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Astrophysics > Instrumentation and Methods for Astrophysics

arXiv:2311.04712 (astro-ph)
[Submitted on 8 Nov 2023]

Title:Necessity of a TDI optical corrector for ILMT observations

Authors:Vibhore Negi, Bhavya Ailawadhi, Talat Akhunov, Ermanno Borra, Monalisa Dubey, Naveen Dukiya, Jiuyang Fu, Baldeep Grewal, Paul Hickson, Brajesh Kumar, Kuntal Misra, Kumar Pranshu, Ethen Sun, Jean Surdej
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Abstract:The International Liquid Mirror Telescope (ILMT) has recently become operational at the Devasthal Observatory of ARIES, Nainital, India. The ILMT observes in the Time delay integration (TDI) mode where the images are formed by electronically stepping the charges over the pixels of the CCD, along a column. Observations near the zenith impose certain constraints dependent on the latitude such as image deformation due to the star-trail curvature and differential speed. These effects make the stellar trajectories in the focal plane of the ILMT to be hyperbolic, which are corrected for by the introduction of a TDI optical corrector, designed specifically for the ILMT. Here, we report the first results on the effect of this corrector on the trajectories followed by the stars in the ILMT focal plane. Astrometrically calibrating nine nights of data recorded with the ILMT during its first commissioning phase, we find simple (nearly linear) relations between the CCD-y coordinate and the right ascension (RA) of stars and between the CCD-x coordinate and their declination (DEC), respectively, which confirms that the TDI corrector works very fine in converting the stellar trajectories into straight lines.
Comments: 8 pages, 2 figures, 1 table, accepted for publication in the Bulletin of Liège Royal Society of Sciences as a part of 3rd Belgo-Indian Network for Astronomy and Astrophysics (BINA) workshop, 22-24 March 2023
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2311.04712 [astro-ph.IM]
  (or arXiv:2311.04712v1 [astro-ph.IM] for this version)
  https://doi.org/10.48550/arXiv.2311.04712
arXiv-issued DOI via DataCite

Submission history

From: Vibhore Negi [view email]
[v1] Wed, 8 Nov 2023 14:41:26 UTC (1,200 KB)
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