NICMOS Breathing and Focus Field Variations

Details NICMOS Breathing and Focus Field Variations NICMOS Breathing and Focus Field Variations

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nicm.rept....8w&link_type=abstract

Instrument Science Report NICMOS 2009 - 008, 14 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

The focus of the NICMOS cameras is monitored on a regular basis. In order to achieve consistency in the focus determination, several effects have to be taken into consideration. The main ones affecting NICMOS are: (1) thermally induced movement of the secondary mirror (a.k.a. breathing), and (2) a curved focal plane for all three cameras. The latter is known as NICMOS Focus Field Variation and affects both the measurement of the focus and gives a position dependent Point Spread Function. In this Instrument Science Report we discuss the breathing corrections in the context of the NICMOS Focus Monitoring Program, and re-measure the Focus Field Variations.

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