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What’s Happening During Hubble Servicing Mission 4?

What’s Happening During Hubble Servicing Mission 4?. Ken Sembach STScI Hubble Project Scientist. WFPC1. WFPC2. Hubble Has Improved Over Time. Servicing missions have improved Hubble’s vision…. Hubble sees farther and with greater clarity than any ground-based optical telescope.

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What’s Happening During Hubble Servicing Mission 4?

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  1. What’s Happening During Hubble Servicing Mission 4? Ken Sembach STScI Hubble Project Scientist

  2. WFPC1 WFPC2 Hubble Has Improved Over Time • Servicing missions have improved Hubble’s vision… • Hubble sees farther and with greater clarity than any ground-based optical telescope • Hubble will be even more powerful after SM4.

  3. Hubble Servicing Mission 4 • Scheduled for October 8, 2008 on Space Shuttle Atlantis (STS-125) Key Elements • Two new science instruments • Wide Field Camera 3 (WFC3) and the Cosmic Origins Spectrograph (COS) • Replacement of batteries (needed for power during orbital night) • Replacement of gyros (used to determine HST pointing) • Replacement of one of the three Fine Guidance Sensors (FGS) • Repair of the Space Telescope Imaging Spectrograph (STIS) • Repair of the Advanced Camera for Surveys (ACS) • Replacement of thermal blankets (used to maintain temperature)

  4. New Hubble Science Instruments • Wide Field Camera 3 (Panchromatic Imaging) • Two channels cover near-ultraviolet to near-infrared wavelengths • Wide field imaging from 200 to 1700 nm • Greater sensitivity, wider field of view • Replaces WFPC2 during SM4 • Cosmic Origins Spectrograph (Ultraviolet Spectroscopy) • Far-ultraviolet channel (110 nm - 180 nm) • Improves HST sensitivity by at least 10x • Near-ultraviolet channel (180 nm - 320 nm) • Replaces COSTAR during SM4

  5. May 2008 WFC3: The Next Step in HST Imagers • End-to-end measurements demonstrate the dramatic near-ultraviolet and near-infrared advantages of WFC3 over other instruments

  6. B-Latch WFC3 Configuration

  7. WFC3 Science Themes What are dark energy and dark matter? How and when did galaxies first assemble? How universal are the processes of star formation in galaxies? How do stars evolve, and what is their distribution of masses? How does star-formation and planetary disk formation depend on environmental conditions? What is the composition of planets, comets, and minor planets in our Solar System (and beyond)?

  8. WFC3 Panchromatic Imaging of Star-Forming Regions • Ultraviolet observations reveal young stars that are flooding their surroundings with intense ultraviolet light. • Infrared observations penetrate deeper into regions heavily obscured by dust.

  9. FUV Detector Electronics Box Cal Platform Main Electronics Box Remote Interface Unit FUV Detector 1150-1775A NUV Detector 1750-3200A Optics Select Mechanism–1 Optics Select Mechanism–2 Aperture Mechanism Calibration Platform NUV MAMA Detector NUV Camera Mirrors (3) OSM-2 FUV MCP Detector NUV Collimator OSM-1 Aperture Mechanism COS Benchand Optical Layout

  10. COS Science Themes What is the large-scale structure of matter in the Universe? How did galaxies form out of the intergalactic medium? What types of galactic halos and outflowing winds do star-forming galaxies produce? How were the chemical elements for life created in massive stars and supernovae? How do stars and planetary systems form from dust grains in molecular clouds? What is the composition of planetary atmospheres and comets in our Solar System (and beyond)?

  11. Cosmic web absorption features COS Spectroscopy of the Cosmic Web COS will greatly increase the number of quasar sight lines explored by Hubble. In just a few days, COS can sample as much of the Universe as all existing STIS observations of quasars have probed!

  12. COS Will Explore Galactic Outflows M82 Credit: X-ray: NASA / CXC / JHU / D.Strickland; Optical: NASA / ESA / STScI / AURA / The Hubble Heritage Team; IR: NASA / JPL-Caltech / Univ. of AZ /C. Engelbracht Galaxies power strong winds that blow dust, gas, and heavy elements into the intergalactic medium.

  13. EVA Timeline STS-125 Crew Megan McArthur (Mission Specialist) Michael Good (Mission Specialist) Gregory Johnson (Pilot) Scott Altman (Commander) John Grunsfeld (Mission Specialist) Michael Massimino (Mission Specialist) Andrew Feustel (Mission Specialist)

  14. Radial Bay Instrument Replacement The new Wide Field Camera 3 (WFC3) will replace the existing Wide Field Planetary Camera 2 (WFPC2). WFPC1 removal during SM1 (December 1993)

  15. Axial Bay Instrument Replacement COSTAR installation during SM1 (Bay 4, -V2) Faint Object Camera removal during SM3B (Bay 3, -V2: Currently contains ACS)

  16. BMA (SN 1033) (with lid removed) Battery Isolation Switch Battery Replacement • 2 NiH2 Battery Modules • 3 batteries per module • 22 cells per battery • Batteries now on Hubble are originals Original BMA installed in HST Bay 2 (second BMA is in Bay 3)

  17. New Outer Blanket Layers (NOBLs) • Multi-layer insulation (MLI) protects Hubble • Thermal control of critical Equipment Bays • Degrading from environmental exposure • NOBLs • Stainless steel panels with MLI • NOBLs already installed on Bays 1, 6, 9, and 10 • NOBLs 8, 5, and 7 (#8 currently on EVA day 4) SM1 SM2 SM3B Bay 6, before and after NOBL installation +V3 Light Shield and SM2 installed patches

  18. NOBLs for Equipment Bays 5, 7, and 8 Bay5 Transmitters Solid State Recorders Bay 7 Various electronics Bay 8 Safing electonics Science tape recorder Retrieval mode gyros Bay 5 Bay 7 Bay 8

  19. LVPS-2 STIS Instrument Repair • Remove EVA handle • Install fastener capture plate • 107 fasteners! • Remove Main Electronics Box (MEB) cover • Extract faulty card • Insert replacement card • Install MEB replacement cover EVA Handle MEB-1 Cover MEB1 with cover removed

  20. CMT FCP CEIT CTE Replacement Cover STIS Repair Tools and Replacement Cover • Fastener Capture Plate (FCP) captures bolts/washers • Card-lok Manipulation Tool (CMT) releases card • Card Extraction/Insertion Tool (CEIT) • Card Transport Enclosure (CTE) • MEB Replacement Cover • No bolts necessary!

  21. WFC CEB Inside ACS Mockup HRC CEB Inside Power Connector MEB1 / LVPS2 Inside Possible ESM Interference For Panel Removal ESM ACS Instrument Repair • CCD Electronics Box (CEB) access • Cut EMI screen • 32 fasteners • Remove cover • Extract 4 cards

  22. ACS FCP and Screen Cutter Fastener Capture Plate (FCP) EMI Screen Cutter

  23. ACS Instrument Repair • Install CEB-R and LVPS-R New WFC CEB-R Power Output Element (POE) New LVPS-R HRC CEB (unaltered) Power Input Element (PIE) ACS input power socket Connection to HST power

  24. It takes thousands of people across this country to make a Hubble Servicing Mission successful!

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