Space Telescope Science Institute
Cycle 20 Phase II Proposal Instructions
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HST Phase II Proposal Instructions for Cycle 20 > Chapter 1: About This Document > 1.4 Technical Content

1.4 Technical Content
Available Science Instruments for Cycle 20
ACS/WFC, ACS/SBC, COS, WFC3, STIS and FGS are available for this cycle.
Instrument Modes, Special Requirements, etc.
Some changes have been made to these Instructions since the previous version to correct errors and omissions, and to document new modes or options. There are too many to list, but as long as you use the most recent version the information provided should reflect our current state of knowledge.

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