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Main Authors: Berkefeld, Thomas, Bell, Alexander, Volkmer, Reiner, Heidecke, Frank, Preis, Tobias, Sonner, Thomas, Nakai, Eiji, Korpi-Lagg, Andreas, Gandorfer, Achim, Solanki, Sami K., Iniesta, Jose Carlos del Toro, Katsukawa, Yukio, Bernasconi, Pietro, Feller, Alex, Riethmüller, Tino L., Álvarez-Herrero, Alberto, Kubo, Masahito, Pillet, Valentín Martínez, Smitha, H. N., Suárez, David Orozco, Grauf, Bianca, Carpenter, Michael
Format: Preprint
Published: 2026
Subjects:
Instrumentation and Methods for Astrophysics
Solar and Stellar Astrophysics
Online Access:https://arxiv.org/abs/2602.07448
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Table of Contents:
  • This paper describes the wave-front correction and image stabilisation system (CWS) developed for the Sunrise III balloon-borne telescope, and provides information about its performance as measured during the integration into the telescope and during the 2024 science flight. The fast image stabilisation is done by a correlation tracker (CT) and a fast tip-tilt mirror, low order aberrations such as defocus and coma are measured by a six-element Shack-Hartmann wavefront sensor (WFS) and corrected by an active telescope secondary mirror for automated focus and manual coma correction. The CWS is specified to deliver a stabilised image with a precision of 0.005 arcsec (rms). The autofocus adjustment is specified to maintain a focus stability of 0.01 waves in the focal plane of the CWS.

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