9. NOBL NOBL 7 Note: SCM and Reboost are parallel activities that do not contend with other EVA tasks and, therefore, do not affect priorities

7 7 SM4 Manifest Rationale RSUs WFC3 COS Batteries FGS2RR STIS Repair ACS Repair NOBL 8 NOBL 5 NOBL 7 SCM Reboost Replaces failed gyros #2, #3 & #5, anomalous gyro #6, high run time gyros #1 and #4 HST s first UV-IR panchromatic wide-field camera and wide-field IR imager; discovery efficiencies 40x over ACS in UV/blue,15-20x over NICMOS in IR Superb point-source, low- and medium-resolution UV spectrograph Current capacity (304 Ah) approximately 58% of nameplate capacity (528 Ah); batteries will be 20 years old at SM4 (5 year on-orbit spec.); present capacity trend is flat Replaces FGS-2R which has degraded star selector encoder LED (predicted unusable in 2011); FGS-3 bearings predicted usable until 2017; operational work-arounds available if only two, or even one, FGS available Restores unique functionality of STIS: Imaging spectroscopy at full angular resolution of HST, high-resolution UV spectroscopy from 115 to 320nm; resolving power as high as 200,000; hightime-resolution (128 µs) UV spectroscopy and imaging, very high S/N visible spectrophotometry Restores unique functionality of ACS CCDs: Unexcelled performance in visible-red, best-ever coronagraph on HST Provides cooling of PSEA that will extend life and allow use of +V3 sunpoint; very limited options for operational management of equipment in Bay 8; pointing restrictions would seriously impact science scheduling Provides cooling of SSRs and MATs that will allow relaxation of roll restrictions and high data volume; more options for operational management of equipment in Bay 5 than Bay 8 Prevents further degradation of MLI from impacting temps of equipment in Bay 7 and adjacent bays Provides cooperative docking system for future spacecraft to increase probability of eventual de-orbit mission success Provides additional margin to science altitude floor

8 8 HST SM4 EVA Timeline For HST Program Planning Development Only Priority Task Times 1. RSUs (3) 3:15 2. WFC3 3:05 3. COS 2:25 4. Battery Modules (2) 1:50 ea 5. FGS 2 3:05 6. STIS Repair 3:15 7. ACS - part I 2:15 - part II 0:30 8. NOBL 8 0:50 9. NOBL 5 0: NOBL SCM 0: Reboost

9 9 HST EVA Days 1 2 Servicing Mission 4 Shortened Mission Scenarios ORU/ORI Change-Out RSUs (2 or more), WFC3, SCM RSUs (2+), WFC3, COS, Batteries (1 module), SCM 3* (1) RSUs (2+), WFC3, COS, Batteries (1 module), ACS Repair, NOBLs (8, 5), SCM 4* 4.5** 5 (2) (1) (2) RSUs (2+), WFC3, COS, Batteries (1 module), STIS Repair, NOBL 8, SCM RSUs (3), WFC3, COS, Batteries (2 modules), ACS Repair, NOBL 8, FGS2, SCM RSUs (3), WFC3, COS, Batteries (2 modules), STIS Repair, NOBLs (8, 5), SCM RSUs (3), WFC3, COS, Batteries (2 modules), ACS Repair, STIS Repair, NOBLs (8, 5), SCM RSUs (3), WFC3, COS, Batteries (2 modules), ACS Repair, STIS Repair, NOBL 8, FGS2, NOBL 5, SCM * Choice between ACS and STIS repair in 3 and 4 EVA scenarios to be made NLT FOR ** 4.5 EVA scenario may be required by OBSS focused inspection

10 10 Shortened Mission Scenarios Planned EVAs Completed (3 RSUs, 1 BMA, SCM) (3 RSUs, WFC3, 2 BMAs, SCM) (3 RSUs, WFC3, COS, 2 BMAs, ACS-R pt. 1, SCM) (3 RSUs, WFC3, COS, 2 BMAs, ACS- R pt. 1, STIS-R, NOBL 8, SCM) 5 Nominal Plan EVAs Remaining RSUs, WFC3, COS, 2 BMAs, (ACS-R & FGS or STIS-R & NOBL 5), NOBLs 8, SCM 2 RSUs, WFC3, COS, 1 BMA, (ACS-R & NOBL 5 or STIS-R), NOBL 8, SCM 2 RSUs, WFC3, COS, 1 BMA, SCM Nominal Plan WFC3, COS, (ACS-R & FGS or STIS-R & NOBL 5), 2nd BMA, NOBL 8 WFC3, COS, ACS-R, NOBL 8 Nominal Plan COS, (ACS-R & FGS or STIS-R & NOBL 5), NOBL 8 Nominal Plan 1 2 RSUs, WFC3, SCM WFC3, 2nd BMA, NOBL 8 COS, NOBLs 8, 5 ACS-R pt. 2, FGS Nominal Plan

11 Equipment Section Degraded MLI: Install NOBLs on Bays 5, 7, 8 in SM4 Fine Guidance Sensors FGS2R: degrading servo LED FGS3: degrading bearings Replace one FGS on SM4 HST Spacecraft Health Primary mirror High gain antenna Secondary mirror Aperture door Aft Shroud Higher power instruments causing warming Axial Scientific Instruments STIS, failed 8/04 STIS Repair on SM4 ACS CCD Imaging failed 1/07 ACS Repair on SM4 Install COS on SM _PMB_STUC.ppt Rate Sensor Units Gyros 2, 3, and 5 failed: replace all 6 gyros on SM4 Radial Scientific Instrument Replace WFPC2 w/ WFC3 on SM4 Solar Arrays Batteries Charge capacity trending downward; replace all 6 batteries on SM4 11

12 12 Run Times of HST Gyros at 9/17/07

13 13 SM4 Flight Crew Scott Altman Greg Johnson Megan McArthur John Grunsfeld Drew Feustel Mike Good Mike Massimino

14 14 HST Servicing Mission 4 (SM4) Configuration Soft Capture Mechanism Cosmic Origins Spectrograph Rate Sensor Units Fine Guidance Sensor IMAX Batteries Wide Field Camera 3 Flight Support System Multi-use Logistic Equipment Carrier Orbital Replacement Unit Carrier Super Lightweight Interchangeable Carrier

15 15 SM4 Flight Hardware Status Cosmic Origins Spectrograph (COS) Completed EMI and VEST testing, metrology verification, SMGT, and ORUC and Hi Fi Mechanical Simulator fit checks Aluminum grating performance issue investigation concluded Wide Field Camera 3 (WFC3) Thermal Vac Test #2 completed UVIS-2 and IR-1 detectors are in WFC3 IR channel thermal instability problem resolved Glinting problem identified on UVIS-2 during T/V #2 Stopped UVIS-1 ATP to address glinting Removed outer (vacuum) housing to install baffle IR-3 detector received at Goddard September 28 IR-4 completing ATP Replacement engineering and flight calibration lamps received and are in testing Calibration system to be removed and modified after EMI testing IR channel throughput performance degradation resolved

16 16 SM4 Flight Hardware Status (cont d) New Batteries at Goddard in cold storage Recent test of flight spare battery shows no sign of degradation New battery procurement at Eagle-Picher terminated Gyros (aka Rate Sensor Units (RSUs); 1 RSU = 2 gyros) RSUs 1005, 1006, and 1007 at GSFC RSU 1004 in development; to be delivered December 2007 Fine Guidance Sensor (FGS) Delivered to Goddard New Outer Blanket Layers (NOBLs 5, 7, and 8) Modifications in work Space Telescope Imaging Spectrograph (STIS) Repair Development work on track

17 17 Overall WFC CEB/LVPS-Replacement Implementation New LVPS module clamps to handrail standoff Cable conducts power and signals between WFC CEB and LVPS New WFC CEB Module is inserted into and clamps to CEB box Cable conducts power between ACS input harness and LVPS

18 Key Products Responsibilities GSFC(441/FSW) Teledyne (ASIC/ Design & Fab) Ball (LVPS-R/ Box Level) GSFC(441/FSW) _PMB_STUC.ppt J&T (CEB-R PWA/ Design, Fab, Assy, Test) Ball (CEB-R Chassis/ Mech. Design and Fab) GSFC (442/I&T) 18

19 Key Demonstrations Provide Design Validation At PDR (June 20-21), we demonstrated a CEB Breadboard that performed all CCD clocking and video processing functions using the SIDECAR ASIC Checks CEB-R to WFC CCD interface A revised version of this breadboard implements the exact flight design to enable detailed performance testing without a full CEB-R At CDR (October 3-4), we demonstrated the Pre-EM hardware that implements all the FPGA and ASIC functions that are seen by the ACS MEB Checks the CEB-R to MEB interface Being used for early FSW development and testing _PMB_STUC.ppt HRC Backpowering Tests demonstrated ability to restore HRC imaging by backpowering the HRC CEB through the flight power harnesses Two tests performed with HRC 2 Flight Spare Detector Detector noise showed no significant differences from nominal performance On-orbit success with HRC remains dependent on condition of on-orbit hardware (possible collateral damage from failures) 19

20 20 -- Backup Charts --

21 Subsystem Science Instruments Color Code G HST Observatory Status Status as of 9/4/07 Last changed 9/4/07 WFPC2 Excellent Summary ACS Redundant electronics failed 1/27/07 SM4 recovery of WFC/HRC pending NICMOS Excellent STIS Failed 8/3/04, SM4 repair pending Changes in Status/Accomplishments/ Life-Extension Measures Highly competitive Cycle 15 and Cycle 16 Science Programs will maintain a 1st rate science program with the remaining SIs ACS SBC science resumed February 20 NICMOS recovered 9/4 from 9/1 safing Electrical Power System Pointing Control System Data Mgmt System G G G Batteries are aging System-level battery charge capacity increased ~ 6 Ahr from 2004 to 2006 SA3 performing very well (~77 of 80 strings) Gyros 1, 6 operating well; Gyro 4 in reserve, and should be used with primary heaters off Gyro 2 failed 8/31/07 FSW compensation of Gyro 6 s bias instability is being recalibrated FGS-1R Excellent FGS-2R Degraded (Anomalous A-Servo LED suspected) FGS-3 Degraded (Bearing performance sub-par; higher torques required) Excellent Software taper charge continues 2006 capacity testing completed 8/25/06 2 additional amps of array output shorted on 8/31/07 Two-Gyro Science Mode ops began 8/29/05 FGS-2R acceleration limit K-factor lowered to ameliorate loss of performance. Effectiveness decreases with servo-loop gain loss; remaining margin uncertain. Periodic tests show that performance is slowly worsening FGS-3 use reduced to preserve bearings Hybrid HST 486/FGE acquisition mode being developed Communications G No performance liens On/off cycles for the Multi-access & S Band Single-access transmitters are accumulating Operations has realized a 38% decrease in SSAT cycles [2044 (7/05-7/06) vs (7/03-7/04)] 1st year of MAT power cycling LEI yielded a 24.7% reduction [7599 (2/06-2/07 vs (2/05-2/06)] Thermal Performance G MLI degradation assumed to be continuing; may accelerate during coming Solar Min Slow warming of aft shroud and equipment bays Tailor attitude and equipment usage as needed Consider conditional limitations on operations in order to retain flexibility Install Bays 8 and 5 NOBLs on SM _PMB_STUC.ppt 21

22 GODDARD SPACE FLIGHT CENTER APPVL RESP P. BURCH MILESTONES J F HUBBLE SPACE TELESCOPE SM4 MASTER SCHEDULE M A M J 2006 J A S O N D J F M A M J 2007 J A S O N BASELINE AS OF 08/10/07 LAST SCHED CHG 10/04/07 STATUS AS OF 09/30/ D J F M A M J J A S O N PROGRAM MILESTONES FLIGHT INSTRUMENTS LAUNCH PROJECT SHUTTLE COSMIC ORIGINS SPECTROGRAPH (COS) WIDE-FIELD CAMERA 3 (WFC3) - ACS REPAIRS - STIS ORBITAL REPLACEMENT UNITS (ORU's) (TO GSFC I&T) SPACE SUPPORT EQUIPMENT (SSE) OPS & GND SYSTEMS DEVELOPMENT ALIVENESS FUNC TEST FUNC TEST RAAS/HOMS DELV IR2@ BALL RSU 1007 HP PALLET TO GSFC FUNC TEST DEINTEG COMPLT BATTs MSO PRE ENV'T FUNC SSE CDR IR2@ GSFC CREW ASSIGN PERR T/VAC COMPL PER-2 RSU 1006 CDR/ TRR RE-INTEG COMPLT DEL TO SYS I&T ACOUSTIC TEST FGS SLIC STRENGTH TEST RSU 1005 CIR EMI/ EMC#1 T/V CALIB TEST#2 SRR PDR PER LVPS DELV PDR RSU 1007 CDR SLIC PER LVPS DELV INSTALL FLT DETECT RSU 1004 CVR DEL FOR COS ACOUSTIC EMI/ EMC#2 CEB-R DELV ACS-R SLIC ACSTC T/V CALIB TEST#3 PER PSR IMAX DEL TO CARRIER MULE ORUC ACSTC ACSTC FSS ACSTC PRR GSFC FRR SHIP TO KSC SHIP TO KSC SHIP TO KSC LAUNCH KSC FRR SMOV 2/09 7 GROUND SYSTEMS - OPS SYS DEV SR-3.1 SR-3.2 SR-2.1 SR-4.1 SR-4.2 GND SYS FREEZE 8 - CTL CTR SYS ARCHIVE 1.0 ARCHIVE GSRR GND SYS FREEZE 9 FLIGHT SYSTEMS - HST 486 FLT SW 486/3.1A /R1 486/R2 486/R3 486/R4 1 GYRO S/W FREEZE 10 - NSSC-1 FLT SW 8.4 QUEEN V QUEEN V5.1 S/W FREEZE 11 SYSTEM TESTING & TRAINING START SMGTs START JSC TESTING START KSC TESTING COMPL SMGTs COMPL ETEs 12 MISSION MANAGEMENT/EVA VERIF. PIP SUBMIT PIP/ ICD/ BL BL PH-2 FLT SAF REV GSFC SIMS PH-2 GND PH-3 FLT SAF REV SAF REV PH-3 GND SAF REV JISs COMPL JISs 13 EVA SYSTEMS & CREW TRAINING NBL 06.1 NBL 06.2 NBL 06.3 NBL 07.1 NBL 07.2 NBL 07.3 NBL NBL NBL NBL NBL NBL NBL NBL NBL NBL 08.7 EVA VERIF COMPLETE 14 MISSION H/W INTEG & GSFC CF#1 CF#2 CF#3 CF#4 CF#5 DELIV TO KSC COMPL 15 KSC PRE LAUNCH/LAUNCH OPS LAUNCH OPS NOTES: CRITICAL PATH Line 2 - WFC3 T/V CALIB TEST #2 and EMI/EMC #1 moved one to two months to the right. SCR pending Line 3 - STIS REPAIR LVPS DELV moved two months to the right. SCR pending (LAUNCH DATE 08/07/08) _PMB_STUC.ppt

23 23

24 24 WFC3 and gyros Summary of SM4 Work Remaining (Major Work Elements) Soft Capture and Rendezvous System STIS replacement hardware, repair tools, and techniques Shuttle/payload analytical and physical integration Flight hardware environmental test Ground system and flight software changes Mission operations plans and procedures Mission level integration and test Includes end-to-end system verification/validation Simulations and Training Payload processing (KSC) Launch and mission execution Post flight de-integration Servicing mission observatory verification

25 25 ACS Failure History Side 1 failure on June 19, 2006 LVPS1 failure left CEB inoperable from Side 1 Most likely cause of ACS failure resides within LVPS1 Board #3, component U2-7, MFL2815D Interpoint DC-DC converter Next most likely cause is short to ground in +35V step-up transformer T6 on same LVPS board Side 2 failure on January 27, 2007 ACS PDU Side 2 fuse is open Failure most likely in LVPS2 Hold section electronics Specific component failure likely will remain unknown MEB1 / LVPS2 CEB APB MEB2 / LVPS1

26 26 ACS Worksite Accessibility and Access Panel Locations Thermal Saddle (Heat Pipes Inside) ACS Mockup WFC CEB Inside HRC CEB Inside CEB MEB1 / LVPS2 Vicinity of TPS APB MEB1 / LVPS2 Inside Possible ESM Interference For Panel Removal MEB2 / LVPS1 ESM +V1

27 27 ACS Present Configuration Current State of ACS (post Bus C Test)

28 28 Concept for ACS Repair (Not yet Approved by NASA Headquarters) Repaired State Simplified Electrical Block Diagram New Power Supply PDU 20 Amp Fuse PDU 20 Amp Fuse Side 1 WFC CEB Side 2 WFC CCD HOLD Bus APB HRC CEB HRC CCD APB HOLD Bus LVPS H , -15, , -15, LVPS H OPERATE Bus LVPS O Failed Element LVPS O OPERATE Bus MEB Suspect Element MEB New Element Side 1 used to operate the entire instrument except for the CEBs which are replaced/powered by a new box Side 2 is inoperable

29 29 Concept for ACS Repair (Not yet Approved by NASA Headquarters) ACS Repair Architecture - Replace CEB Cards CEB Replacement Module Power Supply Module