24-Jun-2008K. Sembach 1 What’s Happening During Hubble Servicing Mission 4? Ken Sembach STScI...
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Transcript of 24-Jun-2008K. Sembach 1 What’s Happening During Hubble Servicing Mission 4? Ken Sembach STScI...
24-Jun-2008 K. Sembach 1
What’s Happening During Hubble Servicing Mission 4?
Ken SembachSTScI Hubble Project Scientist
24-Jun-2008 K. Sembach 2
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.
WFPC1 WFPC2
24-Jun-2008 K. Sembach 3
Hubble Servicing Mission 4
• 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)
• Scheduled for October 8, 2008 on Space Shuttle Atlantis (STS-125)
Key Elements
24-Jun-2008 K. Sembach 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
24-Jun-2008 K. Sembach 5
• End-to-end measurements demonstrate the dramatic near-ultraviolet and near-infrared advantages of WFC3 over other instruments
WFC3: The Next Step in HST Imagers
May 2008
24-Jun-2008 K. Sembach 6
WFC3 Configuration
B-Latch
24-Jun-2008 K. Sembach 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)?
24-Jun-2008 K. Sembach 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.
24-Jun-2008 K. Sembach 9
COS Benchand
Optical Layout
Main Electronics Box Remote InterfaceUnit
FUV DetectorElectronics Box
Aperture Mechanism
Optics Select Mechanism–1
Optics Select Mechanism–2
FUV Detector1150-1775A
Cal Platform
NUV Detector1750-3200A
FUV MCP Detector
NUV MAMA Detector
Calibration Platform
OSM-1
OSM-2
NUV Collimator
NUV CameraMirrors (3)
ApertureMechanism
24-Jun-2008 K. Sembach 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)?
COS Spectroscopy of the Cosmic Web
COS will greatly increase the number of quasar sight lines explored by Hubble.
Cosmic web absorption features
In just a few days, COS can sample as much of the Universe as all existing STIS observations of quasars have probed!
24-Jun-2008 K. Sembach 12
COS Will Explore Galactic OutflowsCOS Will Explore Galactic Outflows
Galaxies power strong winds that blow dust, gas, and heavy elements into the Galaxies power strong winds that blow dust, gas, and heavy elements into the intergalactic medium.intergalactic medium.
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
M82
24-Jun-2008 K. Sembach 13
EVA Timeline
STS-125 CrewMegan 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)
24-Jun-2008 K. Sembach 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)
24-Jun-2008 K. Sembach 15
Axial Bay Instrument Replacement
Faint Object Camera removal during SM3B(Bay 3, -V2: Currently contains ACS)
COSTAR installation during SM1(Bay 4, -V2)
24-Jun-2008 K. Sembach 16
24-Jun-2008 K. Sembach 17
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)
BMA (SN 1033)(with lid removed)
Battery Isolation Switch
24-Jun-2008 K. Sembach 18
New Outer Blanket Layers (NOBLs)• Multi-layer insulation (MLI) protects HubbleMulti-layer insulation (MLI) protects Hubble
• Thermal control of critical Equipment Bays Thermal control of critical Equipment Bays • Degrading from environmental exposureDegrading from environmental exposure
• NOBLsNOBLs• Stainless steel panels with MLIStainless steel panels with MLI• NOBLs already installed on Bays 1, 6, 9, and 10 NOBLs already installed on Bays 1, 6, 9, and 10 • NOBLs 8, 5, and 7 (#8 currently on EVA day 4)NOBLs 8, 5, and 7 (#8 currently on EVA day 4)
+V3 Light Shield and SM2 installed patches+V3 Light Shield and SM2 installed patches
Bay 6, before and after Bay 6, before and after NOBL installationNOBL installation
SM1 SM2 SM3B
24-Jun-2008 K. Sembach 19
NOBLs for Equipment Bays 5, 7, and 8
Bay 5
Bay 7 Bay 8
Bay5Bay5TransmittersTransmitters
Solid State RecordersSolid State Recorders
Bay 7Bay 7Various electronicsVarious electronics
Bay 8Bay 8Safing electonicsSafing electonics
Science tape recorderScience tape recorderRetrieval mode gyrosRetrieval mode gyros
24-Jun-2008 K. Sembach 20
24-Jun-2008 K. Sembach 21
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
MEB-1Cover
EVA Handle
LVPS-2
MEB1 with cover removed MEB1 with cover removed
24-Jun-2008 K. Sembach 22
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!
CMT
CEITCTE
Replacement Cover
FCP
24-Jun-2008 K. Sembach 23
ACS Instrument Repair• CCD Electronics Box (CEB) access
• Cut EMI screen• 32 fasteners• Remove cover• Extract 4 cards
MEB1 /LVPS2Inside Possible ESM
Interference For Panel Removal
WFC CEB Inside
ESM
ACS Mockup
HRC CEB Inside
Power Connector
24-Jun-2008 K. Sembach 24
ACS FCP and Screen Cutter
Fastener Capture Plate (FCP)Fastener Capture Plate (FCP)
EMI Screen CutterEMI Screen Cutter
24-Jun-2008 K. Sembach 25
ACS Instrument Repair• Install CEB-R and LVPS-R New
WFCCEB-R
HRCCEB
(unaltered)
New LVPS-R
Power Output Element (POE)
Power Input Element (PIE)
ACS inputpower socket
Connection to HST power
24-Jun-2008 K. Sembach 26
It takes thousands of people across this country It takes thousands of people across this country to make a Hubble Servicing Mission successful! to make a Hubble Servicing Mission successful!