Space Telescope Science Institute TOGGLE SEARCH SEARCH MENU Main Navigation HST REPAIR CONTINGENCY PLANS HST Home About Proposing Observing Instrumentation Documentation News & Events Breadcrumbs Navigation Home Hubble Space Telescope About Space Telescope Users Committee SM4 STIS & ACS Repair Contingency Plans At the April 2007 Space Telescope Users Committee meeting, NASA Headquarters formally asked the STUC to provide input on the relative scientific priorities that should be assigned to the tasks of repairing STIS and ACS during Servicing Mission 4. This judgement will serve as one component in determining the overall relative priorities of the repair activities. The STUC's assessment was to be made under the assumption that both COS and WFC3 are installed and fully operational, and that vital space craft maintenance and safety related activities have been completed successfully. The STUC agreed to provide a recommendation by May 15th. They consulted with the HST User Community on this issue, soliciting responses to the following question: Based on scientific considerations, which instrument, ACS or STIS, should have the higher priority for repair? The STUC asked that interested parties submit brief comments describing the scientific rationale for their preference. The closing date for those comments, which were sent directly to the STUC via a dedicated e-mail address set up at OCIW, was 14 May 2007. A total of ~50 responses were received. The STUC made a formal response to the HST Project and the STScI Director on May 15 2007. The main points are summarised as follows: There is strong scientific support in the community for repairs to both instruments. There was a modest majority in favour of STIS among the members of the community who replied to the STUC request for input. The STUC themselves had a slight majority in favour of ACS, but recognised that other considerations (technical, scheduling, cost) may play a greater role in deciding the priorities in the final EVA schedule. The full recommendations are given in the STUC's letter (attached in pdf format). It should be emphasized that the response will serve primarily as an aid in contingency planning. In support of the STUC's activity, STScI is providing this web page, which collects information on the technical capabilities of the four instruments: ACS, COS, STIS and WFC3. Reference Documents Overview Overview of HST Instruments post SM4 ACS technical capabilities ACS 2-page summary ACS Instrument Handbook COS technical capabilities COS 2-page summary COS Mini Handbook STIS technical capabilities STIS 2-page summary STIS Instrument Handbook WFC3 technical capabilities WFC3 2-page summary WFC3 Mini Handbook Please Contact the HST Help Desk with any Questions https://hsthelp.stsci.edu Follow HST on: Link totwitter Link tofacebook Link toflickr Link toyoutube Back to top Footer STScI Secondary Navigation Who We Are Webcasts MAST News Center MyST Contact Us Opportunities Events Follow us on our social media channels. Link tofacebook Link totwitter Link toinstagram Link toyoutube Utility Navigation Sitemap Copyright Privacy