[en] The International Liquid Mirror Telescope (ILMT) is a 4-m class survey telescope that has recently achieved first light and is expected to swing into full operations by January 1, 2023. It scans the sky in a fixed 22′ wide strip centered at the declination of 29∘21′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 (α), Dec (δ), parallax (π), and proper motions (μα∗ & μδ). 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 Sloan Digital Sky Survey (SDSS) magnitudes that may serve as photometric calibrators. The catalogs generated are stored in an 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dukiya, Naveen; Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital - 263001, India.
Misra, Kuntal; Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital - 263001, India.
Pradhan, Bikram; Indian Space Research Organization (ISRO) Headquarters, Bengaluru, Karnataka, 560094, India
Negi, Vibhore; Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital - 263001, India. ; Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur 273009, India
Ailawadhi, Bhavya; Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital - 263001, India. ; Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur 273009, India
Kumar, Brajesh; Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital - 263001, India.
Hickson, Paul; Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada.
Surdej, Jean ; Space sciences, Technologies and Astrophysics Research (STAR) Institute, Universit ́e de Li`ege, All ́ee du 6 Aoˆut 19c, 4000 Liège, Belgium
Language :
English
Title :
Astrometric and photometric standard candidates for the upcoming 4-m ILMT survey
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