Observatory Focus Monitor

Details Observatory Focus Monitor Observatory Focus Monitor

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9258g&link_type=abstract

HST Proposal ID #9258

Physics

Hst Proposal Id #9258

Scientific paper

The HST focus drifts slowly and shows evidence of undergoing slips of a few microns at random times. The rate of the WFPC2 monitoring program is insufficient to track and/or understand OTA behavior in order to request timely and appropriate Secondary Mirror corrections. This 13 orbit program obtains a large amount of high signal to noise focus data, sometimes in 2 Science Instruments at once, and will be sufficient to more accurately define the HST focus. The utility of STIS image phase retrieval will be thoroughly tested with OII and OIII images acquired in parallel with WFPC2 images.

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