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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?

Ken Sembach

STScI Hubble Project Scientist



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.

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)

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

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


WFC3 Configuration

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)?

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.

FUV Detector

Electronics Box

Cal Platform

Main Electronics Box

Remote Interface


FUV Detector


NUV Detector


Optics Select Mechanism–1

Optics Select Mechanism–2

Aperture Mechanism

Calibration Platform

NUV MAMA Detector

NUV Camera

Mirrors (3)




NUV Collimator




COS Benchand Optical Layout

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)?

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!

COS Will Explore Galactic Outflows


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.

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)

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)

Axial Bay Instrument Replacement

COSTAR installation during SM1

(Bay 4, -V2)

Faint Object Camera removal during SM3B

(Bay 3, -V2: Currently contains ACS)

BMA (SN 1033)

(with lid removed)

Battery Isolation


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)

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)




Bay 6, before and after NOBL installation

+V3 Light Shield and SM2 installed patches

NOBLs for Equipment Bays 5, 7, and 8



Solid State Recorders

Bay 7

Various electronics

Bay 8

Safing electonics

Science tape recorder

Retrieval mode gyros

Bay 5

Bay 7

Bay 8


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



MEB1 with cover removed





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!

WFC CEB Inside

ACS Mockup

HRC CEB Inside

Power Connector

MEB1 /



Possible ESM Interference For Panel Removal


ACS Instrument Repair

  • CCD Electronics Box (CEB) access

    • Cut EMI screen

    • 32 fasteners

    • Remove cover

    • Extract 4 cards

ACS FCP and Screen Cutter

Fastener Capture Plate (FCP)

EMI Screen Cutter

ACS Instrument Repair

  • Install CEB-R and LVPS-R




Power Output

Element (POE)






Power Input

Element (PIE)

ACS input

power socket

Connection to HST power