Focus and alignment of the Dark Energy Camera using out-of-focus stars

Aaron Roodman

doi:10.1117/12.926671

24 September 2012 Focus and alignment of the Dark Energy Camera using out-of-focus stars

Aaron Roodman

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84466O (2012) https://doi.org/10.1117/12.926671
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The active optics system of the Dark Energy Camera (DECam) at the CTIO 4 meter Blanco telescope, built for the Dark Energy Survey, uses out-of-focus stars (donuts) to determine the camera's focus and alignment, as well as provide a measure of the wavefront. In this paper, we describe the donut analysis algorithm and present results on focus, alignment, and wavefront from a donut campaign conducted at the Blanco from 2010 to 2012, using the previous wide-field camera.

Citation Download Citation

Aaron Roodman "Focus and alignment of the Dark Energy Camera using out-of-focus stars", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84466O (24 September 2012); https://doi.org/10.1117/12.926671

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