• In-orbit performance of UVIT over the past 5 years

• # Fulltext

https://www.ias.ac.in/article/fulltext/joaa/042/0020

• # Keywords

Space vehicles: AstroSat; telescopes: UVIT; instrumentation: astronomical imaging.

• # Abstract

Over the last 5 years, UVIT has completed observations of more than 500 proposals with $\sim$800 unique pointings. In addition, regular planned monitoring observations have been made and from their analysis various key parameters related to in orbit performance of UVIT have been quantified. The sensitivities of the UV channels have remained steady indicating no effect of potential molecular contamination confirming the adequacy of all the protocols implemented for avoiding contamination. The quality of the PSF through the years confirms adequacy of thermal control measures. The early calibrations obtained during the Performance Verification (PV) phase have been further revised for more subtle effects. These include flat fields and detector distortions with greater precision. The operations of UVIT have also evolved through inorbit experience, e.g. tweaking of operational sequencing, protocol for recovery from bright object detection (BOD) shutdowns, parameters for BOD thresholds, etc. Finally, some effects of charged particle hits on electronics led to optimised strategy for regular resetting. The Near-UV channel was lost in one of suchoperations. All the above in-orbit experiences are presented here.

• # Author Affiliations

1. Tata Institute of Fundamental Research, Mumbai 400 005, India.
2. Indian Institute of Astrophysics, Bangalore 560 034, India.
3. University of Calgary, Calgary, AB, Canada.
4. Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, India.
5. Ludwig Maximilian University of Munich, Munich, Germany.
6. ISRO Headquarters, Bengaluru 560 094, India.
7. National Research Council of Canada, Herzberg Astronomy and Astrophysics, Victoria, Canada.
8. U.R. Rao Satellite Centre, Bengaluru 560 017, India

• # Journal of Astrophysics and Astronomy

Volume 44, 2023
All articles
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