http://arxiv.org/abs/2210.06473
The International Liquid Mirror Telescope (ILMT) is a 4-meter class survey telescope that has recently achieved first light and is expected to swing into full operations by 1st January 2023. It scans the sky in a fixed 22′ wide strip centered at the declination of $+29^o21’41”$ and works in Time Delay Integration (TDI) mode. We present a full catalog of sources in the ILMT strip that can serve as astrometric calibrators. The characteristics of the sources for astrometric calibration are extracted from Gaia EDR3 as it provides a very precise measurement of astrometric properties such as RA ($\alpha$), Dec ($\delta$), parallax ($\pi$), and proper motions ($\mu_{\alpha^{*}}$ & $\mu_{\delta}$). We have crossmatched the Gaia EDR3 with SDSS DR17 and PanSTARRS-1 (PS1) and supplemented the catalog with apparent magnitudes of these sources in g, r, and i filters. We also present a catalog of spectroscopically confirmed white dwarfs with SDSS magnitudes that may serve as photometric calibrators. The catalogs generated are stored in a SQLite database for query-based access. We also report the offsets in equatorial positions compared to Gaia for an astrometrically calibrated TDI frame observed with the ILMT.
N. Dukiya, K. Misra, B. Pradhan, et. al.
Fri, 14 Oct 22
14/75
Comments: Accepted for Publication in Journal of Astronomical Instrumentation; 12 pages + references; 12 figures, 2 tables