KEYWORDS: Data archive systems, Observatories, Astronomy, Large telescopes, Astronomical telescopes, Telescopes, Databases, Data modeling, Process modeling, Data storage
How do you use modern web technologies to build a user-friendly browser-based data archive? We answer this question for the data archive of the South African Astronomical Observatory (SAAO) and Southern African Large Telescope, which lets users make complex searches, view FITS files and make data requests. The software stack includes React, NodeJS, GraphQL and PostgreSQL. The archive is hosted on virtual Ubuntu servers. The development workflow uses tools like Github Actions, Reviewable and Prettier. The archive forms part of the SAAO's artificial intelligence based approach to observing.
KEYWORDS: Mirrors, Telescopes, Monochromatic aberrations, Image quality, Cameras, Simulation of CCA and DLA aggregates, Image segmentation, Wavefront sensors, Wavefronts, Interfaces
Construction of the Southern African Large Telescope (SALT) was largely completed by the end of 2005 and since then
it has been in intensive commissioning. This has now almost been completed except for the telescope's image quality
which shows optical aberrations, chiefly a focus gradient across the focal plane, along with astigmatism and other less
significant aberrations. This paper describes the optical systems engineering investigation that has been conducted since
early 2006 to diagnose the problem. A rigorous approach has been followed which has entailed breaking down the
system into the major sub-systems and subjecting them to testing on an individual basis. Significant progress has been
achieved with many components of the optical system shown to be operating correctly. The fault has been isolated to a
major optical sub-system. We present the results obtained so far, and discuss what remains to be done.
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