Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acs..rept....3d&link_type=abstract
Instrument Science Report ACS 2008-03, 29 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Acs, Advanced Camera For Surveys
Scientific paper
One of the main advantages of space observatories is the quality and stability of the point spread function that allows programs not feasible from the ground. However, when pushed to the limits, even the Hubble Space Telescope exhibits variations in the PSF that can be problematic for studies like weak lensing or identification of the host halos of bright quasars at high redshift. These variations are primarily due to small displacements in the focus of thetelescope, which to a first approximation can be ascribed to temperature variations. The aim of this report is to characterize the variation of the focus position for HST in terms of the average temperature sensor values of the telescope. We propose a comprehensive temperature-focus model able to predict the position of the focus at the micron level over a dynamic range that extends from sub-orbital variations (< 1 hour) to seasonal and yearly variations. This allows us to predict the focus position significantly more accurately than using interpolation of the monthly direct measurements. Our model is also at least as accurate as the previously proposed breathing model for sub-orbital variations and it is the first one that describes longerterm variations, potentially helping the determination of the model point spread function for observations lacking reference point sources.
Casertano Stefano
di Nino Daiana
Lallo Matt
Makidon Russell B.
Sahu Kailash C.
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